A bunch more work on replacing every potential panic with results

src/dynamic_data/flow/choice_queue.rs

@@ -1,7 +1,7 @@
 use crate::dynamic_data::choices::TurnChoice;
 use crate::dynamic_data::script_handling::ScriptSource;
 use crate::dynamic_data::Pokemon;
-use crate::{script_hook, PkmnError, ValueIdentifiable, ValueIdentifier};
+use crate::{script_hook, PkmnError, ValueIdentifiable, ValueIdentifier, VecExt};
 use anyhow::Result;
 use anyhow_ext::anyhow;
 use parking_lot::lock_api::MappedRwLockReadGuard;
@@ -81,9 +81,7 @@ impl ChoiceQueue {
         let len = self.queue.read().len();
         let mut write_lock = self.queue.write();
         for index in self.current..len {
-            let choice = &mut write_lock
+            let choice = &mut write_lock.get_mut_res(index)?;
-                .get_mut(index)
-                .ok_or(PkmnError::IndexOutOfBounds { index, len })?;
             if let Some(choice) = choice {
                 let mut speed = choice.user().boosted_stats().speed();
                 script_hook!(change_speed, (*choice), choice, &mut speed);
@@ -121,14 +119,9 @@ impl ChoiceQueue {
                     return Ok(true);
                 }
 
-                let len = queue_lock.len();
                 // Take the choice we want to move forward out of it's place.
                 let choice = queue_lock
-                    .get_mut(desired_index)
+                    .get_mut_res(desired_index)?
-                    .ok_or(PkmnError::IndexOutOfBounds {
-                        index: self.current,
-                        len,
-                    })?
                     .take()
                     .ok_or(anyhow!("Choice was already taken"))?;
                 // Iterate backwards from the spot before the choice we want to move up, push them all back
@@ -136,15 +129,8 @@ impl ChoiceQueue {
                 for index in (self.current..desired_index).rev() {
                     queue_lock.swap(index, index + 1);
                 }
-                let len = queue_lock.len();
                 // Place the choice that needs to be next in the next to be executed position.
-                let _ = queue_lock
+                let _ = queue_lock.get_mut_res(self.current)?.insert(choice);
-                    .get_mut(self.current)
-                    .ok_or(PkmnError::IndexOutOfBounds {
-                        index: self.current,
-                        len,
-                    })?
-                    .insert(choice);
                 true
             }
             None => false,
@@ -173,13 +159,13 @@ impl ValueIdentifiable for ChoiceQueue {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
 mod tests {
     use super::*;
     use crate::defines::LevelInt;
     use crate::dynamic_data::{DynamicLibrary, PassChoice};
     use crate::static_data::{AbilityIndex, Gender};
     use std::sync::Arc;
-
     #[test]
     fn create_empty_queue() {
         let queue = ChoiceQueue::new(Vec::new());

src/dynamic_data/flow/target_resolver.rs

@@ -7,9 +7,9 @@ use num_traits::abs;
 use crate::dynamic_data::Battle;
 use crate::dynamic_data::Pokemon;
 use crate::static_data::MoveTarget;
-use crate::PkmnError;
+use crate::VecExt;
 
-/// Helper type for the vector of targets we will return.
+/// Helper type for the vector of targ ets we will return.
 pub type TargetList = Vec<Option<Arc<Pokemon>>>;
 
 /// This returns all Pokemon in the battle.
@@ -127,16 +127,7 @@ pub fn resolve_targets(side: u8, index: u8, target: MoveTarget, battle: &Battle)
         // the client deal with what side is passed.
         MoveTarget::AllAlly | MoveTarget::AllOpponent => {
             let mut v = Vec::new();
-            for pokemon in battle
+            for pokemon in battle.sides().get_res(side as usize)?.pokemon().deref() {
-                .sides()
-                .get(side as usize)
-                .ok_or(PkmnError::IndexOutOfBounds {
-                    index: side as usize,
-                    len: battle.sides().len(),
-                })?
-                .pokemon()
-                .deref()
-            {
                 v.push(pokemon.as_ref().cloned());
             }
             v

src/dynamic_data/models/battle.rs

@@ -20,7 +20,7 @@ use crate::dynamic_data::VolatileScriptsOwner;
 use crate::dynamic_data::{is_valid_target, ScriptWrapper};
 use crate::dynamic_data::{ChoiceQueue, ScriptContainer};
 use crate::dynamic_data::{ScriptCategory, ScriptSource, ScriptSourceData};
-use crate::{script_hook, PkmnError, StringKey, ValueIdentifiable, ValueIdentifier};
+use crate::{script_hook, PkmnError, StringKey, ValueIdentifiable, ValueIdentifier, VecExt};
 
 /// A pokemon battle, with any amount of sides and pokemon per side.
 #[derive(Debug)]
@@ -271,13 +271,7 @@ impl Battle {
         let side = choice.user().get_battle_side_index();
         match side {
             Some(side) => {
-                self.sides
+                self.sides.get_res(side as usize)?.set_choice(choice)?;
-                    .get(side as usize)
-                    .ok_or(PkmnError::IndexOutOfBounds {
-                        index: side as usize,
-                        len: self.sides.len(),
-                    })?
-                    .set_choice(choice)?;
                 self.check_choices_set_and_run()?;
                 Ok(true)
             }

src/dynamic_data/models/battle_party.rs

@@ -1,3 +1,4 @@
+use anyhow::Result;
 use std::sync::Arc;
 
 use crate::dynamic_data::models::pokemon::Pokemon;
@@ -19,12 +20,12 @@ pub struct BattleParty {
 impl BattleParty {
     /// Initializes a battle party with the underlying party, and the indices the party is responsible
     /// for.
-    pub fn new(party: Arc<PokemonParty>, responsible_indices: Vec<(u8, u8)>) -> Self {
+    pub fn new(party: Arc<PokemonParty>, responsible_indices: Vec<(u8, u8)>) -> Result<Self> {
-        Self {
+        Ok(Self {
             identifier: Default::default(),
             party,
             responsible_indices,
-        }
+        })
     }
 
     /// Checks whether the party is responsible for the given index.

src/dynamic_data/models/battle_side.rs

@@ -14,7 +14,7 @@ use crate::dynamic_data::script_handling::{ScriptSource, ScriptSourceData, Scrip
 use crate::dynamic_data::Script;
 use crate::dynamic_data::ScriptSet;
 use crate::dynamic_data::VolatileScriptsOwner;
-use crate::{script_hook, PkmnError, StringKey, ValueIdentifiable, ValueIdentifier};
+use crate::{script_hook, StringKey, ValueIdentifiable, ValueIdentifier, VecExt};
 
 /// A side on a battle.
 #[derive(Debug)]
@@ -149,12 +149,7 @@ impl BattleSide {
         for (index, pokemon_slot) in self.pokemon.read().iter().enumerate() {
             if let Some(pokemon) = pokemon_slot {
                 if std::ptr::eq(pokemon.deref(), choice.user().deref()) {
-                    let len = self.choices.read().len();
+                    self.choices.write().get_mut_res(index)?.replace(choice);
-                    self.choices
-                        .write()
-                        .get_mut(index)
-                        .ok_or(PkmnError::IndexOutOfBounds { index, len })?
-                        .replace(choice);
                     self.choices_set.fetch_add(1, Ordering::SeqCst);
                     return Ok(());
                 }
@@ -180,10 +175,7 @@ impl BattleSide {
     pub fn set_pokemon(&self, index: u8, pokemon: Option<Arc<Pokemon>>) -> Result<()> {
         {
             let mut write_lock = self.pokemon.write();
-            let old = write_lock.get_mut(index as usize).ok_or(PkmnError::IndexOutOfBounds {
+            let old = write_lock.get_mut_res(index as usize)?;
-                index: index as usize,
-                len: self.pokemon_per_side as usize,
-            })?;
             let old = match pokemon {
                 Some(pokemon) => old.replace(pokemon),
                 None => old.take(),
@@ -193,23 +185,17 @@ impl BattleSide {
                 // side again.
                 drop(write_lock);
                 script_hook!(on_remove, old_pokemon,);
-                old_pokemon.set_on_battlefield(false);
+                old_pokemon.set_on_battlefield(false)?;
             }
         }
 
         let pokemon = {
             let read_lock = self.pokemon.read();
-            &read_lock
+            &read_lock.get_res(index as usize)?.clone()
-                .get(index as usize)
-                .ok_or(PkmnError::IndexOutOfBounds {
-                    index: index as usize,
-                    len: read_lock.len(),
-                })?
-                .clone()
         };
         if let Some(pokemon) = pokemon {
             pokemon.set_battle_data(self.battle, self.index);
-            pokemon.set_on_battlefield(true);
+            pokemon.set_on_battlefield(true)?;
             pokemon.set_battle_index(index);
 
             let battle = self.battle()?;
@@ -252,11 +238,7 @@ impl BattleSide {
     /// If this happens, the slot can not be used again.
     pub(crate) fn mark_slot_as_unfillable(&self, index: u8) -> Result<()> {
         self.fillable_slots
-            .get(index as usize)
+            .get_res(index as usize)?
-            .ok_or(PkmnError::IndexOutOfBounds {
-                index: index as usize,
-                len: self.fillable_slots.len(),
-            })?
             .store(false, Ordering::SeqCst);
         Ok(())
     }
@@ -266,14 +248,7 @@ impl BattleSide {
         for (i, slot) in self.pokemon.read().iter().enumerate() {
             if let Some(p) = slot {
                 if std::ptr::eq(p.deref().deref(), pokemon.deref()) {
-                    return Ok(self
+                    return Ok(self.fillable_slots.get_res(i)?.load(Ordering::Relaxed));
-                        .fillable_slots
-                        .get(i)
-                        .ok_or(PkmnError::IndexOutOfBounds {
-                            index: i,
-                            len: self.fillable_slots.len(),
-                        })?
-                        .load(Ordering::Relaxed));
                 }
             }
         }

src/dynamic_data/models/pokemon.rs

@@ -22,7 +22,7 @@ use crate::static_data::TypeIdentifier;
 use crate::static_data::{Ability, Statistic};
 use crate::static_data::{ClampedStatisticSet, StatisticSet};
 use crate::utils::Random;
-use crate::{script_hook, PkmnError, StringKey, ValueIdentifiable, ValueIdentifier};
+use crate::{script_hook, PkmnError, StringKey, ValueIdentifiable, ValueIdentifier, VecExt};
 use anyhow::{anyhow, bail, Result};
 
