patch: descriptive patchmeta.__repr__ to help debugging

mercurial/patch.py

@@ -303,6 +303,9 b' class patchmeta(object):'
         isexec = mode & 0100
         self.mode = (islink, isexec)
 
+    def __repr__(self):
+        return "<patchmeta %s %r>" % (self.op, self.path)
+
 def readgitpatch(lr):
     """extract git-style metadata about patches from <patchname>"""