`rust-analyzer` can't parse leading `|` in patterns

[jinxdash]

rust-analyzer version: 0.3.1178-standalone (latest)

rustc version: 1.60.0

#[derive(Debug)]
enum KeyCode {
    Up,
    Down,
	Left,
}

fn main() {
    foo(KeyCode::Up);
}

fn foo(x: KeyCode) {
	if let (a @ (  KeyCode::Up | KeyCode::Down),) = (x,) {
		println!("{:?}", a);
	}
}

fn bar(x: KeyCode) {
	if let (a @ (| KeyCode::Up | KeyCode::Down),) = (x,) {
                  // ^ Syntax Error: expected a pattern rust-analyzer
		println!("{:?}", a);
	}
}

Actual: Syntax Error at leading | in fn bar

Expected: No Syntax Error (see rust spec)

EDIT: looks like this is a duplicate of #12894