rust/tests/ui/coercion/issue-73886.rs

fn main() {
    let _ = &&[0] as &[_];
    //~^ ERROR non-primitive cast: `&&[i32; 1]` as `&[_]`
    let _ = 7u32 as Option<_>;
    //~^ ERROR non-primitive cast: `u32` as `Option<_>`
}
typeck: check for infer before type impls trait This commit checks that the target type of the cast (an error related to which is being reported) does not have types to be inferred before checking if it implements the `From` trait. Signed-off-by: David Wood <david@davidtw.co> 2020-07-02 14:13:39 +01:00			`fn main() {`
			`let _ = &&[0] as &[_];`
			//~^ ERROR non-primitive cast: `&&[i32; 1]` as `&[_]`
			`let _ = 7u32 as Option<_>;`
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 non-primitive cast: `u32` as `Option<_>`
typeck: check for infer before type impls trait This commit checks that the target type of the cast (an error related to which is being reported) does not have types to be inferred before checking if it implements the `From` trait. Signed-off-by: David Wood <david@davidtw.co> 2020-07-02 14:13:39 +01:00			`}`