v8/test/mjsunit/invalid-lhs.js

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// Test that we get exceptions for invalid left-hand sides.  The
// exceptions are delayed until runtime.

// Normal assignments:
assertThrows("12 = 12", SyntaxError);
assertThrows("x++ = 12", SyntaxError);
assertThrows("eval('var x') = 12", ReferenceError);
assertThrows("if (false) 12 = 12", SyntaxError);
assertDoesNotThrow("if (false) eval('var x') = 12");

// Pre- and post-fix operations:
assertThrows("12++", SyntaxError);
assertThrows("12--", SyntaxError);
assertThrows("++12", SyntaxError);
assertThrows("--12", SyntaxError);
assertThrows("++(eval('12'))", ReferenceError);
assertThrows("(eval('12'))++", ReferenceError);
assertThrows("if (false) 12++", SyntaxError);
assertThrows("if (false) 12--", SyntaxError);
assertThrows("if (false) ++12", SyntaxError);
assertThrows("if (false) --12", SyntaxError);
assertDoesNotThrow("if (false) ++(eval('12'))");
assertDoesNotThrow("if (false) (eval('12'))++");

// For in:
assertThrows("for (12 in [1]) print(12);", SyntaxError);
assertThrows("for (eval('var x') in [1]) print(12);", ReferenceError);
assertThrows("if (false) for (12 in [1]) print(12);", SyntaxError);
assertDoesNotThrow("if (false) for (eval('0') in [1]) print(12);");

// For:
assertThrows("for (12 = 1;;) print(12);", SyntaxError);
assertThrows("for (eval('var x') = 1;;) print(12);", ReferenceError);
assertThrows("if (false) for (12 = 1;;) print(12);", SyntaxError);
assertDoesNotThrow("if (false) for (eval('var x') = 1;;) print(12);");

// Assignments to 'this'.
assertThrows("this = 42", SyntaxError);
assertThrows("function f() { this = 12; }", SyntaxError);
assertThrows("for (this in {x:3, y:4, z:5}) ;", SyntaxError);
assertThrows("for (this = 0;;) ;", SyntaxError);
assertThrows("this++", SyntaxError);
assertThrows("++this", SyntaxError);
assertThrows("this--", SyntaxError);
assertThrows("--this", SyntaxError);
assertThrows("if (false) this = 42", SyntaxError);
assertThrows("if (false) this++", SyntaxError);