Fix infinite loop with functions calls

Upsilon/Parser/Parser.cs

@@ -429,7 +429,7 @@ namespace Upsilon.Parser
             var openParenthesis = MatchToken(SyntaxKind.OpenParenthesis);
             var parameters = ImmutableArray.CreateBuilder<ExpressionSyntax>();
             SyntaxToken current = null;
-            while (Current.Kind != SyntaxKind.CloseParenthesis)
+            while (Current.Kind != SyntaxKind.CloseParenthesis && Current.Kind != SyntaxKind.EndOfFile)
             {
                 if (Current == current)
                 {