Make throw an expression

tests/language/throw_expr_test.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Dart test program for testing throw expressions.
+
+void test1() {
+  var x = 6;
+  try {
+    throw x = 10;
+    x = 0;
+  } catch(e) {
+    Expect.equals(10, e);
+    Expect.equals(10, x);
+    x = 15;
+  }
+  Expect.equals(15, x);
+  x = 100;
+  try {
+    throw x++;
+    x = 0;
+  } catch(e) {
+    Expect.equals(100, e);
+    Expect.equals(101, x);
+    x = 150;
+  }
+  Expect.equals(150, x);
+}
+
+void test2() {
+  var x = 6;
+  try {
+    throw x + 4;
+  } catch(e) {
+    Expect.equals(10, e);
+    Expect.equals(6, x);
+    x = 15;
+  }
+  Expect.equals(15, x);
+}
+
+foo(x, y) => throw "foo" "$x";
+
+bar(x, y) => throw "foo" "${throw x}";
+
+class Q {
+  var qqq;
+  f(x) { qqq = x; }
+}
+
+void test3() {
+  try {
+    throw throw throw "throw";
+  } catch(e) {
+    Expect.equals("throw", e);
+  }

[siva, 2012/09/26 21:09:12]

I think the test will read much better if you changed the string to "up" instead
of "throw".

Also how about a try { throw 25 - throw 24; } catch (e) { }

+
+  var x = 10;
+  try {
+    foo(x = 12, throw 7);
+  } catch(e) {
+    Expect.equals(7, e);
+    Expect.equals(12, x);
+  }
+
+  x = 10;
+  try {
+    foo(x++, 10);
+  } catch(e) {
+    Expect.equals("foo10", e);
+    Expect.equals(11, x);
+  }
+
+  x = 100;
+  try {
+    bar(++x, 10);
+  } catch(e) {
+    Expect.equals(101, e);
+    Expect.equals(101, x);
+  }
+
+  x = null;
+  try {
+    x = new Q();
+    x..f(11) ..qqq = throw 77 ..f(22);
+  } catch(e) {
+    Expect.equals(77, e);
+    Expect.equals(11, x.qqq);
+  }
+}
+
+main() {
+  test1();
+  test2();
+  test3();
+}