--- a/mercurial/demandimport.py
+++ b/mercurial/demandimport.py
@@ -103,7 +103,7 @@ def _demandimport(name, globals=None, lo
setattr(mod, x, _demandmod(x, mod.__dict__, mod.__dict__))
return mod
-ignore = []
+ignore = ['_hashlib']
def enable():
"enable global demand-loading of modules"