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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
288 B
Rust
13 lines
288 B
Rust
// Check that closures do not implement `Clone` if their environment is not `Clone`.
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struct S(i32);
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fn main() {
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let a = S(5);
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let hello = move || {
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println!("Hello {}", a.0);
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};
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let hello = hello.clone(); //~ ERROR the trait bound `S: Clone` is not satisfied
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}
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