Brandur 8702e714bc Catch error and warn if unable to remove a method
In some cases there can be a method that's detected with
`method_defined?`, but which cannot be removed with `remove_method`,
even though it's on the same class. The only case so far that we've
noticed this is when a class is reopened for monkey patching like in
issue #749.

We'll still try to discourage this sort of use, but here we swallow the
error and issue a warning so at least the program doesn't crash.

Fixes #749.
2019-03-18 11:52:35 -07:00
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