 /// An individual Pokemon as we know and love them.
@@ -595,16 +595,17 @@ impl Pokemon {
     }
 
     /// Sets whether or not the Pokemon is on the battlefield.
-    pub fn set_on_battlefield(&self, value: bool) {
+    pub fn set_on_battlefield(&self, value: bool) -> Result<()> {
         let r = self.battle_data.read();
         if let Some(data) = &mut r.deref() {
             data.on_battle_field.store(value, Ordering::SeqCst);
             if !value {
-                self.volatile.clear();
+                self.volatile.clear()?;
                 self.weight.store(self.form().weight(), Ordering::SeqCst);
                 self.height.store(self.form().height(), Ordering::SeqCst);
             }
         }
+        Ok(())
     }
 
     /// Sets the index of the slot of the side the Pokemon is on.
@@ -676,11 +677,7 @@ impl Pokemon {
                 if !battle.can_slot_be_filled(battle_data.battle_side_index(), battle_data.index()) {
                     battle
                         .sides()
-                        .get(battle_data.battle_side_index() as usize)
+                        .get_res(battle_data.battle_side_index() as usize)?
-                        .ok_or(PkmnError::IndexOutOfBounds {
-                            index: battle_data.battle_side_index() as usize,
-                            len: battle.sides().len(),
-                        })?
                         .mark_slot_as_unfillable(battle_data.index())?;
                 }
 
@@ -721,9 +718,12 @@ impl Pokemon {
     pub fn learn_move(&self, move_name: &StringKey, learn_method: MoveLearnMethod) -> Result<()> {
         let mut learned_moves = self.learned_moves().write();
         let move_pos = learned_moves.iter().position(|a| a.is_none());
-        if move_pos.is_none() {
+        let move_pos = match move_pos {
-            bail!("No more moves with an empty space found.");
+            Some(a) => a,
-        }
+            None => {
+                bail!("No more moves with an empty space found.");
+            }
+        };
         let move_data = self
             .library
             .static_data()
@@ -732,7 +732,9 @@ impl Pokemon {
             .ok_or(PkmnError::InvalidMoveName {
                 move_name: move_name.clone(),
             })?;
-        learned_moves[move_pos.unwrap()] = Some(Arc::new(LearnedMove::new(move_data, learn_method)));
+        learned_moves
+            .get_mut_res(move_pos)?
+            .replace(Arc::new(LearnedMove::new(move_data, learn_method)));
         Ok(())
     }
 
@@ -805,7 +807,10 @@ impl ScriptSource for Pokemon {
         let mut c = 3;
         if let Some(battle_data) = &self.battle_data.read().deref() {
             if let Some(battle) = battle_data.battle() {
-                c += battle.sides()[battle_data.battle_side_index() as usize].get_script_count()?;
+                c += battle
+                    .sides()
+                    .get_res(battle_data.battle_side_index() as usize)?
+                    .get_script_count()?;
             }
         }
         Ok(c)
@@ -826,7 +831,10 @@ impl ScriptSource for Pokemon {
         self.get_own_scripts(scripts);
         if let Some(battle_data) = &self.battle_data.read().deref() {
             if let Some(battle) = battle_data.battle() {
-                battle.sides()[battle_data.battle_side_index() as usize].collect_scripts(scripts)?;
+                battle
+                    .sides()
+                    .get_res(battle_data.battle_side_index() as usize)?
+                    .collect_scripts(scripts)?;
             }
         }
         Ok(())
@@ -862,6 +870,7 @@ pub enum DamageSource {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
 pub mod test {
     use crate::dynamic_data::libraries::test::MockDynamicLibrary;
     use crate::dynamic_data::models::pokemon::Pokemon;

src/dynamic_data/models/pokemon_builder.rs

@@ -5,7 +5,7 @@ use crate::dynamic_data::models::learned_move::MoveLearnMethod;
 use crate::dynamic_data::models::pokemon::Pokemon;
 use crate::dynamic_data::DynamicLibrary;
 use crate::static_data::{AbilityIndex, Gender};
-use crate::{Random, StringKey};
+use crate::{PkmnError, Random, StringKey};
 use anyhow::Result;
 
 /// This allows for the easy chain building of a Pokemon.
@@ -47,7 +47,12 @@ impl PokemonBuilder {
             Random::default()
         };
 
-        let species = self.library.static_data().species().get(&self.species).unwrap();
+        let species = self
+            .library
+            .static_data()
+            .species()
+            .get(&self.species)
+            .ok_or(PkmnError::InvalidSpeciesName { species: self.species })?;
         let form = species.get_default_form();
         let p = Pokemon::new(
             self.library,

src/dynamic_data/models/pokemon_party.rs

@@ -1,9 +1,10 @@
+use anyhow::Result;
 use parking_lot::lock_api::RwLockReadGuard;
 use parking_lot::{RawRwLock, RwLock};
 use std::sync::Arc;
 
 use crate::dynamic_data::models::pokemon::Pokemon;
-use crate::{ValueIdentifiable, ValueIdentifier};
+use crate::{ValueIdentifiable, ValueIdentifier, VecExt};
 
 /// A list of Pokemon belonging to a trainer.
 #[derive(Debug)]
@@ -52,14 +53,17 @@ impl PokemonParty {
     }
 
     /// Sets the Pokemon at an index to a Pokemon, returning the old Pokemon.
-    pub fn swap_into(&self, index: usize, pokemon: Option<Arc<Pokemon>>) -> Option<Arc<Pokemon>> {
+    pub fn swap_into(&self, index: usize, pokemon: Option<Arc<Pokemon>>) -> Result<Option<Arc<Pokemon>>> {
         let mut party = self.pokemon.write();
         if index >= party.len() {
-            return pokemon;
+            return Ok(pokemon);
         }
-        let old = party[index].as_ref().cloned();
+        let value = party.get_mut_res(index)?;
-        party[index] = pokemon;
+        let old = match pokemon {
-        old
+            Some(p) => value.replace(p),
+            None => value.take(),
+        };
+        Ok(old)
     }
 
     /// Whether or not the party still has Pokemon that can be used in battle.
@@ -83,18 +87,18 @@ impl PokemonParty {
     }
 
     /// Makes sure there are no empty spots in the party anymore, leaving the length the same.
-    pub fn pack_party(&self) {
+    pub fn pack_party(&self) -> Result<()> {
         let mut first_empty = None;
         let mut i = 0;
         let mut party = self.pokemon.write();
         loop {
-            if party[i].is_none() {
+            if party.get_res(i)?.is_none() {
                 if first_empty.is_none() {
                     first_empty = Some(i)
                 }
-            } else if first_empty.is_some() {
+            } else if let Some(f) = first_empty {
-                party.swap(first_empty.unwrap(), i);
+                party.swap(f, i);
-                i = first_empty.unwrap();
+                i = f;
                 first_empty = None;
             }
             i += 1;
@@ -102,6 +106,7 @@ impl PokemonParty {
                 break;
             }
         }
+        Ok(())
     }
 
     /// Checks if the party contains a given pokemon.

src/dynamic_data/script_handling/mod.rs

@@ -1,8 +1,9 @@
-use anyhow::Result;
+use anyhow::{anyhow, Result};
 use std::sync::{Arc, Weak};
 
 use parking_lot::RwLock;
 
+use crate::VecExt;
 #[doc(inline)]
 pub use item_script::*;
 #[doc(inline)]
@@ -27,7 +28,7 @@ mod volatile_scripts_owner;
 macro_rules! script_hook {
     ($hook_name: ident, $source: expr, $($parameters: expr),*) => {
         let mut aggregator = $source.get_script_iterator()?;
-        while let Some(script_container) = aggregator.get_next() {
+        while let Some(script_container) = aggregator.get_next()? {
             let script = script_container.get();
             if let Some(script) = script {
                 if let Some(script) = script.read().as_deref() {
@@ -157,16 +158,16 @@ impl ScriptIterator {
     }
 
     /// Move to the next valid value in the scripts.
-    fn increment_to_next_value(&mut self) -> bool {
+    fn increment_to_next_value(&mut self) -> Result<bool> {
         if self.index != -1 {
-            let wrapper = unsafe { &(*self.scripts)[self.index as usize] };
+            let wrapper = unsafe { &(*self.scripts).get_res(self.index as usize)? };
             if let ScriptWrapper::Set(set) = wrapper {
                 if let Some(set) = set.upgrade() {
                     self.set_index += 1;
                     if self.set_index as usize >= set.count() {
                         self.set_index = -1;
                     } else {
-                        return true;
+                        return Ok(true);
                     }
                 }
             }
@@ -175,41 +176,61 @@ impl ScriptIterator {
         let len = (unsafe { &*self.scripts }).len() as i32;
         for index in self.index..len {
             self.index = index;
-            let wrapper = unsafe { &self.scripts.as_ref().unwrap()[self.index as usize] };
+            let wrapper = unsafe {
+                &self
+                    .scripts
+                    .as_ref()
+                    .ok_or(anyhow!("ScriptIterator scripts pointer is null"))?
+                    .get_res(self.index as usize)?
+            };
             if let ScriptWrapper::Set(s) = wrapper {
                 if let Some(set) = s.upgrade() {
                     if set.count() > 0 {
                         self.set_index = 0;
-                        return true;
+                        return Ok(true);
                     }
                 }
             } else if let ScriptWrapper::Script(script) = wrapper {
                 if let Some(v) = script.upgrade() {
                     if let Some(..) = v.read().as_ref() {
-                        return true;
+                        return Ok(true);
                     }
                 }
             }
         }
 
