Function constant

tests/binary/fn_pointers/src/main.rs:91–93

(_x: f64)

}

fn constant(_x: f64) -> f64 {
    42.0
}

fn combine(f: fn(i32, i32) -> i32, a: i32, b: i32) -> i32 {
    f(a, b) + f(b, a)