test/mjsunit/regress/regress-1620.js

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// Don't allow malformed unicode escape sequences in identifiers.
// In strings and regexps we currently allow malformed unicode escape
// sequences without throwing a SyntaxError. Instead "\u22gk" would
// treat the "\u" as an identity escape, and evaluate to "u22gk".
// Due to code sharing, we did the same in identifiers. This should
// no longer be the case.
// See: http://code.google.com/p/v8/issues/detail?id=1620

assertThrows("var \\u\\u\\u = 42;");
assertThrows("var \\u41 = 42;");
assertThrows("var \\u123 = 42;");
eval("var \\u1234 = 42;");
assertEquals(42, eval("\u1234"));
assertThrows("var uuu = 42; var x = \\u\\u\\u");

// Regressions introduced and fixed again while fixing the above.

// Handle 0xFFFD correctly (it's a valid value, and shouldn't be used
// to mark an error).
assertEquals(0xFFFD, "\uFFFD".charCodeAt(0));

// Handle unicode escapes in regexp flags correctly.
assertThrows("/x/g\\uim", SyntaxError);
assertThrows("/x/g\\u2im", SyntaxError);
assertThrows("/x/g\\u22im", SyntaxError);
assertThrows("/x/g\\u222im", SyntaxError);
assertThrows("/x/g\\\\u2222im", SyntaxError);