-        false
+        Ok(false)
     }
 
     /// Gets the next valid script. If none is found, returns None.
-    pub fn get_next(&mut self) -> Option<ScriptContainer> {
+    pub fn get_next(&mut self) -> Result<Option<ScriptContainer>> {
-        if !self.increment_to_next_value() {
+        if !self.increment_to_next_value()? {
-            return None;
+            return Ok(None);
         }
         unsafe {
-            return match &self.scripts.as_ref().unwrap()[self.index as usize] {
+            Ok(
-                // increment_to_next_value
+                match &self
-                ScriptWrapper::Script(script) => Some(script.upgrade().unwrap().into()),
+                    .scripts
-                ScriptWrapper::Set(set) => {
+                    .as_ref()
-                    let set = set.upgrade().unwrap();
+                    .ok_or(anyhow!("ScriptIterator scripts pointer is null"))?
-                    let sc = set.at(self.set_index as usize);
+                    .get_res(self.index as usize)?
-                    return Some(sc);
+                {
-                }
+                    // increment_to_next_value
-            };
+                    ScriptWrapper::Script(script) => Some(
+                        script
+                            .upgrade()
+                            .ok_or(anyhow!("Couldn't get a strong reference to a script"))?
+                            .into(),
+                    ),
+                    ScriptWrapper::Set(set) => {
+                        let set = set
+                            .upgrade()
+                            .ok_or(anyhow!("Couldn't get a strong reference to a set"))?;
+                        let sc = set.at(self.set_index as usize)?;
+                        return Ok(Some(sc));
+                    }
+                },
+            )
         }
     }
 
@@ -221,6 +242,7 @@ impl ScriptIterator {
 }
 
 #[cfg(test)]
+#[allow(clippy::unwrap_used)]
 mod tests {
     use std::any::Any;
     use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
@@ -291,10 +313,10 @@ mod tests {
         let script = ScriptContainer::new(Arc::new(TestScript::new()));
         let scripts = vec![ScriptWrapper::from(&script)];
         let mut aggregator = ScriptIterator::new(&scripts as *const Vec<ScriptWrapper>);
-        while let Some(v) = aggregator.get_next() {
+        while let Some(v) = aggregator.get_next().unwrap() {
             v.get().unwrap().read().as_ref().unwrap().stack();
         }
-        let a = script.get_as::<TestScript>();
+        let a = script.get_as::<TestScript>().unwrap();
         assert_eq!(a.test_count.load(Ordering::Relaxed), 1);
     }
 
@@ -305,10 +327,10 @@ mod tests {
         let mut aggregator = ScriptIterator::new(&scripts as *const Vec<ScriptWrapper>);
         for i in 1..11 {
             aggregator.reset();
-            while let Some(v) = aggregator.get_next() {
+            while let Some(v) = aggregator.get_next().unwrap() {
                 v.get().unwrap().read().as_ref().unwrap().stack();
             }
-            let a = script.get_as::<TestScript>();
+            let a = script.get_as::<TestScript>().unwrap();
             assert_eq!(a.test_count.load(Ordering::Relaxed), i);
         }
     }
@@ -324,14 +346,14 @@ mod tests {
             ScriptWrapper::from(&script3),
         ];
         let mut aggregator = ScriptIterator::new(&scripts as *const Vec<ScriptWrapper>);
-        while let Some(v) = aggregator.get_next() {
+        while let Some(v) = aggregator.get_next().unwrap() {
             v.get().unwrap().read().as_ref().unwrap().stack();
         }
-        let a = script1.get_as::<TestScript>();
+        let a = script1.get_as::<TestScript>().unwrap();
         assert_eq!(a.test_count.load(Ordering::Relaxed), 1);
-        let a = script2.get_as::<TestScript>();
+        let a = script2.get_as::<TestScript>().unwrap();
         assert_eq!(a.test_count.load(Ordering::Relaxed), 1);
-        let a = script3.get_as::<TestScript>();
+        let a = script3.get_as::<TestScript>().unwrap();
         assert_eq!(a.test_count.load(Ordering::Relaxed), 1);
     }
 
@@ -348,14 +370,14 @@ mod tests {
         let mut aggregator = ScriptIterator::new(&scripts as *const Vec<ScriptWrapper>);
         for i in 1..11 {
             aggregator.reset();
-            while let Some(v) = aggregator.get_next() {
+            while let Some(v) = aggregator.get_next().unwrap() {
                 v.get().unwrap().read().as_ref().unwrap().stack();
             }
-            let a = script1.get_as::<TestScript>();
+            let a = script1.get_as::<TestScript>().unwrap();
             assert_eq!(a.test_count.load(Ordering::Relaxed), i);
-            let a = script2.get_as::<TestScript>();
+            let a = script2.get_as::<TestScript>().unwrap();
             assert_eq!(a.test_count.load(Ordering::Relaxed), i);
-            let a = script3.get_as::<TestScript>();
+            let a = script3.get_as::<TestScript>().unwrap();
             assert_eq!(a.test_count.load(Ordering::Relaxed), i);
         }
     }
@@ -371,19 +393,19 @@ mod tests {
         let mut aggregator = ScriptIterator::new(&scripts as *const Vec<ScriptWrapper>);
         for i in 1..11 {
             aggregator.reset();
-            while let Some(v) = aggregator.get_next() {
+            while let Some(v) = aggregator.get_next().unwrap() {
                 v.get().unwrap().read().as_ref().unwrap().stack();
             }
-            let s = set.at(0);
+            let s = set.at(0).unwrap();
-            let s = s.get_as::<TestScript>();
+            let s = s.get_as::<TestScript>().unwrap();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_a");
-            let s = set.at(1);
+            let s = set.at(1).unwrap();
-            let s = s.get_as::<TestScript>();
+            let s = s.get_as::<TestScript>().unwrap();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_b");
-            let s = set.at(2);
+            let s = set.at(2).unwrap();
-            let s = s.get_as::<TestScript>();
+            let s = s.get_as::<TestScript>().unwrap();
             assert_eq!(s.test_count.load(Ordering::Relaxed), i);
             assert_eq!(s.name().str(), "test_c");
         }
@@ -402,6 +424,7 @@ mod tests {
             aggregator
                 .get_next()
                 .unwrap()
+                .unwrap()
                 .get()
                 .unwrap()
                 .read()
@@ -415,6 +438,7 @@ mod tests {
             aggregator
                 .get_next()
                 .unwrap()
+                .unwrap()
                 .get()
                 .unwrap()
                 .read()
@@ -425,8 +449,8 @@ mod tests {
             "test_b"
         );
 
-        set.remove(&"test_c".into());
+        set.remove(&"test_c".into()).unwrap();
-        assert!(aggregator.get_next().is_none());
+        assert!(aggregator.get_next().unwrap().is_none());
     }
 
     #[test]
@@ -442,6 +466,7 @@ mod tests {
             aggregator
                 .get_next()
                 .unwrap()
+                .unwrap()
                 .get()
                 .unwrap()
                 .read()
@@ -452,12 +477,13 @@ mod tests {
             "test_a"
         );
 
-        set.remove(&"test_b".into());
+        set.remove(&"test_b".into()).unwrap();
 
         assert_eq!(
             aggregator
                 .get_next()
                 .unwrap()
+                .unwrap()
                 .get()
                 .unwrap()
                 .read()
@@ -467,7 +493,7 @@ mod tests {
                 .str(),
             "test_c"
         );
-        assert!(aggregator.get_next().is_none());
+        assert!(aggregator.get_next().unwrap().is_none());
     }
 
     pub struct TestScriptSource {
@@ -503,10 +529,10 @@ mod tests {
 
         let mut aggregator = source.get_script_iterator().unwrap();
         aggregator.reset();
-        assert!(aggregator.get_next().is_none());
+        assert!(aggregator.get_next().unwrap().is_none());
         aggregator.reset();
         source.script.set(Arc::new(TestScript::new()));
-        assert!(aggregator.get_next().is_some());
+        assert!(aggregator.get_next().unwrap().is_some());
     }
 
     #[test]
@@ -518,9 +544,9 @@ mod tests {
 
         let mut aggregator = source.get_script_iterator().unwrap();
         source.script.set(Arc::new(TestScript::new()));
-        assert!(aggregator.get_next().is_some());
+        assert!(aggregator.get_next().unwrap().is_some());
         aggregator.reset();
         source.script.clear();
-        assert!(aggregator.get_next().is_none());
+        assert!(aggregator.get_next().unwrap().is_none());
     }
 }

src/dynamic_data/script_handling/script.rs

@@ -1,3 +1,4 @@
+use anyhow::{anyhow, Result};
 use std::any::Any;
 use std::fmt::{Debug, Formatter};
 use std::ops::Deref;
@@ -355,12 +356,16 @@ impl ScriptContainer {
     }
 
