core/src/com/google/inject/internal/ConstructorBindingImpl.java
private static boolean hasAtInject(Constructor cxtor) {
    return cxtor.isAnnotationPresent(Inject.class)
        || cxtor.isAnnotationPresent(javax.inject.Inject.class);
  }
private static boolean hasAtInject(Constructor cxtor) {
    return cxtor.isAnnotationPresent(Inject.class)
        || cxtor.isAnnotationPresent(javax.inject.Inject.class);
  }
Returns true if the inject annotation is on the constructor.