Pretty print assertion failures in tests#79001

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de-vri-es wants to merge 11 commits intorust-lang:masterfrom

de-vri-es:pretty-print-assertions

Commits on Oct 20, 2021

Add assertion details to panic info.

de-vri-es
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jakoschiko
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Add function to test if terminal supports ANSI color codes.

de-vri-es
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jakoschiko
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Pretty-print assertion failures in `test` with unstable flag.

de-vri-es
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jakoschiko
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Mark panic::ExtraInfo as non-exhaustive.

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jakoschiko
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Add more documentation to `AssertInfo` and related types.

de-vri-es
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jakoschiko
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Replace get_stdout_handle() with io::stdout().as_raw_handle().

de-vri-es
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jakoschiko
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Include macro name in pretty printed assertion.

de-vri-es
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jakoschiko
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Do not show fake operator in pretty-printed assert_matches failure.

de-vri-es
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jakoschiko
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Try to improve performance by reducing the size of involved types
jakoschiko
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Unify signatures of `GetConsoleMode` by changing `HANDLE` to `c_void`
jakoschiko
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Bless test output
jakoschiko
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