private static int hash(TypeMirror mirror, Set<Element> visiting) {
        return mirror == null ? 0 : mirror.accept(HASH_VISITOR, visiting);
    }
Utilities related to {@link TypeMirror} instances.

@author Gregory Kick
@since 2.0
android/annotation_processors/permission-requester-compiler/src/main/java/github/tornaco/permission/compiler/common/MoreTypes.java