in src/get_path_for_type.hack [16:25]
function get_path_for_type(
IPathProvider<?string> $p,
string $name,
): ?string {
return $p->getPathForClass($name) ??
$p->getPathForInterface($name) ??
$p->getPathForTrait($name) ??
$p->getPathForTransparentTypeAlias($name) ??
$p->getPathForOpaqueTypeAlias($name);
}