[issue2598] "{ +(}".format(**{' +(': 44}) should produce ValueError: invalid identifier, ' +(' in format

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

I should have been clearer.  By "The problem, if any, is that **{' +(':
44} is allowed as a parameter", I meant in general, for all
function/method calls.  It's not an issue that's restricted to str.format().

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