No. That was invalid syntax previously.
But how would you print {x} in 1.57? I doubt you would escape it with {{ in that release. Maybe \{ then? Does that still work in 1.58?
This still smells fishy to me, but I need to dig deeper.
pub fn main() {
let y = 4;
println!("{x}", x=y);
}
pub fn main() {
let x = 4; // unused
println!("{{x}}");
} pub fn main() {
let x = 4; // unused
println!("{x}");
}
error: there is no argument named `x`
--> <source>:3:15
|
3 | println!("{x}");
| ^^^
You would. Brackets were still escaping in that release because you would of course still do `println!("{}", x);`