illegal_floating_point_literal_pattern warns twice

[rylev]

With the following code (playground):

fn main() {
    let x = 42.0;

    match x {
        5.0 => {}
        _ => {}
    }
}

I expected to see one warning.

Instead, this happened:

warning: floating-point types cannot be used in patterns
 --> src/main.rs:5:9
  |
5 |         5.0 => {}
  |         ^^^
  |
  = note: `#[warn(illegal_floating_point_literal_pattern)]` on by default
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  = note: for more information, see issue #41620 <https://github.com/rust-lang/rust/issues/41620>

warning: floating-point types cannot be used in patterns
 --> src/main.rs:5:9
  |
5 |         5.0 => {}
  |         ^^^
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
  = note: for more information, see issue #41620 <https://github.com/rust-lang/rust/issues/41620>

warning: 2 warnings emitted

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1.55.0-nightly

(2021-06-23 5a7834050f3a0ebcd117)