rust/tests/ui/macros/bad-concat.rs

fn main() {
    let x: u32 = 42;
    let y: f64 = 3.14;
    let z = "foo";
    let _ = concat!(x, y, z, "bar");
    //~^ ERROR expected a literal
    //~| NOTE only literals
}
review comments: modify note wording and change `println` - Don't print the newline on its own to avoid the possibility of printing it out of order due to `stdout` locking. - Modify wording of `concat!()` with non-literals to not mislead into believing that only `&str` literals are accepted. - Add test for `concat!()` with non-literals. 2018-07-15 18:52:11 +00:00			`fn main() {`
			`let x: u32 = 42;`
			`let y: f64 = 3.14;`
			`let z = "foo";`
			`let _ = concat!(x, y, z, "bar");`
			`//~^ ERROR expected a literal`
			`//~\| NOTE only literals`
			`}`