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.
34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
error[E0277]: the size for values of type `<Self as Deref>::Target` cannot be known at compilation time
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--> $DIR/issue-42312.rs:4:12
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LL | fn baz(_: Self::Target) where Self: Deref {}
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| ^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `<Self as Deref>::Target`
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= help: unsized locals are gated as an unstable feature
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help: consider further restricting the associated type
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LL | fn baz(_: Self::Target) where Self: Deref, <Self as Deref>::Target: Sized {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | fn baz(_: &Self::Target) where Self: Deref {}
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| ^
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error[E0277]: the size for values of type `(dyn ToString + 'static)` cannot be known at compilation time
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--> $DIR/issue-42312.rs:8:10
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LL | pub fn f(_: dyn ToString) {}
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| ^ doesn't have a size known at compile-time
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= help: the trait `Sized` is not implemented for `(dyn ToString + 'static)`
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= help: unsized locals are gated as an unstable feature
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help: function arguments must have a statically known size, borrowed types always have a known size
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LL | pub fn f(_: &dyn ToString) {}
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| ^
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0277`.
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