Generator objects can suspend

test/mjsunit/harmony/generators-parsing.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
 
 // Yield statements.
 function* g() { yield 3; yield 4; }
 
 // Yield expressions.
 function* g() { (yield 3) + (yield 4); }
 
 // You can have a generator in strict mode.
 function* g() { "use strict"; yield 3; yield 4; }
 
+// Generators can have return statements also, which internally parse to a kind
+// of yield expression.
+function* g() { yield 1; return; }
+function* g() { yield 1; return 2; }
+function* g() { yield 1; return 2; yield "dead"; }
+
 // Generator expression.
 (function* () { yield 3; });
 
 // Named generator expression.
 (function* g() { yield 3; });
 
 // A generator without a yield is specified as causing an early error.  This
 // behavior is currently unimplemented.  See
 // https://bugs.ecmascript.org/show_bug.cgi?id=1283.
 function* g() { }
@@ skipping 40 matching lines @@
 assertThrows("function* g() { yield 3 + yield 4; }", SyntaxError);
 
 // Yield is still a future-reserved-word in strict mode
 assertThrows("function f() { \"use strict\"; var yield = 13; }", SyntaxError);
 
 // The name of the NFE is let-bound in G, so is invalid.
 assertThrows("function* g() { yield (function yield() {}); }", SyntaxError);
 
 // In generators, yield is invalid as a formal argument name.
 assertThrows("function* g(yield) { yield (10); }", SyntaxError);