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.
13 lines
382 B
Rust
13 lines
382 B
Rust
use std::mem;
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trait Misc {}
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fn size_of_copy<T: Copy+?Sized>() -> usize { mem::size_of::<T>() }
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fn main() {
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size_of_copy::<dyn Misc + Copy>();
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//~^ ERROR only auto traits can be used as additional traits in a trait object
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//~| ERROR only auto traits can be used as additional traits in a trait object
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//~| ERROR the trait bound `dyn Misc: Copy` is not satisfied
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}
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