src/v8/test/message/fail/arrow-formal-parameters.out - cobalt - Git at Google

 *%(basename)s:5: SyntaxError: Duplicate parameter name not allowed in this context
 (b, a, a, d) => a
        ^
 SyntaxError: Duplicate parameter name not allowed in this context
	*%(basename)s:5: SyntaxError: Duplicate parameter name not allowed in this context
	(b, a, a, d) => a
	^
	SyntaxError: Duplicate parameter name not allowed in this context