Exception now has helpful string.

Before; ``` File "/usr/local/google/home/tansell/foss/timvideos/hdmi2usb/i2cslave/build/lib/python3.4/site-packages/migen-0.2-py3 .4.egg/migen/fhdl/structure.py", line 110, in __getitem__ raise TypeError TypeError ``` After; ``` File "/usr/local/google/home/tansell/foss/timvideos/hdmi2usb/i2cslave/build/lib/python3.4/site-packages/migen-0.2-py3.4.egg/migen/fhdl/structure.py", line 110, in __getitem__ raise TypeError("Can use type %s (%r) as key" % (type(key), key)) TypeError: Can use type <class 'migen.fhdl.structure.Signal'> (<Signal dbits at 0x7fd7836a2a90>) as key ```
m-labs · Jan 3, 2016 · 3fca6c1 · 3fca6c1 · jordens · Jan 4, 2016
1 parent 03bfb4b
commit 3fca6c1
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/migen/fhdl/structure.py b/migen/fhdl/structure.py
@@ -107,7 +107,8 @@ def __getitem__(self, key):
                 return Cat(self[i] for i in range(start, stop, step))
             return _Slice(self, start, stop)
         else:
-            raise TypeError
+            raise TypeError("Can use type {} ({}) as key".format(
+                type(key), repr(key)))
 
     def eq(self, r):
         """Assignment