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
330 B
Rust
14 lines
330 B
Rust
// MutexGuard<Cell<i32>> must not be Sync, that would be unsound.
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use std::sync::Mutex;
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use std::cell::Cell;
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fn test_sync<T: Sync>(_t: T) {}
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fn main()
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{
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let m = Mutex::new(Cell::new(0i32));
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let guard = m.lock().unwrap();
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test_sync(guard);
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//~^ ERROR `Cell<i32>` cannot be shared between threads safely [E0277]
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}
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