[WIP] Improvement of mismatching type variable error message#3911

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OddBloke wants to merge 11 commits intopython:masterfrom

OddBloke:bug/963

Commits on Sep 2, 2017

Rough initial implementation of an improved error message
Daniel Watkins
committed

Commits on Sep 3, 2017

List names of arguments with mismatched typevar types
Daniel Watkins
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Handle nested TypeVarTypes
Daniel Watkins
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Handle single-argument case with invalid typevar type
Daniel Watkins
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Only use the new error message for calls
Daniel Watkins
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Update tests for new error message
Daniel Watkins
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Refactor argument formatting to make it usable in other messages
Daniel Watkins
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Format * and ** args consistently in error output
Daniel Watkins
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Fix variable name
Daniel Watkins
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Add explanatory comment
Daniel Watkins
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Combine if statements to slightly reduce verbosity
Daniel Watkins
committed