     /// Get the underlying script as the downcasted value.
-    pub fn get_as<T: 'static>(&self) -> MappedRwLockReadGuard<T> {
+    pub fn get_as<T: 'static>(&self) -> Result<MappedRwLockReadGuard<T>> {
-        RwLockReadGuard::map(self.script.read(), |a| unsafe {
+        let r = RwLockReadGuard::try_map(self.script.read(), |a| unsafe {
-            let ptr = a.as_ref().as_ref().unwrap().as_ref() as *const dyn Script;
+            let ptr = a.as_ref().as_ref()?.as_ref() as *const dyn Script;
-            let any = ptr.as_ref().unwrap().as_any();
+            let any = ptr.as_ref()?.as_any();
-            any.downcast_ref::<T>().unwrap()
+            any.downcast_ref::<T>()
-        })
+        });
+        match r {
+            Ok(a) => Ok(a),
+            Err(_) => Err(anyhow!("Could not downcast script to requested type")),
+        }
     }
 }
 

src/dynamic_data/script_handling/script_set.rs

@@ -6,7 +6,7 @@ use indexmap::IndexMap;
 use parking_lot::RwLock;
 
 use crate::dynamic_data::script_handling::script::{Script, ScriptContainer};
-use crate::StringKey;
+use crate::{PkmnError, StringKey};
 
 /// A collection of unique scripts.
 #[derive(Debug, Default)]
@@ -29,10 +29,12 @@ impl ScriptSet {
                 }
             }
         }
-        self.scripts
+
-            .write()
+        // If the existing script does not exist, or is not a script, we can just add the new one.
-            .insert(script.name().clone(), ScriptContainer::new(script));
+        let name = script.name().clone();
-        self.scripts.read().last().unwrap().1.clone()
+        let container = ScriptContainer::new(script);
+        self.scripts.write().insert(name, container.clone());
+        container
     }
 
     /// Adds a script with a name to the set. If the script with that name already exists in this
@@ -54,8 +56,8 @@ impl ScriptSet {
         if let Some(script) = script {
             let name = script.name().clone();
             let arc = ScriptContainer::new(script);
-            self.scripts.write().insert(name, arc);
+            self.scripts.write().insert(name, arc.clone());
-            Ok(Some(self.scripts.read().last().unwrap().1.clone()))
+            Ok(Some(arc))
         } else {
             Ok(None)
         }
@@ -67,27 +69,34 @@ impl ScriptSet {
     }
 
     /// Removes a script from the set using its unique name.
-    pub fn remove(&self, key: &StringKey) {
+    pub fn remove(&self, key: &StringKey) -> Result<()> {
         let value = self.scripts.write().shift_remove(key);
         if let Some(script) = value {
             if let Some(script) = script.get() {
                 let script = script.read();
-                script.as_ref().unwrap().on_remove();
+                script.as_ref().ok_or(PkmnError::UnableToAcquireLock)?.on_remove();
-                script.as_ref().unwrap().mark_for_deletion();
+                script
+                    .as_ref()
+                    .ok_or(PkmnError::UnableToAcquireLock)?
+                    .mark_for_deletion();
             }
         }
+        Ok(())
     }
 
     /// Clears all scripts from the set.
-    pub fn clear(&self) {
+    pub fn clear(&self) -> Result<()> {
         for script in self.scripts.read().deref() {
             if let Some(script) = script.1.get() {
                 let script = script.read();
-                script.as_ref().unwrap().on_remove();
+                if let Some(script) = &*script {
-                script.as_ref().unwrap().mark_for_deletion();
+                    script.on_remove();
+                    script.mark_for_deletion();
+                }
             }
         }
         self.scripts.write().clear();
+        Ok(())
     }
 
     /// Checks if the set has a script with the given name.
@@ -96,8 +105,17 @@ impl ScriptSet {
     }
 
     /// Gets a script from the set at a specific index.
-    pub fn at(&self, index: usize) -> ScriptContainer {
+    pub fn at(&self, index: usize) -> Result<ScriptContainer> {
-        self.scripts.read()[index].clone()
+        Ok(self
+            .scripts
+            .read()
+            .get_index(index)
+            .ok_or(PkmnError::IndexOutOfBounds {
+                index,
+                len: self.scripts.read().len(),
+            })?
+            .1
+            .clone())
     }
 
     /// Gets the number of scripts in the set.

src/dynamic_data/script_handling/volatile_scripts_owner.rs

@@ -35,7 +35,7 @@ pub trait VolatileScriptsOwner {
     }
 
     /// Removes a volatile script by name.
-    fn remove_volatile_script(&self, key: &StringKey) {
+    fn remove_volatile_script(&self, key: &StringKey) -> Result<()> {
         self.volatile_scripts().remove(key)
     }
 }

src/ffi/dynamic_data/choices.rs

@@ -1,5 +1,6 @@
 use crate::dynamic_data::{FleeChoice, LearnedMove, MoveChoice, PassChoice, Pokemon, TurnChoice};
-use crate::ffi::{ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
+use anyhow::anyhow;
 use std::ptr::drop_in_place;
 use std::sync::Arc;
 
@@ -57,38 +58,38 @@ extern "C" fn turn_choice_move_new(
 #[no_mangle]
 extern "C" fn turn_choice_move_learned_move(
     choice: ExternPointer<TurnChoice>,
-) -> IdentifiablePointer<Arc<LearnedMove>> {
+) -> NativeResult<IdentifiablePointer<Arc<LearnedMove>>> {
     if let TurnChoice::Move(c) = choice.as_ref() {
-        return c.used_move().clone().into();
+        return NativeResult::ok(c.used_move().clone().into());
     }
-    panic!("Turn choice was not a learned move");
+    NativeResult::err(anyhow!("Turn choice was not a learned move"))
 }
 
 /// The target side the move is aimed at.
 #[no_mangle]
-extern "C" fn turn_choice_move_target_side(choice: ExternPointer<TurnChoice>) -> u8 {
+extern "C" fn turn_choice_move_target_side(choice: ExternPointer<TurnChoice>) -> NativeResult<u8> {
     if let TurnChoice::Move(c) = choice.as_ref() {
-        return c.target_side();
+        return NativeResult::ok(c.target_side());
     }
-    panic!("Turn choice was not a learned move");
+    NativeResult::err(anyhow!("Turn choice was not a learned move"))
 }
 
 /// The Pokemon index on the side we're aiming at.
 #[no_mangle]
-extern "C" fn turn_choice_move_target_index(choice: ExternPointer<TurnChoice>) -> u8 {
+extern "C" fn turn_choice_move_target_index(choice: ExternPointer<TurnChoice>) -> NativeResult<u8> {
     if let TurnChoice::Move(c) = choice.as_ref() {
-        return c.target_index();
+        return NativeResult::ok(c.target_index());
     }
-    panic!("Turn choice was not a learned move");
+    NativeResult::err(anyhow!("Turn choice was not a learned move"))
 }
 
 /// The priority of the move choice at the beginning of the turn.
 #[no_mangle]
-extern "C" fn turn_choice_move_priority(choice: ExternPointer<TurnChoice>) -> i8 {
+extern "C" fn turn_choice_move_priority(choice: ExternPointer<TurnChoice>) -> NativeResult<i8> {
     if let TurnChoice::Move(c) = choice.as_ref() {
-        return c.priority();
+        return NativeResult::ok(c.priority());
     }
-    panic!("Turn choice was not a learned move");
+    NativeResult::err(anyhow!("Turn choice was not a learned move"))
 }
 
 /// Creates a new Turn Choice for the user to flee.

src/ffi/dynamic_data/models/battle.rs

@@ -3,6 +3,7 @@ use crate::dynamic_data::{
 };
 use crate::ffi::dynamic_data::models::native_event_hook::NativeEventHook;
 use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
+use anyhow::anyhow;
 use std::ffi::{c_char, CStr, CString};
 use std::sync::Arc;
 
@@ -178,14 +179,12 @@ extern "C" fn battle_can_use(ptr: ExternPointer<Arc<Battle>>, choice: ExternPoin
 /// Checks to see whether all Pokemon on the field have set their choices. If so, we then run
 /// the turn.
 #[no_mangle]
-extern "C" fn battle_try_set_choice(ptr: ExternPointer<Arc<Battle>>, choice: OwnedPtr<TurnChoice>) -> u8 {
+extern "C" fn battle_try_set_choice(ptr: ExternPointer<Arc<Battle>>, choice: OwnedPtr<TurnChoice>) -> NativeResult<u8> {
     let choice = unsafe { choice.read() };
     let result = ptr.as_ref().try_set_choice(choice);
     match result {
-        Ok(b) => u8::from(b),
+        Ok(b) => NativeResult::ok(u8::from(b)),
-        Err(e) => {
+        Err(e) => NativeResult::err(e),
-            panic!("Encountered error: {}", e)
-        }
     }
 }
 
@@ -203,7 +202,10 @@ extern "C" fn battle_set_weather(ptr: ExternPointer<Arc<Battle>>, weather: *cons
 #[no_mangle]
 extern "C" fn battle_weather_name(ptr: ExternPointer<Arc<Battle>>) -> NativeResult<*mut c_char> {
     match ptr.as_ref().weather_name() {
-        Ok(Some(w)) => CString::new(w.str()).unwrap().into_raw().into(),
+        Ok(Some(w)) => match CString::new(w.str()) {
+            Ok(s) => s.into_raw().into(),
+            Err(e) => NativeResult::err(anyhow!("Failed to convert weather name to CString: {}", e)),
+        },
         Ok(None) => std::ptr::null_mut::<c_char>().into(),
         Err(e) => NativeResult::err(e),
     }

src/ffi/dynamic_data/models/battle_party.rs

@@ -1,5 +1,7 @@
 use crate::dynamic_data::{BattleParty, Pokemon, PokemonParty};
-use crate::ffi::{ExternPointer, IdentifiablePointer};
+use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult};
+use crate::VecExt;
+use anyhow::{anyhow, Result};
 use std::sync::Arc;
 
