rust/tests/mir-opt/instsimplify/combine_array_len.rs

// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
// unit-test: InstSimplify

// EMIT_MIR combine_array_len.norm2.InstSimplify.diff
fn norm2(x: [f32; 2]) -> f32 {
    // CHECK-LABEL: fn norm2(
    // CHECK-NOT: Len(
    let a = x[0];
    let b = x[1];
    a*a + b*b
}

fn main() {
    assert_eq!(norm2([3.0, 4.0]), 5.0*5.0);
}