--- a/python/c3/astnodes.py	Fri Jul 12 17:25:31 2013 +0200
+++ b/python/c3/astnodes.py	Fri Jul 12 17:42:39 2013 +0200
@@ -64,20 +64,26 @@
     def __repr__(self):
         return '({}*)'.format(self.ptype)
 
+class StructField:
+    def __init__(self, name, typ):
+        self.name = name
+        self.typ = typ
+
 class StructureType(Type):
     def __init__(self, mems):
         self.mems = mems
-        for ft, fn in mems:
-            assert type(fn) is str
+        for mem in mems:
+            assert type(mem) is StructField
+            assert type(mem.name) is str
     def hasField(self, name):
-        for ft, fn in self.mems:
-            if name == fn:
+        for mem in self.mems:
+            if name == mem.name:
                 return True
         return False
     def fieldType(self, name):
-        for ft, fn in self.mems:
-            if name == fn:
-                return ft
+        for mem in self.mems:
+            if name == mem.name:
+                return mem.typ
         raise Exception()