 /// A battle party is a wrapper around a party, with the indices for which the party is responsible
@@ -9,18 +11,34 @@ extern "C" fn battle_party_new(
     party: ExternPointer<Arc<PokemonParty>>,
     responsible_indices_ptr: *const u8,
     responsible_indices_length: usize,
-) -> IdentifiablePointer<Arc<BattleParty>> {
+) -> NativeResult<IdentifiablePointer<Arc<BattleParty>>> {
-    if responsible_indices_length % 2 == 1 {
+    if responsible_indices_length % 2 != 0 {
-        panic!("The length of responsible indices should be dividable by two");
+        return NativeResult::err(anyhow!("The length of responsible indices should be dividable by two"));
     }
+
     let responsible_indices_slice =
         unsafe { std::slice::from_raw_parts(responsible_indices_ptr, responsible_indices_length) };
     let mut responsible_indices: Vec<(u8, u8)> = Vec::with_capacity(responsible_indices_length / 2);
+
+    let mut split = |i| -> Result<()> {
+        *responsible_indices.get_mut_res(i)? = (
+            *responsible_indices_slice.get_res(i * 2)?,
+            *responsible_indices_slice.get_res(i * 2 + 1)?,
+        );
+        Ok(())
+    };
+
     for i in 0..responsible_indices_length / 2 {
-        responsible_indices[i] = (responsible_indices_slice[i * 2], responsible_indices_slice[i * 2 + 1])
+        match split(i) {
+            Ok(_) => (),
+            Err(e) => return NativeResult::err(e),
+        }
     }
 
-    Arc::new(BattleParty::new(party.as_ref().clone(), responsible_indices)).into()
+    match BattleParty::new(party.as_ref().clone(), responsible_indices) {
+        Ok(v) => NativeResult::ok(Arc::new(v).into()),
+        Err(e) => NativeResult::err(e),
+    }
 }
 
 /// Checks whether the party is responsible for the given index.

src/ffi/dynamic_data/models/pokemon.rs

@@ -4,6 +4,7 @@ use crate::ffi::{ffi_arc_getter, ffi_vec_value_getters, ExternPointer, Identifia
 use crate::static_data::{
     Ability, AbilityIndex, Form, Gender, Item, Nature, Species, Statistic, StatisticSet, TypeIdentifier,
 };
+use anyhow::anyhow;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 use std::sync::Arc;
@@ -141,12 +142,15 @@ ffi_arc_getter!(Pokemon, height, f32);
 
 /// An optional nickname of the Pokemon.
 #[no_mangle]
-extern "C" fn pokemon_nickname(ptr: ExternPointer<Arc<Pokemon>>) -> *mut c_char {
+extern "C" fn pokemon_nickname(ptr: ExternPointer<Arc<Pokemon>>) -> NativeResult<*mut c_char> {
     let name = ptr.as_ref().nickname();
     if let Some(v) = name {
-        CString::new(v.as_str()).unwrap().into_raw()
+        match CString::new(v.as_str()) {
+            Ok(v) => NativeResult::ok(v.into_raw()),
+            Err(err) => NativeResult::err(anyhow!("Could not convert nickname to CString: {}", err)),
+        }
     } else {
-        std::ptr::null_mut()
+        NativeResult::ok(std::ptr::null_mut())
     }
 }
 

src/ffi/dynamic_data/models/pokemon_party.rs

@@ -1,5 +1,5 @@
 use crate::dynamic_data::{Pokemon, PokemonParty};
-use crate::ffi::{ExternPointer, IdentifiablePointer};
+use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult};
 use std::sync::Arc;
 
 /// Instantiates a party with a set size.
@@ -33,16 +33,16 @@ extern "C" fn pokemon_party_swap_into(
     ptr: ExternPointer<Arc<PokemonParty>>,
     index: usize,
     pokemon: ExternPointer<Arc<Pokemon>>,
-) -> IdentifiablePointer<Arc<Pokemon>> {
+) -> NativeResult<IdentifiablePointer<Arc<Pokemon>>> {
     let pokemon = if pokemon.ptr.is_null() {
         None
     } else {
         Some(pokemon.as_ref().clone())
     };
-    if let Some(v) = ptr.as_ref().swap_into(index, pokemon) {
+    match ptr.as_ref().swap_into(index, pokemon) {
-        v.into()
+        Ok(Some(v)) => NativeResult::ok(v.into()),
-    } else {
+        Ok(None) => NativeResult::ok(IdentifiablePointer::none()),
-        IdentifiablePointer::none()
+        Err(e) => NativeResult::err(e),
     }
 }
 
@@ -60,8 +60,8 @@ extern "C" fn pokemon_party_length(ptr: ExternPointer<Arc<PokemonParty>>) -> usi
 
 /// Makes sure there are no empty spots in the party anymore, leaving the length the same.
 #[no_mangle]
-extern "C" fn pokemon_party_pack_party(ptr: ExternPointer<Arc<PokemonParty>>) {
+extern "C" fn pokemon_party_pack_party(ptr: ExternPointer<Arc<PokemonParty>>) -> NativeResult<()> {
-    ptr.as_ref().pack_party()
+    ptr.as_ref().pack_party().into()
 }
 
 /// Checks if the party contains a given pokemon.

src/ffi/mod.rs

@@ -106,6 +106,7 @@ pub(self) struct ExternPointer<T: ?Sized> {
 
 impl<T: ?Sized> ExternPointer<T> {
     /// Get the internal pointer as reference.
+    #[allow(clippy::panic)] // We currently allow this as these should never be null, but we might want to change this in the future.
     pub(self) fn as_ref(&self) -> &T {
         unsafe {
             self.ptr
@@ -114,6 +115,7 @@ impl<T: ?Sized> ExternPointer<T> {
         }
     }
     /// Get the internal pointer as mutable reference.
+    #[allow(clippy::panic)] // We currently allow this as these should never be null, but we might want to change this in the future.
     pub(self) fn as_mut(&mut self) -> &mut T {
         unsafe {
             self.ptr
@@ -241,6 +243,7 @@ impl<T: ValueIdentifiable> From<Box<T>> for IdentifiablePointer<T> {
 }
 
 impl<T: ValueIdentifiable> From<*const T> for IdentifiablePointer<T> {
+    #[allow(clippy::unwrap_used)] // We currently allow this as these should never be null, but we might want to change this in the future.
     fn from(v: *const T) -> Self {
         let id = unsafe { transmute(v.as_ref().unwrap().value_identifier()) };
         Self { ptr: v, id }
@@ -284,7 +287,8 @@ impl<T: Copy> NativeResult<T> {
         }
     }
     /// Creates a new NativeResult with the given error.
-    pub fn err(err: anyhow::Error) -> Self {
+    #[allow(clippy::unwrap_used)] // We know for certain this is not empty.
+    pub fn err(err: anyhow_ext::Error) -> Self {
         Self {
             ok: 0,
             value: ResultUnion {
@@ -292,6 +296,17 @@ impl<T: Copy> NativeResult<T> {
             },
         }
     }
+
+    /// Creates a new NativeResult with the given error string.
+    #[allow(clippy::unwrap_used)] // We know for certain this is not empty.
+    pub fn err_from_str(err: &str) -> Self {
+        Self {
+            ok: 0,
+            value: ResultUnion {
+                err: CString::new(err).unwrap().into_raw(),
+            },
+        }
+    }
 }
 
 impl<T: Copy> From<anyhow::Result<T>> for NativeResult<T> {

src/ffi/static_data/ability.rs

@@ -1,6 +1,7 @@
-use crate::ffi::{ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::{Ability, AbilityImpl, EffectParameter};
 use crate::StringKey;
+use anyhow::anyhow;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 use std::sync::Arc;
@@ -12,18 +13,24 @@ unsafe extern "C" fn ability_new(
     effect: *const c_char,
     parameters: *const OwnedPtr<EffectParameter>,
     parameters_length: usize,
-) -> IdentifiablePointer<Arc<dyn Ability>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn Ability>>> {
     let parameters = std::slice::from_raw_parts(parameters, parameters_length);
     let mut parameters_vec: Vec<EffectParameter> = Vec::with_capacity(parameters_length);
     for parameter in parameters {
         parameters_vec.push(*Box::from_raw(*parameter));
     }
 
-    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let name: StringKey = match CStr::from_ptr(name).to_str() {
-    let effect: StringKey = CStr::from_ptr(effect).to_str().unwrap().into();
+        Ok(s) => s.into(),
+        Err(_) => return NativeResult::err(anyhow!("Failed to convert name to CStr")),
+    };
+    let effect: StringKey = match CStr::from_ptr(effect).to_str() {
+        Ok(s) => s.into(),
+        Err(_) => return NativeResult::err(anyhow!("Failed to convert effect to CStr")),
+    };
 
     let arc: Arc<dyn Ability> = Arc::new(AbilityImpl::new(&name, &effect, parameters_vec));
-    arc.into()
+    NativeResult::ok(arc.into())
 }
 
 /// Drops a reference counted ability.
@@ -34,14 +41,20 @@ unsafe extern "C" fn ability_drop(ptr: OwnedPtr<Arc<dyn Ability>>) {
 
 /// The name of the ability.
 #[no_mangle]
-unsafe extern "C" fn ability_name(ptr: ExternPointer<Arc<dyn Ability>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn ability_name(ptr: ExternPointer<Arc<dyn Ability>>) -> NativeResult<OwnedPtr<c_char>> {
-    CString::new(ptr.as_ref().name().str()).unwrap().into_raw()
+    match CString::new(ptr.as_ref().name().str()) {
+        Ok(s) => NativeResult::ok(s.into_raw()),
+        Err(_) => NativeResult::err(anyhow!("Failed to convert name to CString")),
+    }
 }
 
