Syntax error when using const + exclusive range pattern syntax

[clarfonthey]

rust-analyzer version: rust-analyzer 1 (643bc02de 2023-01-01)

rustc version: rustc 1.68.0-nightly (0b90256ad 2023-01-13)

relevant settings: installed via rustup

Take this snippet: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=a2f288d06c1dfcaf8e916a6eca9594cd

#![feature(inline_const_pat)]
#![feature(exclusive_range_pattern)]
pub fn ohno(val: i128) -> Option<i64> {
    match val {
        const { i64::MAX as i128 + 1 }.. => None,
        ..const { i64::MIN as i128 } => None,
        _ => Some(val as i64),
    }
}

This compiles fine on the latest version of rustc, but I'm getting a syntax error in rust-analyzer on this line:

        ..const { i64::MIN as i128 } => None,

The span of the error appears to be the arrow. I'm not sure if there's a succinct command I can run to get the exact error output, but here's what it looks like via kak-lsp:

(note: the features are applied to the crate, this is just running inside a file in that crate)

[fmease]

I've stumbled upon a similar case where inline const patterns are inside of tuple patterns. It seems like r-a can only parse const patterns at the “top-level” of a pattern.

Minimal reproducer:

fn cmplx_ct_pat() {
    match ((),) {
        (const { () },) => {}
    }
}

Output:

Syntax Error: expected a pattern
Syntax Error: expected R_PAREN
Syntax Error: expected FAT_ARROW
Syntax Error: expected pattern