1 files changed, 147 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/destructuring-rest.js b/js/src/jit-test/tests/basic/destructuring-rest.js
new file mode 100644
index 0000000000..fcb7b79bba
--- /dev/null
+++ b/js/src/jit-test/tests/basic/destructuring-rest.js
@@ -0,0 +1,147 @@
+
+load(libdir + 'asserts.js');
+load(libdir + 'eqArrayHelper.js');
+
+assertThrowsInstanceOf(() => new Function('[...a, ,] = []'), SyntaxError, 'trailing elision');
+assertThrowsInstanceOf(() => new Function('[a, ...b, c] = []'), SyntaxError, 'trailing param');
+assertThrowsInstanceOf(() => new Function('[...a=b] = []'), SyntaxError, 'assignment expression');
+assertThrowsInstanceOf(() => new Function('[...a()] = []'), SyntaxError, 'call expression');
+assertThrowsInstanceOf(() => new Function('[...(a,b)] = []'), SyntaxError, 'comma expression');
+assertThrowsInstanceOf(() => new Function('[...a++] = []'), SyntaxError, 'postfix expression');
+assertThrowsInstanceOf(() => new Function('[...!a] = []'), SyntaxError, 'unary expression');
+assertThrowsInstanceOf(() => new Function('[...a+b] = []'), SyntaxError, 'binary expression');
+assertThrowsInstanceOf(() => new Function('var [...a.x] = []'), SyntaxError, 'lvalue expression in declaration');
+assertThrowsInstanceOf(() => new Function('var [...(b)] = []'), SyntaxError);
+assertThrowsInstanceOf(() => new Function('[...b,] = []'), SyntaxError);
+
+assertThrowsInstanceOf(() => {
+  try {
+    eval('let [...[...x]] = (() => { throw "foo"; } )();');
+  } catch(e) {
+    assertEq(e, "foo");
+  }
+  x;
+}, ReferenceError);
+
+var inputArray = [1, 2, 3];
+var inputDeep = [1, inputArray];
+var inputObject = {a: inputArray};
+var inputStr = 'str';
+function *inputGenerator() {
+  yield 1;
+  yield 2;
+  yield 3;
+}
+
+var o = {prop: null, call: function () { return o; }};
+
+var expected = [2, 3];
+var expectedStr = ['t', 'r'];
+
+function testAll(fn) {
+  testDeclaration(fn);
+
+  o.prop = null;
+  assertEqArray(fn('[, ...(o.prop)]', inputArray, 'o.prop'), expected);
+  o.prop = null;
+  assertEqArray(fn('[, ...(o.call().prop)]', inputArray, 'o.prop'), expected);
+
+  o.prop = null;
+  assertEqArray(fn('[, ...[...(o.prop)]]', inputArray, 'o.prop'), expected);
+  o.prop = null;
+  assertEqArray(fn('[, ...[...(o.call().prop)]]', inputArray, 'o.prop'), expected);
+}
+function testDeclaration(fn) {
+  testStr(fn);
+
+  assertEqArray(fn('[, ...rest]', inputArray), expected);
+  assertEqArray(fn('[, ...rest]', inputGenerator()), expected);
+  assertEqArray(fn('[, [, ...rest]]', inputDeep), expected);
+  assertEqArray(fn('{a: [, ...rest]}', inputObject), expected);
+
+  assertEqArray(fn('[, ...[...rest]]', inputArray), expected);
+  assertEqArray(fn('[, ...[...rest]]', inputGenerator()), expected);
+  assertEqArray(fn('[, [, ...[...rest]]]', inputDeep), expected);
+  assertEqArray(fn('{a: [, ...[...rest]]}', inputObject), expected);
+
+  assertEqArray(fn('[, ...{0: a, 1: b}]', inputArray, '[a, b]'), expected);
+  assertEqArray(fn('[, ...{0: a, 1: b}]', inputGenerator(), '[a, b]'), expected);
+  assertEqArray(fn('[, [, ...{0: a, 1: b}]]', inputDeep, '[a, b]'), expected);
+  assertEqArray(fn('{a: [, ...{0: a, 1: b}]}', inputObject, '[a, b]'), expected);
+}
+
+function testStr(fn) {
+  assertEqArray(fn('[, ...rest]', inputStr), expectedStr);
+
+  assertEqArray(fn('[, ...[...rest]]', inputStr), expectedStr);
+
+  assertEqArray(fn('[, ...{0: a, 1: b}]', inputStr, '[a, b]'), expectedStr);
+}
+
+function testForIn(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function('input',
+    'for (var ' + pattern + ' in {[input]: 1}) {}' +
+    'return ' + binding
+  )(input);
+}
+testStr(testForIn);
+
+function testVar(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function('input',
+    'var ' + pattern + ' = input;' +
+    'return ' + binding
+  )(input);
+}
+testDeclaration(testVar);
+
+function testGlobal(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function('input',
+    '(' + pattern + ' = input);' +
+    'return ' + binding
+  )(input);
+}
+testAll(testGlobal);
+
+function testClosure(pattern, input, binding) {
+  binding = binding || 'rest';
+  const decl = binding.replace('[', '').replace(']', '');
+  return new Function('input',
+    'var ' + decl + '; (function () {' +
+    '(' + pattern + ' = input);' +
+    '})();' +
+    'return ' + binding
+  )(input);
+}
+testDeclaration(testClosure);
+
+function testArgument(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function('input',
+    'return (function (' + pattern + ') {' +
+    'return ' + binding + '; })(input);'
+  )(input);
+}
+testDeclaration(testArgument);
+
+function testArgumentFunction(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function(pattern,
+    'return ' + binding
+  )(input);
+}
+// ES6 requires the `Function` constructor to accept arbitrary
+// `BindingElement`s as formal parameters.
+testDeclaration(testArgumentFunction);
+
+function testThrow(pattern, input, binding) {
+  binding = binding || 'rest';
+  return new Function('input',
+    'try { throw input }' +
+    'catch(' + pattern + ') {' +
+    'return ' + binding + '; }'
+  )(input);
+}
+testDeclaration(testThrow);