# HG changeset patch
# User Greg Ward <greg@gerg.ca>
# Date 2011-10-01 20:42:39
# Node ID 56da00994067977f1e4377020b2a9aabccdafee7
# Parent  62dc0e7ab092e10cb8dee3eac16108073dd71cea

extensions: print some debug info on import failure

This is handy if hgext.foo exists but has a bogus "import blah":
previously we just discarded the "No module named blah" error. Now at
least you can see it with --debug. Not perfect, but better than
nothing.

diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -69,7 +69,9 @@ def load(ui, name, path):
             return mod
         try:
             mod = importh("hgext.%s" % name)
-        except ImportError:
+        except ImportError, err:
+            ui.debug('could not import hgext.%s (%s): trying %s\n'
+                     % (name, err, name))
             mod = importh(name)
     _extensions[shortname] = mod
     _order.append(shortname)