Discarding value in closure with underscore shows up as syntax error

[ItsEthra]

In this code:

fn foo(_: impl FnOnce() -> ()) {}

fn main() {
    let bar = || { 5 };
    foo(|| _ = bar());
}

When calling foo, rust-analyzer suggests that there is a syntax error although code compiles fine.

Syntax Error: expected expression rust-analyzer[syntax-error]
Syntax Error: expected COMMA rust-analyzer[syntax-error]
Syntax Error: expected SEMICOLON rust-analyzer[syntax-error]

rust-analyzer version: rust-analyzer version: 0.3.1309-standalone (a2beeb8 2022-12-04)
rustc version: rustc 1.67.0-nightly (c97b539e4 2022-11-30)

[lnicola]

Minimized:

|| _ = 42;