07e7823c01
If a symbol name can only be imported from one place for a type, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path and print only the name. This has wide implications on error messages with types, for example, shortening `std::vec::Vec` to just `Vec`, as long as there is no other `Vec` importable anywhere. This adds a new '-Z trim-diagnostic-paths=false' option to control this feature. On the good path, with no diagnosis printed, we should try to avoid issuing this query, so we need to prevent trimmed_def_paths query on several cases. This change also relies on a previous commit that differentiates between `Debug` and `Display` on various rustc types, where the latter is trimmed and presented to the user and the former is not.
30 lines
906 B
Plaintext
30 lines
906 B
Plaintext
error[E0404]: expected trait, found derive macro `Hash`
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--> $DIR/issue-37534.rs:1:16
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LL | struct Foo<T: ?Hash> { }
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| ^^^^ not a trait
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help: consider importing this trait instead
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LL | use std::hash::Hash;
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warning: default bound relaxed for a type parameter, but this does nothing because the given bound is not a default; only `?Sized` is supported
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--> $DIR/issue-37534.rs:1:12
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LL | struct Foo<T: ?Hash> { }
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| ^
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error[E0392]: parameter `T` is never used
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--> $DIR/issue-37534.rs:1:12
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LL | struct Foo<T: ?Hash> { }
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| ^ unused parameter
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= help: consider removing `T`, referring to it in a field, or using a marker such as `PhantomData`
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error: aborting due to 2 previous errors; 1 warning emitted
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Some errors have detailed explanations: E0392, E0404.
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For more information about an error, try `rustc --explain E0392`.
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