Do not generate type-indecisive expressions in unnecessary_cast
#14492
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However, if they appear within the context of a function argument, they will be marked as certain, as they might eventually be considered `i32` by default if the context is not more specific. Also, in the case of binary expressions, if one of the side is uncertain, then the certainty will come from the other side.
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r? @Alexendoo rustbot has assigned @Alexendoo. Use |
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The lintcheck run contains new false negatives though. |
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Associated constants of primitive types are resolved as `Res::Err` in the HIR. To force a resolution, the primitive type must be recognized as certain. Since they are not ADT, they don't have a `DefId`. By allowing the `Certainty` type to embed a `TypeKind` which is either a `PrimTy` or a `DefId`, we allow primitives types to be resolved, and the associated constants as well. Also, in method calls, if the receiver is not certain, consider that the overall call is not either.
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This change requires fixing the type certainty evaluation:
This might be to be refined further, but this does not break any existing test, and allows for new fixes such as this one.
Fix #14366
changelog: [
unnecessary_cast]: do not remove casts if the expression would become type-indecisive