rust/tests/ui/not-clone-closure.rs

// Check that closures do not implement `Clone` if their environment is not `Clone`.

struct S(i32);

fn main() {
    let a = S(5);
    let hello = move || {
        println!("Hello {}", a.0);
    };

    let hello = hello.clone(); //~ ERROR the trait bound `S: Clone` is not satisfied
}
Implement `Copy`/`Clone` for closures 2017-09-13 20:40:48 +00:00			// Check that closures do not implement `Clone` if their environment is not `Clone`.

			`struct S(i32);`

			`fn main() {`
			`let a = S(5);`
			`let hello = move \|\| {`
			`println!("Hello {}", a.0);`
			`};`

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 07:40:56 +00:00			let hello = hello.clone(); //~ ERROR the trait bound `S: Clone` is not satisfied
Implement `Copy`/`Clone` for closures 2017-09-13 20:40:48 +00:00			`}`