rust/tests/ui/specialization/defaultimpl/specialization-wfcheck.rs

// Tests that a default impl still has to have a WF trait ref.

#![feature(specialization)] //~ WARN the feature `specialization` is incomplete

trait Foo<'a, T: Eq + 'a> { }

default impl<U> Foo<'static, U> for () {}
//~^ ERROR the trait bound `U: Eq` is not satisfied

fn main(){}
add Self: Trait<..> inside the param_env of a default impl 2018-02-14 17:25:42 +00:00			`// Tests that a default impl still has to have a WF trait ref.`

warn against 'specialization' feature 2020-05-17 10:22:48 +02:00			#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
support `default impl` for specialization not skipping any wfchecks on default impls 2017-11-21 07:27:20 +00:00
			`trait Foo<'a, T: Eq + 'a> { }`

			`default impl<U> Foo<'static, U> for () {}`
pretty: trim paths of unique symbols 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. 2020-09-02 10:40:56 +03:00			//~^ ERROR the trait bound `U: Eq` is not satisfied
support `default impl` for specialization not skipping any wfchecks on default impls 2017-11-21 07:27:20 +00:00
add Self: Trait<..> inside the param_env of a default impl 2018-02-07 06:58:01 +00:00			`fn main(){}`