diff --git a/schala-lang/language/src/ast.rs b/schala-lang/language/src/ast.rs
index 19e28d2..8438282 100644
--- a/schala-lang/language/src/ast.rs
+++ b/schala-lang/language/src/ast.rs
@@ -2,7 +2,6 @@ use std::rc::Rc;
 use std::convert::From;
 
 use source_map::{SourceMap};
-
 use builtin::{BinOp, PrefixOp};
 
 #[derive(Debug, PartialEq)]
diff --git a/schala-lang/language/src/parsing.rs b/schala-lang/language/src/parsing.rs
index 5b210e9..4f200af 100644
--- a/schala-lang/language/src/parsing.rs
+++ b/schala-lang/language/src/parsing.rs
@@ -87,6 +87,7 @@ impl Parser {
     self.token_handler.next()
   }
 
+  /*
   fn next_mapped(&mut self) -> SourceMap<TokenKind> {
     let tt = self.next();
     SourceMap {
@@ -94,6 +95,7 @@ impl Parser {
       data: Some(SourceData { line_number: 420, char_idx: 69 })
     }
   }
+  */
 
   pub fn parse(&mut self) -> ParseResult<AST> {
     self.program()
@@ -1024,24 +1026,21 @@ impl Parser {
   #[recursive_descent_method]
   fn int_literal(&mut self) -> ParseResult<Expression> {
     use self::ExpressionType::*;
-    match self.next_mapped() {
-      t => match t.get() {
-        BinNumberSigil => {
-          let digits = self.digits()?;
-          let n = parse_binary(digits)?;
-          Ok(Expression(NatLiteral(n), None))
-        },
-        HexLiteral(text) => {
-          let digits: String = text.chars().filter(|c| c.is_digit(16)).collect();
-          let n = parse_hex(digits)?;
-          Ok(Expression(NatLiteral(n), None))
-        },
-        _ => return ParseError::new("Expected '0x' or '0b'"),
-      }
+    match self.next() {
+      BinNumberSigil => {
+        let digits = self.digits()?;
+        let n = parse_binary(digits)?;
+        Ok(Expression(NatLiteral(n), None))
+      },
+      HexLiteral(text) => {
+        let digits: String = text.chars().filter(|c| c.is_digit(16)).collect();
+        let n = parse_hex(digits)?;
+        Ok(Expression(NatLiteral(n), None))
+      },
+      _ => return ParseError::new("Expected '0x' or '0b'"),
     }
   }
 
-
   #[recursive_descent_method]
   fn float_literal(&mut self) -> ParseResult<Expression> {
     use self::ExpressionType::*;
diff --git a/schala-lang/language/src/source_map.rs b/schala-lang/language/src/source_map.rs
index 681868a..d8452f4 100644
--- a/schala-lang/language/src/source_map.rs
+++ b/schala-lang/language/src/source_map.rs
@@ -10,9 +10,11 @@ impl<T> SourceMap<T> {
     &self.node
   }
 
+  /*
   pub fn get_source_data(&self) -> Option<SourceData> {
     self.data.clone()
   }
+  */
 }
 
 #[derive(Debug, Clone)]