Cannot parse disabled default const

[P-E-P]

Compiler is emitting an error even if the code is disabled.

I tried this code:

fn main() {}

#[cfg(FALSE)]
trait T {
    default const X: u8;
}

I expected to see this happen: Compiles correctly.

Instead, this happened:

./test.rs:5:13: error: expecting ‘!’ but ‘const’ found
    5 |     default const X: u8;
      |             ^~~~~
./test.rs:5:13: error: failed to parse trait item in trait
./test.rs:5:13: error: failed to parse item in crate

https://godbolt.org/z/eP38brEKn

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