File: issue-44333.rs

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rustc 1.87.0%2Bdfsg1-1
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type Func = fn(usize, usize) -> usize;

fn foo(a: usize, b: usize) -> usize { a + b }
fn bar(a: usize, b: usize) -> usize { a * b }
fn test(x: usize) -> Func {
    if x % 2 == 0 { foo }
    else { bar }
}

const FOO: Func = foo;
const BAR: Func = bar;

fn main() {
    match test(std::env::consts::ARCH.len()) {
        FOO => println!("foo"), //~ ERROR behave unpredictably
        BAR => println!("bar"), //~ ERROR behave unpredictably
        _ => unreachable!(),
    }
}