michael@0: // Test interactions between ES6 generators and not-yet-standard
michael@0: // features.
michael@0: 
michael@0: function assertSyntaxError(str) {
michael@0:     var msg;
michael@0:     var evil = eval;
michael@0:     try {
michael@0:         // Non-direct eval.
michael@0:         evil(str);
michael@0:     } catch (exc) {
michael@0:         if (exc instanceof SyntaxError)
michael@0:             return;
michael@0:         msg = "Assertion failed: expected SyntaxError, got " + exc;
michael@0:     }
michael@0:     if (msg === undefined)
michael@0:         msg = "Assertion failed: expected SyntaxError, but no exception thrown";
michael@0:     throw new Error(msg + " - " + str);
michael@0: }
michael@0: 
michael@0: // Destructuring binding.
michael@0: assertSyntaxError("function* f(x = yield) {}");
michael@0: assertSyntaxError("function* f(x = yield 17) {}");
michael@0: assertSyntaxError("function* f([yield]) {}");
michael@0: assertSyntaxError("function* f({ yield }) {}");
michael@0: assertSyntaxError("function* f(...yield) {}");
michael@0: 
michael@0: // For each.
michael@0: assertSyntaxError("for yield");
michael@0: assertSyntaxError("for yield (;;) {}");
michael@0: assertSyntaxError("for yield (x of y) {}");
michael@0: assertSyntaxError("for yield (var i in o) {}");
michael@0: 
michael@0: // Expression bodies.
michael@0: assertSyntaxError("function* f() yield 7");