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.
25 lines
581 B
Rust
25 lines
581 B
Rust
// ignore-cloudabi no std::fs support
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#![feature(try_trait)]
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use std::ops::Try;
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fn main() {
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// error for a `Try` type on a non-`Try` fn
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std::fs::File::open("foo")?; //~ ERROR the `?` operator can only
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// a non-`Try` type on a non-`Try` fn
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()?; //~ ERROR the `?` operator can only
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// an unrelated use of `Try`
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try_trait_generic::<()>(); //~ ERROR the trait bound
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}
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fn try_trait_generic<T: Try>() -> T {
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// and a non-`Try` object on a `Try` fn.
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()?; //~ ERROR the `?` operator can only be applied to values that implement `Try`
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loop {}
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}
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