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.
20 lines
675 B
Plaintext
20 lines
675 B
Plaintext
error[E0392]: parameter `'a` is never used
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--> $DIR/variance-unused-region-param.rs:3:19
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LL | struct SomeStruct<'a> { x: u32 }
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| ^^ unused parameter
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= help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
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error[E0392]: parameter `'a` is never used
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--> $DIR/variance-unused-region-param.rs:4:15
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LL | enum SomeEnum<'a> { Nothing }
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| ^^ unused parameter
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= help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0392`.
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