 /// The name of the script effect of the ability.
 #[no_mangle]
-unsafe extern "C" fn ability_effect(ptr: ExternPointer<Arc<dyn Ability>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn ability_effect(ptr: ExternPointer<Arc<dyn Ability>>) -> NativeResult<OwnedPtr<c_char>> {
-    CString::new(ptr.as_ref().effect().str()).unwrap().into_raw()
+    match CString::new(ptr.as_ref().effect().str()) {
+        Ok(s) => NativeResult::ok(s.into_raw()),
+        Err(_) => NativeResult::err(anyhow!("Failed to convert effect to CString")),
+    }
 }
 
 /// The length of the parameters for the script effect of the ability.

src/ffi/static_data/form.rs

@@ -1,9 +1,10 @@
 use crate::ffi::{
     ffi_arc_dyn_getter, ffi_vec_stringkey_getters, ffi_vec_value_getters, BorrowedPtr, ExternPointer,
-    IdentifiablePointer, OwnedPtr,
+    IdentifiablePointer, NativeResult, OwnedPtr,
 };
 use crate::static_data::{Form, FormImpl, LearnableMoves, StaticStatisticSet, TypeIdentifier};
 use crate::StringKey;
+use anyhow::anyhow;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
@@ -26,8 +27,11 @@ unsafe extern "C" fn form_new(
     moves: OwnedPtr<Box<dyn LearnableMoves>>,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<dyn Form>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn Form>>> {
-    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let name: StringKey = match CStr::from_ptr(name).to_str() {
+        Ok(name) => name.into(),
+        Err(_) => return NativeResult::err(anyhow!("Unable to convert name to string")),
+    };
 
     let abilities = std::slice::from_raw_parts(abilities, abilities_length);
     let mut abilities_vec = Vec::with_capacity(abilities_length);
@@ -43,7 +47,11 @@ unsafe extern "C" fn form_new(
     let flags = std::slice::from_raw_parts(flags, flags_length);
     let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
     for flag in flags {
-        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+        let flag = match CStr::from_ptr(*flag).to_str() {
+            Ok(flag) => flag,
+            Err(_) => return NativeResult::err(anyhow!("Unable to convert flag to string")),
+        };
+        flags_set.insert(flag.into());
     }
 
     let a: Arc<dyn Form> = Arc::new(FormImpl::new(
@@ -58,7 +66,7 @@ unsafe extern "C" fn form_new(
         *Box::from_raw(moves),
         flags_set,
     ));
-    a.into()
+    NativeResult::ok(a.into())
 }
 
 /// Drops a reference count for a form.
@@ -69,9 +77,12 @@ unsafe extern "C" fn form_drop(ptr: OwnedPtr<Arc<dyn Form>>) {
 
 /// The name of the form.
 #[no_mangle]
-unsafe extern "C" fn form_name(ptr: ExternPointer<Arc<dyn Form>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn form_name(ptr: ExternPointer<Arc<dyn Form>>) -> NativeResult<OwnedPtr<c_char>> {
     let name = ptr.as_ref().name();
-    CString::new(name.str()).unwrap().into_raw()
+    match CString::new(name.str()) {
+        Ok(name) => NativeResult::ok(name.into_raw()),
+        Err(_) => NativeResult::err(anyhow!("Unable to convert name `{}` to CString", name.str())),
+    }
 }
 
 ffi_arc_dyn_getter!(Form, height, f32);

src/ffi/static_data/item.rs

@@ -1,6 +1,7 @@
-use crate::ffi::{ffi_arc_dyn_getter, ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{ffi_arc_dyn_getter, ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::{BattleItemCategory, Item, ItemCategory, ItemImpl};
 use crate::StringKey;
+use anyhow::anyhow;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
@@ -15,16 +16,23 @@ unsafe extern "C" fn item_new(
     price: i32,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<dyn Item>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn Item>>> {
     let flags = std::slice::from_raw_parts(flags, flags_length);
-    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let name: StringKey = match CStr::from_ptr(name).to_str() {
+        Ok(name) => name.into(),
+        Err(_) => return NativeResult::err(anyhow!("Unable to convert name to string")),
+    };
     let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
     for flag in flags {
-        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+        let flag = match CStr::from_ptr(*flag).to_str() {
+            Ok(flag) => flag,
+            Err(_) => return NativeResult::err(anyhow!("Unable to convert flag to string")),
+        };
+        flags_set.insert(flag.into());
     }
 
     let item: Arc<dyn Item> = Arc::new(ItemImpl::new(&name, category, battle_category, price, flags_set));
-    item.into()
+    NativeResult::ok(item.into())
 }
 
 /// Drops a reference counted item.
@@ -35,9 +43,12 @@ unsafe extern "C" fn item_drop(ptr: OwnedPtr<Arc<dyn Item>>) {
 
 /// The name of the item.
 #[no_mangle]
-unsafe extern "C" fn item_name(ptr: ExternPointer<Arc<dyn Item>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn item_name(ptr: ExternPointer<Arc<dyn Item>>) -> NativeResult<OwnedPtr<c_char>> {
     let name = ptr.as_ref().name();
-    CString::new(name.str()).unwrap().into_raw()
+    match CString::new(name.str()) {
+        Ok(name) => NativeResult::ok(name.into_raw()),
+        Err(_) => NativeResult::err(anyhow!("Unable to convert name `{}` to CString", name.str())),
+    }
 }
 
 ffi_arc_dyn_getter!(Item, category, ItemCategory);

src/ffi/static_data/libraries/nature_library.rs

@@ -1,6 +1,7 @@
-use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::{Nature, NatureLibrary, NatureLibraryImpl};
-use crate::Random;
+use crate::{PkmnError, Random};
+use anyhow::anyhow;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 use std::sync::Arc;
@@ -24,9 +25,15 @@ unsafe extern "C" fn nature_library_load_nature(
     mut ptr: ExternPointer<Box<dyn NatureLibrary>>,
     name: BorrowedPtr<c_char>,
     nature: OwnedPtr<Arc<dyn Nature>>,
-) {
+) -> NativeResult<()> {
-    ptr.as_mut()
+    let nature = nature.as_ref().ok_or(PkmnError::NullReference);
-        .load_nature(CStr::from_ptr(name).into(), nature.as_ref().unwrap().clone())
+    match nature {
+        Ok(nature) => {
+            ptr.as_mut().load_nature(CStr::from_ptr(name).into(), nature.clone());
+            NativeResult::ok(())
+        }
+        Err(e) => NativeResult::err(e.into()),
+    }
 }
 
 /// Gets a nature by name.
@@ -57,8 +64,15 @@ unsafe extern "C" fn nature_library_get_random_nature(
 unsafe extern "C" fn nature_library_get_nature_name(
     ptr: ExternPointer<Box<dyn NatureLibrary>>,
     nature: BorrowedPtr<Arc<dyn Nature>>,
-) -> OwnedPtr<c_char> {
+) -> NativeResult<OwnedPtr<c_char>> {
-    CString::new(ptr.as_ref().get_nature_name(nature.as_ref().unwrap()).str())
+    match nature.as_ref() {
-        .unwrap()
+        Some(nature) => {
-        .into_raw()
+            let name = ptr.as_ref().get_nature_name(nature);
+            match CString::new(name.str()) {
+                Ok(cstr) => NativeResult::ok(cstr.into_raw()),
+                Err(_) => NativeResult::err(anyhow!("Failed to convert nature name to C string")),
+            }
+        }
+        None => NativeResult::err(PkmnError::NullReference.into()),
+    }
 }

src/ffi/static_data/libraries/type_library.rs

@@ -1,4 +1,4 @@
-use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{BorrowedPtr, ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::{TypeIdentifier, TypeLibrary, TypeLibraryImpl};
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
@@ -38,13 +38,17 @@ unsafe extern "C" fn type_library_get_type_name(
     ptr: ExternPointer<Box<dyn TypeLibrary>>,
     type_id: TypeIdentifier,
     found: *mut bool,
-) -> *mut c_char {
+) -> NativeResult<*mut c_char> {
     if let Some(v) = ptr.as_ref().get_type_name(type_id) {
         *found = true;
-        CString::new(v.str()).unwrap().into_raw()
+
+        match CString::new(v.str()) {
+            Ok(v) => NativeResult::ok(v.into_raw()),
+            Err(e) => NativeResult::err(e.into()),
+        }
     } else {
         *found = false;
-        std::ptr::null_mut()
+        NativeResult::ok(std::ptr::null_mut())
     }
 }
 

src/ffi/static_data/mod.rs

@@ -1,6 +1,7 @@
-use crate::ffi::{ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::EffectParameter;
-use crate::StringKey;
+use crate::{PkmnError, StringKey};
+use anyhow::anyhow;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
 
@@ -45,9 +46,14 @@ extern "C" fn effect_parameter_new_float(value: f32) -> IdentifiablePointer<Effe
 
 /// Instantiates an effect parameter with a string.
 #[no_mangle]
-unsafe extern "C" fn effect_parameter_new_string(value: *const c_char) -> IdentifiablePointer<EffectParameter> {
+unsafe extern "C" fn effect_parameter_new_string(
-    let sk: StringKey = CStr::from_ptr(value).to_str().unwrap().into();
+    value: *const c_char,
-    Box::<EffectParameter>::new(sk.into()).into()
+) -> NativeResult<IdentifiablePointer<EffectParameter>> {
+    let sk: StringKey = match CStr::from_ptr(value).to_str() {
+        Ok(sk) => sk.into(),
+        Err(_) => return NativeResult::err(PkmnError::InvalidCString.into()),
+    };
+    NativeResult::ok(Box::<EffectParameter>::new(sk.into()).into())
 }
 
 /// Drop an effect parameter.
@@ -69,40 +75,47 @@ extern "C" fn effect_parameter_get_type(ptr: ExternPointer<EffectParameter>) ->
 
