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.
26 lines
599 B
Rust
26 lines
599 B
Rust
use std::cell::Cell;
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use std::rc::Rc;
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// Fast path, main can see the concrete type returned.
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fn before() -> impl Fn(i32) {
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let p = Rc::new(Cell::new(0));
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move |x| p.set(x)
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}
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fn send<T: Send>(_: T) {}
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fn main() {
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send(before());
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//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
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send(after());
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//~^ ERROR `Rc<Cell<i32>>` cannot be sent between threads safely
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}
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// Deferred path, main has to wait until typeck finishes,
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// to check if the return type of after is Send.
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fn after() -> impl Fn(i32) {
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let p = Rc::new(Cell::new(0));
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move |x| p.set(x)
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}
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