Do not show negative polarity trait implementations in diagnostic messages for similar implementations#79606

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bors merged 3 commits intorust-lang:masterfrom

ThePuzzlemaker:issue-79458-fix

Dec 2, 2020

Commits on Dec 1, 2020

Ignore trait implementations with negative polarity when suggesting trait implementations in diagnostics
ThePuzzlemaker
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Fix UI tests for negative polarity implementations of traits
ThePuzzlemaker
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Add regression test for #79458
ThePuzzlemaker
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