 /// Get the boolean contained in the effect parameter, panics if the effect parameter is not a bool.
 #[no_mangle]
-extern "C" fn effect_parameter_get_as_bool(ptr: ExternPointer<EffectParameter>) -> u8 {
+extern "C" fn effect_parameter_get_as_bool(ptr: ExternPointer<EffectParameter>) -> NativeResult<u8> {
     let p = ptr.as_ref();
     if let EffectParameter::Bool(_, b) = p {
-        return u8::from(*b);
+        NativeResult::ok(u8::from(*b))
+    } else {
+        NativeResult::err(anyhow!("Unexpected effect parameter. Expected bool, was: {}", p))
     }
-    panic!("Unexpected effect parameter. Expected bool, was: {}", p);
 }
 
 /// Get the int contained in the effect parameter, panics if the effect parameter is not a int.
 #[no_mangle]
-extern "C" fn effect_parameter_get_as_int(ptr: ExternPointer<EffectParameter>) -> i64 {
+extern "C" fn effect_parameter_get_as_int(ptr: ExternPointer<EffectParameter>) -> NativeResult<i64> {
     let p = ptr.as_ref();
     if let EffectParameter::Int(_, b) = p {
-        return *b;
+        NativeResult::ok(*b)
+    } else {
+        NativeResult::err(anyhow!("Unexpected effect parameter. Expected int, was: {}", p))
     }
-    panic!("Unexpected effect parameter. Expected int, was: {}", p);
 }
 
 /// Get the float contained in the effect parameter, panics if the effect parameter is not a float.
 #[no_mangle]
-extern "C" fn effect_parameter_get_as_float(ptr: ExternPointer<EffectParameter>) -> f32 {
+extern "C" fn effect_parameter_get_as_float(ptr: ExternPointer<EffectParameter>) -> NativeResult<f32> {
     let p = ptr.as_ref();
     if let EffectParameter::Float(_, b) = p {
-        return *b;
+        NativeResult::ok(*b)
+    } else {
+        NativeResult::err(anyhow!("Unexpected effect parameter. Expected float, was: {}", p))
     }
-    panic!("Unexpected effect parameter. Expected float, was: {}", p);
 }
 
 /// Get the string contained in the effect parameter, panics if the effect parameter is not a string.
 #[no_mangle]
-extern "C" fn effect_parameter_get_as_string(ptr: ExternPointer<EffectParameter>) -> OwnedPtr<c_char> {
+extern "C" fn effect_parameter_get_as_string(ptr: ExternPointer<EffectParameter>) -> NativeResult<OwnedPtr<c_char>> {
     let p = ptr.as_ref();
     if let EffectParameter::String(_, b) = p {
-        return CString::new(b.str().to_string()).unwrap().into_raw();
+        match CString::new(b.str().to_string()) {
+            Ok(cstr) => NativeResult::ok(cstr.into_raw()),
+            Err(_) => NativeResult::err(PkmnError::InvalidCString.into()),
+        }
+    } else {
+        NativeResult::err(anyhow!("Unexpected effect parameter. Expected string, was: {}", p))
     }
-    panic!("Unexpected effect parameter. Expected string, was: {}", p);
 }

src/ffi/static_data/move_data.rs

@@ -1,9 +1,10 @@
-use crate::ffi::{ffi_arc_dyn_getter, BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr};
+use crate::ffi::{ffi_arc_dyn_getter, BorrowedPtr, ExternPointer, IdentifiablePointer, NativeResult, OwnedPtr};
 use crate::static_data::{
     EffectParameter, MoveCategory, MoveData, MoveDataImpl, MoveTarget, SecondaryEffect, SecondaryEffectImpl,
     TypeIdentifier,
 };
 use crate::StringKey;
+use anyhow::anyhow;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr, CString};
 use std::ptr::drop_in_place;
@@ -23,12 +24,19 @@ unsafe extern "C" fn move_data_new(
     secondary_effect: *mut Box<dyn SecondaryEffect>,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<dyn MoveData>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn MoveData>>> {
     let flags = std::slice::from_raw_parts(flags, flags_length);
-    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let name: StringKey = match CStr::from_ptr(name).to_str() {
+        Ok(name) => name.into(),
+        Err(_) => return NativeResult::err_from_str("Unable to convert name to string"),
+    };
     let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
     for flag in flags {
-        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+        let flag = match CStr::from_ptr(*flag).to_str() {
+            Ok(flag) => flag,
+            Err(_) => return NativeResult::err_from_str("Unable to convert flag to string"),
+        };
+        flags_set.insert(flag.into());
     }
     let secondary_effect = if secondary_effect.is_null() {
         None
@@ -47,7 +55,7 @@ unsafe extern "C" fn move_data_new(
         secondary_effect,
         flags_set,
     ));
-    a.into()
+    NativeResult::ok(a.into())
 }
 
 /// Drops a reference counted move.
@@ -58,9 +66,12 @@ unsafe extern "C" fn move_data_drop(ptr: OwnedPtr<Arc<dyn MoveData>>) {
 
 /// The name of the move.
 #[no_mangle]
-unsafe extern "C" fn move_data_name(ptr: ExternPointer<Arc<dyn MoveData>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn move_data_name(ptr: ExternPointer<Arc<dyn MoveData>>) -> NativeResult<OwnedPtr<c_char>> {
     let name = ptr.as_ref().name();
-    CString::new(name.str()).unwrap().into_raw()
+    match CString::new(name.str()) {
+        Ok(name) => NativeResult::ok(name.into_raw()),
+        Err(_) => NativeResult::err_from_str("Unable to convert name to string"),
+    }
 }
 
 ffi_arc_dyn_getter!(MoveData, move_type, TypeIdentifier);
@@ -122,8 +133,16 @@ unsafe extern "C" fn secondary_effect_chance(ptr: ExternPointer<Box<dyn Secondar
 
 /// The name of the effect.
 #[no_mangle]
-unsafe extern "C" fn secondary_effect_effect_name(ptr: ExternPointer<Box<dyn SecondaryEffect>>) -> OwnedPtr<c_char> {
+unsafe extern "C" fn secondary_effect_effect_name(
-    CString::new(ptr.as_ref().effect_name().str()).unwrap().into_raw()
+    ptr: ExternPointer<Box<dyn SecondaryEffect>>,
+) -> NativeResult<OwnedPtr<c_char>> {
+    match CString::new(ptr.as_ref().effect_name().str()) {
+        Ok(name) => NativeResult::ok(name.into_raw()),
+        Err(_) => NativeResult::err(anyhow!(
+            "Unable to convert effect name '{}' to CString",
+            ptr.as_ref().effect_name()
+        )),
+    }
 }
 
 /// The length of parameters of the effect.

src/ffi/static_data/species.rs

@@ -1,8 +1,9 @@
 use crate::ffi::{
-    ffi_arc_dyn_getter, ffi_arc_stringkey_getter, BorrowedPtr, ExternPointer, IdentifiablePointer, OwnedPtr,
+    ffi_arc_dyn_getter, ffi_arc_stringkey_getter, BorrowedPtr, ExternPointer, IdentifiablePointer, NativeResult,
+    OwnedPtr,
 };
 use crate::static_data::{Form, Gender, Species, SpeciesImpl};
-use crate::{Random, StringKey};
+use crate::{PkmnError, Random, StringKey};
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr};
 use std::ptr::drop_in_place;
@@ -19,25 +20,40 @@ unsafe extern "C" fn species_new(
     default_form: OwnedPtr<Arc<dyn Form>>,
     flags: *const *const c_char,
     flags_length: usize,
-) -> IdentifiablePointer<Arc<dyn Species>> {
+) -> NativeResult<IdentifiablePointer<Arc<dyn Species>>> {
-    let name: StringKey = CStr::from_ptr(name).to_str().unwrap().into();
+    let name: StringKey = match CStr::from_ptr(name).to_str() {
-    let growth_rate: StringKey = CStr::from_ptr(growth_rate).to_str().unwrap().into();
+        Ok(name) => name.into(),
+        Err(_) => return NativeResult::err(PkmnError::InvalidCString.into()),
+    };
+    let growth_rate: StringKey = match CStr::from_ptr(growth_rate).to_str() {
+        Ok(growth_rate) => growth_rate.into(),
+        Err(_) => return NativeResult::err(PkmnError::InvalidCString.into()),
+    };
 
     let flags = std::slice::from_raw_parts(flags, flags_length);
     let mut flags_set: HashSet<StringKey> = HashSet::with_capacity(flags_length);
     for flag in flags {
-        flags_set.insert(CStr::from_ptr(*flag).to_str().unwrap().into());
+        let flag = match CStr::from_ptr(*flag).to_str() {
+            Ok(flag) => flag,
+            Err(_) => return NativeResult::err(PkmnError::InvalidCString.into()),
+        };
+        flags_set.insert(flag.into());
     }
+    let default_form = match default_form.as_ref() {
+        Some(default_form) => default_form,
+        None => return NativeResult::err(PkmnError::NullReference.into()),
+    };
+
     let a: Arc<dyn Species> = Arc::new(SpeciesImpl::new(
         id,
         &name,
         gender_rate,
         &growth_rate,
         capture_rate,
-        default_form.as_ref().unwrap().clone(),
+        default_form.clone(),
         flags_set,
     ));
-    a.into()
+    NativeResult::ok(a.into())
 }
 
 /// Drop a reference to the species.
@@ -58,9 +74,13 @@ unsafe extern "C" fn species_add_form(
     mut species: ExternPointer<Arc<dyn Species>>,
     name: BorrowedPtr<c_char>,
     form: OwnedPtr<Arc<dyn Form>>,
-) {
+) -> NativeResult<()> {
-    let form = form.as_ref().unwrap().clone();
+    let form = match form.as_ref() {
-    species.as_mut().add_form(CStr::from_ptr(name).into(), form)
+        Some(form) => form.clone(),
+        None => return NativeResult::err(PkmnError::NullReference.into()),
+    };
+    species.as_mut().add_form(CStr::from_ptr(name).into(), form);
+    NativeResult::ok(())
 }
 
