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// Can't assign to const is a runtime TypeError
load(libdir + 'asserts.js');
function assertTypeError(str) {
assertThrowsInstanceOf(function () { eval(str); }, TypeError);
}
assertTypeError("(function() { const x = 3; (() => x++)(); return x })()");
assertTypeError("(function() { const x = 3; (() => x++)(); return x++ })()");
assertTypeError("(function() { const x = 2; (() => x++)(); return ++x })()");
assertTypeError("(function() { const x = 2; (() => x++)(); return x += 1 })()");
assertTypeError("(function() { const x = 3; x = 1; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; x = 1; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; x++; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; ++x; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; x--; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; --x; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; x += 1; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; x -= 1; return (function() { return x})() })()");
assertTypeError("(function() { const x = 3; [x] = [1]; })()");