gcc/testsuite/rust/compile/issues/407-2.rs

// #407
#![feature(no_core)]
#![no_core]

pub fn loopy()  {
    let mut a = 1;
    loop {
        if a < 40 {
            a + = 1; // { dg-error "found unexpected token '=' in null denotation" }
        } else {
            break;
        }
    }
}