@Override
	public int hashCode() {
		int hash = MurmurHash.initialize();
		hash = MurmurHash.update(hash, name);
		hash = MurmurHash.update(hash, getArgType());
		hash = MurmurHash.finish(hash, 2);
		return hash;
	}
Not used for output; just used to distinguish between decl types
 to avoid dups.
tool/src/org/antlr/v4/codegen/model/decl/ContextGetterDecl.java