Expected tuple struct or tuple variant, found struct variant [E0532]

[MahadMuhammad]

I tried this code:

• for testing E0532 error, Arm Does Not Match Expected Kind - expected tuple struct or tuple variant, found struct variant.
• Godbolt link.

enum State {
    Succeeded,
    Failed(u32),
}

fn print_on_failure(state: &State) {
    match *state {
        // error: expected unit struct, unit variant or constant, found tuple
        //        variant `State::Failed`
        State::Failed => (),
        _ => ()
    }
}

I expected to see this happen:

Abort due to E0532 error

error[E0532]: expected unit struct, unit variant or constant, found tuple variant `State::Failed`
  --> <source>:10:9
   |
3  |     Failed(u32),
   |     ----------- `State::Failed` defined here
...
10 |         State::Failed => (),
   |         ^^^^^^^^^^^^^ help: use the tuple variant pattern syntax instead: `State::Failed(_)`

error: aborting due to previous error

Instead, this happened:

Compiled with warning

<source>:6:1: warning: function is never used: 'print_on_failure'
    6 | fn print_on_failure(state: &State) {
      | ^~
Compiler returned: 0

Meta

• What version of Rust GCC were you using, git sha : ac43e58.
  • gccrs (Compiler-Explorer-Build-gcc-3ccf008b148455c4800f2a7c70be03e1dd708c59-binutils-2.40) 13.0.1 20230417 (experimental)