Diff to diagnose issue 645

gistfile1.diff

diff -r 62c4935c6f63 pygments/util.py
--- a/pygments/util.py	Sat Mar 19 20:00:07 2011 -0700
+++ b/pygments/util.py	Sun Mar 20 17:22:03 2011 -0700
@@ -120,6 +120,8 @@
             return min(1.0, max(0.0, float(rv)))
         except ValueError:
             return 0.0
+        except TypeError:
+            raise TypeError("Error analyzing %r %r %r" % (f, rv, text))
     text_analyse.__doc__ = f.__doc__
     return staticmethod(text_analyse)