{"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
    let ret = f16_to_f32(fx, value);
fn f16_to_f64(fx: &mut FunctionCx<'_, '_, '_>, value: Value) -> Value {
    fx.bcx.ins().fpromote(types::F64, ret)