public String getBackref(int index) {
		SymbolNode backref = backrefs.get(index);
		if (backref != null) {
			return backref.toString();
		}

		return "{backref " + index + "}";
	}
Gets the backref at a certain index
@param index the index of he backref to return
@return the backref object
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/analysis/rust/demangler/RustDemanglerV0.java