fn build<'a>(
out: &'a mut HashMap<Unit, BuildScripts>,
cx: &mut Context<'_, '_>,
unit: &Unit
) -> CargoResult<&'a BuildScripts>
fn build<'a>(
out: &'a mut HashMap<Unit, BuildScripts>,
cx: &mut Context<'_, '_>,
unit: &Unit
) -> CargoResult<&'a BuildScripts>