@Override
	public boolean equals(final Object obj) {
		return obj == this ||
			obj instanceof TreeMatchResult<?> other &&
			_tree.equals(other._tree) &&
			_vars.equals(other._vars);
	}
The variables involved while matching the tree {@link #tree()}.

@return variables involved while matching the tree {@link #tree()}.
jenetics.ext/src/main/java/io/jenetics/ext/rewriting/TreeMatchResult.java