@Override
	public void finalize() {
		if (!refClosed) {
			Msg.warn(this, "Unclosed FilesytemRef: " + fs.toString());
		}
	}
Returns true if this ref was {@link #close() closed}.

@return boolean true if this ref was closed.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileSystemRef.java