bors af3c6e733a Auto merge of #73996 - da-x:short-unique-paths, r=petrochenkov ... diagnostics: shorten paths of unique symbols This is a step towards implementing a fix for #50310, and continuation of the discussion in [Pre-RFC: Nicer Types In Diagnostics - compiler - Rust Internals](https://internals.rust-lang.org/t/pre-rfc-nicer-types-in-diagnostics/11139). Impressed upon me from previous discussion in #21934 that an RFC for this is not needed, and I should just come up with code. The recent improvements to `use` suggestions that I've contributed have given rise to this implementation. Contrary to previous suggestions, it's rather simple logic, and I believe it only reduces the amount of cognitive load that a developer would need when reading type errors. ----- If a symbol name can only be imported from one place, and as long as it was not glob-imported anywhere in the current crate, we can trim its printed path to the last component. 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 from anywhere.		2020-09-03 23:27:45 +00:00
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src	Auto merge of #73996 - da-x:short-unique-paths, r=petrochenkov	2020-09-03 23:27:45 +00:00
Cargo.toml	interface: use OnceCell from standard library	2020-09-01 22:06:39 +01:00