Method copySet

src/main/java/matcher/Util.java:45–51

(Set<T> set)

	}

	public static <T> Set<T> copySet(Set<T> set) {
		if (set instanceof HashSet) {
			return new HashSet<>(set);
		} else {
			return newIdentityHashSet(set);
		}
	}

	public static String getStackTrace(Throwable t) {
		if (t == null) return null;