ExternalLocation getExternalLocation(Program program, String[] path) {
		int nameIndex = path.length - 1;
		Namespace namespace = getExternalNamespace(program, path, path.length - 1);

		List<Symbol> symbols = program.getSymbolTable().getSymbols(path[nameIndex], namespace);
		if (symbols.size() != 1) {
			return null;
		}
		ExternalManager externalManager = program.getExternalManager();
		return externalManager.getExternalLocation(symbols.get(0));
	}
Changes the function's parameter indicated by index to be a stack
parameter with the indicated stack offset.
@param func the function
@param index the index of an existing parameter
@param stackOffset the stack offset for this parameter
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/AbstractExternalMergerTest.java