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.
14 lines
414 B
Rust
14 lines
414 B
Rust
// Test that cross-borrowing (implicitly converting from `Box<T>` to `&T`) is
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// forbidden when `T` is a trait.
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struct Foo;
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trait Trait { fn foo(&self) {} }
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impl Trait for Foo {}
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pub fn main() {
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let x: Box<dyn Trait> = Box::new(Foo);
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let _y: &dyn Trait = x; //~ ERROR E0308
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//~| expected reference `&dyn Trait`
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//~| found struct `Box<dyn Trait>`
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}
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