From f14dd377dd0de86845fcf7ccb789f243366d2360 Mon Sep 17 00:00:00 2001
From: Marion <marion.zepf@gmail.com>
Date: Tue, 08 Oct 2013 15:29:07 +0000
Subject: turn an error during type conversion into a TATypeError

  - This makes it try the next type/ slot/ ...
---
diff --git a/TurtleArt/tatype.py b/TurtleArt/tatype.py
index 78cbcc3..359b5fc 100644
--- a/TurtleArt/tatype.py
+++ b/TurtleArt/tatype.py
@@ -336,19 +336,24 @@ def convert(x, new_type, old_type=None, converter=None):
                                   " for this type combination"))
 
     def _apply_converter(converter, y):
-        if is_an_ast:
-            if converter == identity:
-                return y
-            elif is_instancemethod(converter):
-                func = ast.Attribute(value=y,
-                                     attr=converter.im_func.__name__,
-                                     ctx=ast.Load)
-                return get_call_ast(func)
+        try:
+            if is_an_ast:
+                if converter == identity:
+                    return y
+                elif is_instancemethod(converter):
+                    func = ast.Attribute(value=y,
+                                         attr=converter.im_func.__name__,
+                                         ctx=ast.Load)
+                    return get_call_ast(func)
+                else:
+                    func_name = converter.__name__
+                    return get_call_ast(func_name, [y])
             else:
-                func_name = converter.__name__
-                return get_call_ast(func_name, [y])
-        else:
-            return converter(y)
+                return converter(y)
+        except BaseException:
+            raise TATypeError(bad_value=x, bad_type=old_type,
+                              req_type=new_type, message=("error during "
+                                  "conversion"))
 
     if isinstance(converter, (list, tuple)):
         # apply the converter chain recursively
--
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