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permit negative impls for non-auto traits

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Niko Matsakis 2020-01-08 06:39:38 -05:00
parent a17dd36084
commit e8a05e201e
35 changed files with 328 additions and 101 deletions
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src/librustc_error_codes/error_codes/E0749.md Normal file
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Negative impls are not allowed to have any items. Negative impls
declare that a trait is **not** implemented (and never will be) and
hence there is no need to specify the values for trait methods or
other items.

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src/librustc_error_codes/error_codes/E0750.md Normal file
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Negative impls cannot be default impls. A default impl supplies
default values for the items within to be used by other impls, whereas
a negative impl declares that there are no other impls. These don't
make sense to combine.