 /// Gets a form by name.

src/lib.rs

@@ -64,6 +64,9 @@ use thiserror::Error;
 /// that can fail. For uncommon errors, anyhow is used.
 #[derive(Error, Debug)]
 pub enum PkmnError {
+    /// The given value was null
+    #[error("The given value was null")]
+    NullReference,
     /// The given index is out of bounds for the given length of the array.
     #[error("The given index {index} is out of bounds for the given len {len}")]
     IndexOutOfBounds {
@@ -94,4 +97,13 @@ pub enum PkmnError {
         /// The nature that was requested
         nature: StringKey,
     },
+    /// Unable to get species
+    #[error("Unable to get species {species}")]
+    InvalidSpeciesName {
+        /// The species that was requested
+        species: StringKey,
+    },
+    /// The given pointer is not a valid CString
+    #[error("The given pointer is not a valid CString")]
+    InvalidCString,
 }

src/script_implementations/mod.rs

@@ -1,3 +1,10 @@
 /// The WASM module handles loading dynamic scripts through WebAssembly.
 #[cfg(feature = "wasm")]
+// FIXME: allow these for now until we have a good result interface defined.
+#[allow(clippy::unwrap_used)]
+#[allow(clippy::expect_used)]
+#[allow(clippy::indexing_slicing)]
+#[allow(clippy::string_slice)]
+#[allow(clippy::exit)]
+#[allow(clippy::panic)]
 pub mod wasm;

src/script_implementations/wasm/export_registry/dynamic_data/battle_side.rs

@@ -78,7 +78,7 @@ register! {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
             let script = side.value_func(&env).unwrap().add_volatile_script(&c_name.as_ref().into()).unwrap();
             if let Some(script) = script {
-                let script = script.get_as::<WebAssemblyScript>();
+                let script = script.get_as::<WebAssemblyScript>().unwrap();
                 script.get_wasm_pointer()
             } else {
                 0
@@ -101,7 +101,7 @@ register! {
 
             if let Some(script) = script {
                 let script = side.add_volatile_script_with_script(script);
-                let s = script.as_ref().unwrap().as_ref().unwrap().get_as::<WebAssemblyScript>();
+                let s = script.as_ref().unwrap().as_ref().unwrap().get_as::<WebAssemblyScript>().unwrap();
                 s.get_wasm_pointer()
             } else {
                 0
@@ -129,7 +129,7 @@ register! {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
             let script = side.value_func(&env).unwrap().get_volatile_script(&c_name.as_ref().into());
             if let Some(script) = script {
-                let script = script.get_as::<WebAssemblyScript>();
+                let script = script.get_as::<WebAssemblyScript>().unwrap();
                 script.get_wasm_pointer()
             } else {
                 0
@@ -144,7 +144,7 @@ register! {
     ) {
         unsafe {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
-            side.value_func(&env).unwrap().remove_volatile_script(&c_name.as_ref().into());
+            side.value_func(&env).unwrap().remove_volatile_script(&c_name.as_ref().into()).unwrap();
         }
     }
 

src/script_implementations/wasm/export_registry/dynamic_data/pokemon.rs

@@ -413,7 +413,7 @@ register! {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
             let script = pokemon.value_func(&env).unwrap().add_volatile_script(&c_name.as_ref().into()).unwrap();
             if let Some(script) = script {
-                let script = script.get_as::<WebAssemblyScript>();
+                let script = script.get_as::<WebAssemblyScript>().unwrap();
                 script.get_wasm_pointer()
             } else {
                 0
@@ -436,7 +436,7 @@ register! {
 
             if let Some(script) = script {
                 let script = pokemon.add_volatile_script_with_script(script);
-                let s = script.as_ref().unwrap().as_ref().unwrap().get_as::<WebAssemblyScript>();
+                let s = script.as_ref().unwrap().as_ref().unwrap().get_as::<WebAssemblyScript>().unwrap();
                 s.get_wasm_pointer()
             } else {
                 0
@@ -464,7 +464,7 @@ register! {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
             let script = pokemon.value_func(&env).unwrap().get_volatile_script(&c_name.as_ref().into());
             if let Some(script) = script {
-                let script = script.get_as::<WebAssemblyScript>();
+                let script = script.get_as::<WebAssemblyScript>().unwrap();
                 script.get_wasm_pointer()
             } else {
                 0
@@ -479,7 +479,7 @@ register! {
     ) {
         unsafe {
             let c_name = CStr::from_ptr(env.data().data().get_raw_pointer(name_ptr));
-            pokemon.value_func(&env).unwrap().remove_volatile_script(&c_name.as_ref().into());
+            pokemon.value_func(&env).unwrap().remove_volatile_script(&c_name.as_ref().into()).unwrap();
         }
     }
 

src/script_implementations/wasm/mod.rs

@@ -1,6 +1,3 @@
-// allow these for now until we have a good result interface defined.
-#[allow(clippy::unwrap_used)]
-#[allow(clippy::expect_used)]
 /// The export registry module deals with registering all functions we require in WebAssembly.
 mod export_registry;
 /// A hacky extern ref implementation to ensure the client does not do things it is not allowed to do.

src/static_data/growth_rates.rs

@@ -1,4 +1,5 @@
 use crate::defines::LevelInt;
+use crate::VecExt;
 use anyhow::Result;
 use anyhow_ext::ensure;
 
@@ -37,9 +38,12 @@ impl GrowthRate for LookupGrowthRate {
     fn calculate_experience(&self, level: LevelInt) -> Result<u32> {
         ensure!(level > 0, "Level must be greater than 0, but was {}", level);
         if level >= self.experience.len() as LevelInt {
-            Ok(*self.experience.last().unwrap())
+            match self.experience.last() {
+                Some(v) => Ok(*v),
+                None => anyhow::bail!("No experience values found"),
+            }
         } else {
-            Ok(self.experience[(level - 1) as usize])
+            Ok(*self.experience.get_res((level - 1) as usize)?)
         }
     }
 }

src/static_data/libraries/data_library.rs

@@ -1,3 +1,4 @@
+use anyhow_ext::Result;
 use std::sync::Arc;
 
 use indexmap::IndexMap;
@@ -48,8 +49,11 @@ pub trait DataLibrary<T: ?Sized> {
     }
 
     /// Gets a random value from the library.
-    fn random_value(&self, rand: &mut Random) -> &Arc<T> {
+    fn random_value(&self, rand: &mut Random) -> Result<&Arc<T>> {
         let i = rand.get_between(0, self.len() as i32);
-        return self.map().get_index(i as usize).unwrap().1;
+        match self.map().get_index(i as usize) {
+            Some(v) => Ok(v.1),
+            None => anyhow::bail!("No value found for index {}", i),
+        }
     }
 }

src/utils/mod.rs

@@ -4,6 +4,8 @@ pub use random::Random;
 pub use string_key::StringKey;
 #[doc(inline)]
 pub use value_identifier::*;
+#[doc(inline)]
+pub use vec_ext::*;
 
 /// The random module defines a RNG implementation used in pkmn_lib
 mod random;
@@ -12,3 +14,5 @@ mod random;
 mod string_key;
 /// Helper tool to keep track of moving memory for FFI.
 mod value_identifier;
+/// Helper functions for vecs
+mod vec_ext;

src/utils/vec_ext.rs

@@ -0,0 +1,36 @@
+use crate::PkmnError;
+use anyhow::Result;
+
+/// Extension trait for `Vec` and `[T]` to provide common helper methods.
+pub trait VecExt<T> {
+    /// Get a mutable reference to an element in the vector, or return an error if the index is out of bounds.
+    fn get_mut_res(&mut self, index: usize) -> Result<&mut T>;
+    /// Get a reference to an element in the vector, or return an error if the index is out of bounds.
+    fn get_res(&self, index: usize) -> Result<&T>;
+}
+
+impl<T> VecExt<T> for [T] {
+    fn get_mut_res(&mut self, index: usize) -> Result<&mut T> {
+        let len = self.len();
+        self.get_mut(index)
+            .ok_or(PkmnError::IndexOutOfBounds { index, len }.into())
+    }
+
+    fn get_res(&self, index: usize) -> Result<&T> {
+        self.get(index)
+            .ok_or(PkmnError::IndexOutOfBounds { index, len: self.len() }.into())
+    }
+}
+
+impl<T> VecExt<T> for Vec<T> {
+    fn get_mut_res(&mut self, index: usize) -> Result<&mut T> {
+        let len = self.len();
+        self.get_mut(index)
+            .ok_or(PkmnError::IndexOutOfBounds { index, len }.into())
+    }
+
+    fn get_res(&self, index: usize) -> Result<&T> {
+        self.get(index)
+            .ok_or(PkmnError::IndexOutOfBounds { index, len: self.len() }.into())
+    }
+}

tests/common/test_case.rs

@@ -56,7 +56,7 @@ impl TestCase {
         }
         let mut battle_parties = Vec::new();
         for party in parties {
-            battle_parties.push(BattleParty::new(party.0.clone(), party.1));
+            battle_parties.push(BattleParty::new(party.0.clone(), party.1).unwrap());
         }
         let mut battle = Battle::new(
             library,

tests/integration.rs

@@ -99,11 +99,13 @@ fn validate_assurance() {
     let party1 = BattleParty::new(
         Arc::new(PokemonParty::new_from_vec(vec![Some(p1.clone())])),
         vec![(0, 0)],
-    );
+    )
+    .unwrap();
     let party2 = BattleParty::new(
         Arc::new(PokemonParty::new_from_vec(vec![Some(p2.clone())])),
         vec![(1, 0)],
-    );
+    )
+    .unwrap();
 
     let battle = Battle::new(lib.clone(), vec![party1, party2], false, 2, 1, None);