rust/tests/ui/fmt/format-string-error-3.rs
Usman Akinyemi 0061a2232d rustc_parse_format: improve diagnostics for unsupported debug = syntax
Detect Python-style f-string debug syntax in format strings and emit a
clear diagnostic explaining that it is not supported in Rust. When the
intended operation can be inferred, suggest the corresponding Rust
alternative e.g from `println!("{=}", x)` to `dbg!({x})`.

Signed-off-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
2026-02-06 00:44:03 +05:30

5 lines
127 B
Rust

//@ run-rustfix
fn main() {
let x = 32;
println!("{=}", x); //~ ERROR invalid format string: python's f-string debug
}