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
455 B
Rust
14 lines
455 B
Rust
fn main() {
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let _foo = &[1_usize, 2] as [usize];
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//~^ ERROR cast to unsized type: `&[usize; 2]` as `[usize]`
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let _bar = Box::new(1_usize) as dyn std::fmt::Debug;
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//~^ ERROR cast to unsized type: `Box<usize>` as `dyn Debug`
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let _baz = 1_usize as dyn std::fmt::Debug;
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//~^ ERROR cast to unsized type: `usize` as `dyn Debug`
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let _quux = [1_usize, 2] as [usize];
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//~^ ERROR cast to unsized type: `[usize; 2]` as `[usize]`
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}
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