core/src/com/google/inject/Key.java
public static <T> Key<T> get(TypeLiteral<T> typeLiteral, Annotation annotation) {
    return new Key<T>(typeLiteral, strategyFor(annotation));
  }
public static <T> Key<T> get(TypeLiteral<T> typeLiteral, Annotation annotation) {
    return new Key<T>(typeLiteral, strategyFor(annotation));
  }
Gets a key for an injection type and an annotation.