--- a/python/asm.py	Fri Nov 15 13:52:32 2013 +0100
+++ b/python/asm.py	Thu Nov 21 11:57:27 2013 +0100
@@ -45,15 +45,16 @@
          elif typ == 'STRING':
            val = val[1:-1]
          col = mo.start() - line_start
-         loc = SourceLocation(line, col, 0)   # TODO retrieve length?
+         loc = SourceLocation('', line, col, 0)   # TODO retrieve length?
          yield Token(typ, val, loc)
        pos = mo.end()
        mo = gettok(s, pos)
      if pos != len(s):
        col = pos - line_start
-       loc = SourceLocation(line, col, 0)
+       loc = SourceLocation('', line, col, 0)
        raise CompilerError('Unexpected character {0}'.format(s[pos]), loc)
 
+
 class Lexer:
    def __init__(self, src):
       self.tokens = tokenize(src)
@@ -66,6 +67,7 @@
    def Peak(self):
       return self.curTok
 
+
 class Parser:
     def __init__(self):
         # Construct a parser given a grammar: