[strong] Declaration-after-use errors.

test/mjsunit/strong/declaration-after-use.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --strong-mode --harmony_rest_parameters --harmony_arrow_functions
+
+(function DeclarationAfterUse() {

[rossberg, 2015/02/23 13:45:26]

More tests would be great, both positive and negative. In particular:

- different combinations of multi-bindings with uses on the RHS
- class declarations referring to themselves in different parts
- for loops

[marja, 2015/02/24 13:29:35]

Added some tests here, probably not everything you had in mind.

+  assertThrows("'use strong'; x; let x = 0;", ReferenceError);
+  assertThrows("function f() { 'use strong'; x; let x = 0; } f();",
+               ReferenceError);
+  assertThrows("'use strong'; function f() { x; } let x = 0; f();",
+               ReferenceError);
+  assertThrows("function f() { 'use strong'; x; } var x = 0; f();",
+               ReferenceError);
+  // Errors are also detected when the declaration and the use are in the same
+  // eval scope.
+  assertThrows("'use strong'; eval('x; let x = 0;')", ReferenceError);
+})();
+
+
+(function UsesWhichAreFine() {
+  "use strong";
+
+  let var1 = 0;
+  var1;
+
+  for (let var2 = 0; var2 < 1; var2++) {
+    var2;
+  }
+
+  let var3 = 5;
+  for (; var3 < 10; ++var3) { }
+
+  let arr = [1, 2];
+  for (let i of arr) {
+    i;
+  }
+
+  try {
+    throw "error";
+  } catch (e) {
+    e;
+  }
+
+  function func1() { func1; this; }
+  func1();
+  func1;
+
+  function * func2() { func2; this; }
+  func2();
+  func2;
+
+  function func4(p, ...rest) { p; rest; this; func2; }
+  func4();
+
+  let func5 = (p1, p2) => { p1; p2 };
+  func5();
+
+  (function eval1() {
+    let var4 = 0; // Declaration position will be something large.
+    // But use position will be something small, however, this is not an error,
+    // since the use is inside an eval scope.
+    eval("var4;");
+  })();
+})();