[issue20530] Change the text signature format (again) to be more robust

[Yury Selivanov]

Yury Selivanov added the comment:

One more patch (v4)

I fixed the commented out 'ThisWorksNow' test.
And also 'inspect.signature' now raises a bit
more coherent exception for that particular case.

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Added file: http://bugs.python.org/file33966/larry.even.newerer.signature.syntax.4.diff

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