Canonicalize bound closures for non-optional-arg methods.

tests/language/closure7_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.
+
+// Test that implicitly bound closures work correctly
+
+class A {
+  foo() => 499;
+  fooo() => 4999;  // Implicit closure class can be shared with foo.
+  bar(x, [y = 8, z = 10]) => "1 $x $y $z";
+  gee(x, [y = 9, z = 11]) => "2 $x $y $z";  // Must not be shared with "bar".
+  toto(x, [y = 8, z = 10]) => "3 $x $y $z";  // Could be shared with "bar".
+
+  fisk(x, [y = 8, zz = 10]) => "4 $x $y $zz";
+  titi(x, [y = 8, zz = 77]) => "5 $x $y $zz";  // Could be shared with "fisk",
+                                          // because default-val is never used.
+}
+
+class B {
+  // All implicit closures of B can be shared with their equivalent functions
+  // of A.
+  foo() => 4990;
+  fooo() => 49990;
+  bar(x, [y = 8, z = 10]) => "1B $x $y $z";
+  gee(x, [y = 9, z = 11]) => "2B $x $y $z";
+  toto(x, [y = 8, z = 10]) => "3B $x $y $z";
+  fisk(x, [y = 8, zz = 10]) => "4B $x $y $zz";
+  titi(x, [y = 8, zz = 77]) => "5B $x $y $zz";
+}
+
+
+tearOffFoo(o) => o.foo;
+tearOffFooo(o) => o.fooo;
+tearOffBar(o) => o.bar;
+tearOffGee(o) => o.gee;
+tearOffToto(o) => o.toto;
+tearOffFisk(o) => o.fisk;
+tearOffTiti(o) => o.titi;
+
+main() {
+  var a = new A();
+  var b = new B();
+  Expect.equals(499, tearOffFoo(a)());
+  Expect.equals(4990, tearOffFoo(b)());
+  Expect.equals(4999, tearOffFooo(a)());
+  Expect.equals(49990, tearOffFooo(b)());
+
+  var barA = tearOffBar(a);
+  var barB = tearOffBar(b);
+  var geeA = tearOffGee(a);
+  var geeB = tearOffGee(b);
+  var totoA = tearOffToto(a);
+  var totoB = tearOffToto(b);
+  Expect.equals("1 33 8 10", barA(33));
+  Expect.equals("1B 33 8 10", barB(33));
+  Expect.equals("2 33 9 11", geeA(33));
+  Expect.equals("2B 33 9 11", geeB(33));
+  Expect.equals("3 33 8 10", totoA(33));
+  Expect.equals("3B 33 8 10", totoB(33));
+
+  Expect.equals("1 35 8 10", barA(35));
+  Expect.equals("1B 35 8 10", barB(35));
+  Expect.equals("2 35 9 11", geeA(35));
+  Expect.equals("2B 35 9 11", geeB(35));
+  Expect.equals("3 35 8 10", totoA(35));
+  Expect.equals("3B 35 8 10", totoB(35));
+  
+  Expect.equals("1 35 8 77", barA(35, z: 77));
+  Expect.equals("1B 35 8 77", barB(35, z: 77));
+  Expect.equals("2 35 9 77", geeA(35, z: 77));
+  Expect.equals("2B 35 9 77", geeB(35, z: 77));
+  Expect.equals("3 35 8 77", totoA(35, z: 77));
+  Expect.equals("3B 35 8 77", totoB(35, z: 77));
+
+  Expect.equals("1 35 8 77", barA(35, z: 77));
+  Expect.equals("1B 35 8 77", barB(35, z: 77));
+  Expect.equals("2 35 9 77", geeA(35, z: 77));
+  Expect.equals("2B 35 9 77", geeB(35, z: 77));
+  Expect.equals("3 35 8 77", totoA(35, z: 77));
+  Expect.equals("3B 35 8 77", totoB(35, z: 77));
+
+  var fiskA = tearOffFisk(a);
+  var fiskB = tearOffFisk(b);
+  var titiA = tearOffTiti(a);
+  var titiB = tearOffTiti(b);
+
+  Expect.equals("4 311 8 987", fiskA(311, zz: 987));
+  Expect.equals("4B 311 8 987", fiskB(311, zz: 987));
+  Expect.equals("5 311 8 987", titiA(311, zz: 987));
+  Expect.equals("5B 311 8 987", titiB(311, zz: 987));
+
+  Expect.equals("4 311 765 987", fiskA(311, 765, 987));
+  Expect.equals("4B 311 765 987", fiskB(311, 765, 987));
+  Expect.equals("5 311 765 987", titiA(311, 765, 987));
+  Expect.equals("5B 311 765 987", titiB(311, 765, 987));
+}