diff --git a/src/lib.rs b/src/lib.rs
index 0b0c0ec..a804f76 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 #![feature(concat_idents)]
 #![feature(exclusive_range_pattern)]
 #![feature(assert_matches)]
+#![feature(fn_traits)]
 
 pub(crate) mod defines;
 pub mod logger;
diff --git a/src/logger/messages.rs b/src/logger/messages.rs
index c3e9537..d951a75 100644
--- a/src/logger/messages.rs
+++ b/src/logger/messages.rs
@@ -1,7 +1,15 @@
+use crate::parsing::lexer::lex_tokens::TokenType;
+
 #[derive(Debug)]
 pub enum Message {
     UnexpectedCharacter(char),
-    InvalidCharacter { found: char, expected: char },
+    InvalidCharacter {
+        found: char,
+        expected: char,
+    },
     UnclosedStringLiteral,
-    UnexpectedToken(),
+    UnexpectedToken {
+        found: TokenType,
+        expected: Vec<TokenType>,
+    },
 }
diff --git a/src/parsing/lexer/lex_tokens.rs b/src/parsing/lexer/lex_tokens.rs
index 9320c1b..40c0f6c 100644
--- a/src/parsing/lexer/lex_tokens.rs
+++ b/src/parsing/lexer/lex_tokens.rs
@@ -3,10 +3,10 @@ use crate::span::Span;
 
 pub struct LexToken {
     pub token_type: TokenType,
-    pub span: Span
+    pub span: Span,
 }
 
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq, Debug, Clone)]
 pub enum TokenType {
     EndOfFile,
     WhiteSpace,
diff --git a/src/parsing/parser/mod.rs b/src/parsing/parser/mod.rs
index ff402f5..fa81e14 100644
--- a/src/parsing/parser/mod.rs
+++ b/src/parsing/parser/mod.rs
@@ -3,7 +3,9 @@ pub mod parsed_statement;
 mod parser_tests;
 
 use super::lexer::lex_tokens::{LexToken, TokenType};
+use crate::logger::messages::Message;
 use crate::parsing::parser::parsed_statement::ParsedStatement;
+use crate::span::Span;
 use itertools::{Itertools, MultiPeek};
 
 struct ParseReader<'a> {
@@ -39,11 +41,20 @@ impl<'a> ParseReader<'a> {
         }
     }
 
-    pub fn consume(&mut self, token: TokenType) -> &LexToken {
+    pub fn consume(
+        &mut self,
+        expected: TokenType,
+        log: &mut dyn FnMut(Message, Span),
+    ) -> &LexToken {
         let n = self.next();
-        if n.token_type != token {
-            // TODO: log error
-            unimplemented!()
+        if n.token_type != expected {
+            log(
+                Message::UnexpectedToken {
+                    expected: vec![expected],
+                    found: n.token_type.clone(),
+                },
+                n.span,
+            );
         }
         n
     }
@@ -54,20 +65,23 @@ impl<'a> ParseReader<'a> {
     }
 }
 
-pub fn parse(tokens: Vec<LexToken>) -> Box<ParsedStatement> {
+pub fn parse(tokens: Vec<LexToken>, log: &mut dyn FnMut(Message, Span)) -> Box<ParsedStatement> {
     let mut reader = ParseReader {
         tokens: tokens.iter().multipeek(),
     };
-    parse_script(&mut reader)
+    parse_script(&mut reader, log)
 }
 
-fn parse_script(reader: &mut ParseReader) -> Box<ParsedStatement> {
+fn parse_script(
+    reader: &mut ParseReader,
+    log: &mut dyn FnMut(Message, Span),
+) -> Box<ParsedStatement> {
     let mut vec: Vec<Box<ParsedStatement>> = Vec::new();
     loop {
         let n = reader.peek();
         match n.token_type {
             TokenType::NamespaceKeyword => {
-                vec.push(parse_namespace(reader));
+                vec.push(parse_namespace(reader, log));
             }
             TokenType::EndOfFile => break,
             _ => {
@@ -79,7 +93,10 @@ fn parse_script(reader: &mut ParseReader) -> Box<ParsedStatement> {
     Box::new(ParsedStatement::Script(vec))
 }
 
-fn parse_namespace(reader: &mut ParseReader) -> Box<ParsedStatement> {
+fn parse_namespace(
+    reader: &mut ParseReader,
+    log: &mut dyn FnMut(Message, Span),
+) -> Box<ParsedStatement> {
     reader.next(); // Consume namespace
     let identifier_token = reader.next();
     let s: String;
@@ -88,12 +105,17 @@ fn parse_namespace(reader: &mut ParseReader) -> Box<ParsedStatement> {
             s = i.to_string();
         }
         _ => {
-            // Log error
-            unimplemented!();
+            log(
+                Message::UnexpectedToken {
+                    found: identifier_token.token_type.clone(),
+                    expected: vec![TokenType::Identifier(String::new())],
+                },
+                identifier_token.span,
+            );
         }
     }
-    reader.consume(TokenType::OpenCurlyBracket);
-    let script = parse_script(reader);
-    reader.consume(TokenType::CloseCurlyBracket);
+    reader.consume(TokenType::OpenCurlyBracket, log);
+    let script = parse_script(reader, log);
+    reader.consume(TokenType::CloseCurlyBracket, log);
     Box::new(ParsedStatement::Namespace(s, script))
 }
diff --git a/src/parsing/parser/parser_tests.rs b/src/parsing/parser/parser_tests.rs
index f4d0a3c..35ce779 100644
--- a/src/parsing/parser/parser_tests.rs
+++ b/src/parsing/parser/parser_tests.rs
@@ -16,15 +16,20 @@ fn create_tokens(types: Vec<TokenType>) -> Vec<LexToken> {
 
 #[test]
 fn test_empty_namespace() {
-    let script = parse(create_tokens(vec![
-        TokenType::NamespaceKeyword,
-        TokenType::WhiteSpace,
-        TokenType::Identifier("foo".to_string()),
-        TokenType::WhiteSpace,
-        TokenType::OpenCurlyBracket,
-        TokenType::CloseCurlyBracket,
-        TokenType::EndOfFile,
-    ]));
+    let script = parse(
+        create_tokens(vec![
+            TokenType::NamespaceKeyword,
+            TokenType::WhiteSpace,
+            TokenType::Identifier("foo".to_string()),
+            TokenType::WhiteSpace,
+            TokenType::OpenCurlyBracket,
+            TokenType::CloseCurlyBracket,
+            TokenType::EndOfFile,
+        ]),
+        &mut |_message, _span| {
+            unimplemented!();
+        },
+    );
     if let ParsedStatement::Script(inner) = script.as_ref() {
         assert_eq!(1, inner.len());
         if let ParsedStatement::Namespace(identifier, inner_script) = inner[0].as_ref() {
diff --git a/src/span.rs b/src/span.rs
index 7b46ba4..2adedd7 100644
--- a/src/span.rs
+++ b/src/span.rs
@@ -1,3 +1,4 @@
+#[derive(Copy, Clone, Debug)]
 pub struct Span {
     pub start: usize,
     pub end: usize,