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Remove support for specializing ToString outside the standard library This is the only trait specializable outside of the standard library. Before stabilizing specialization we will probably want to remove support for this. It was originally made specializable to allow a more efficient ToString in libproc_macro back when this way the only way to get any data out of a TokenStream. We now support getting individual tokens, so proc macros no longer need to call it as often.
This directory contains the test for incorrect usage of specialization that should lead to compile failure. Those tests break down into a few categories:
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Feature gating
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Overlap checking with specialization enabled
- Basic overlap scenarios
- Includes purely structural overlap
- Includes purely trait-based overlap
- Includes mix
- Overlap with differing polarity
- Basic overlap scenarios
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Attempt to rely on projection of a
defaulttype