Test for consistent errors for optimized forms of '-'.

tests/compiler/dart2js_extra/consistent_subtract_error_test.dart

+// Copyright (c) 2015, 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.
+
+import "package:expect/expect.dart";
+
+// Test that optimized '-' and slow path '-' produce the same error.
+
+@NoInline()
+@AssumeDynamic()
+confuse(x) => x;
+
+void check2(String name, name1, f1, name2, f2) {
+  Error trap(part, f) {
+    try {
+      f();
+    } catch (e) {
+      return e;
+    }
+    Expect.fail('should throw: $name.$part');
+  }
+  var e1 = trap(name1, f1);
+  var e2 = trap(name2, f2);
+  var s1 = '$e1';
+  var s2 = '$e2';
+  Expect.equals(s1, s2, '\n  $name.$name1: "$s1"\n  $name.$name2: "$s2"\n');
+}
+
+void check(String name, f1, f2, [f3, f4, f5, f6, f7]) {
+  check2(name, 'f1', f1, 'f2', f2);
+  if (f3 != null) check2(name, 'f1', f1, 'f3', f3);
+  if (f4 != null) check2(name, 'f1', f1, 'f4', f4);
+  if (f5 != null) check2(name, 'f1', f1, 'f5', f5);
+  if (f6 != null) check2(name, 'f1', f1, 'f6', f6);
+  if (f7 != null) check2(name, 'f1', f1, 'f7', f7);
+}
+
+class IntMinusNull {
+  static f1() {
+    return confuse(1) - confuse(null);
+  }
+
+  static f2() {
+    return confuse(1) - null;
+  }
+
+  static f3() {
+    return (confuse(1) as int) - confuse(null);
+  }
+
+  static f4() {
+    return (confuse(1) as int) - null;
+  }
+
+  static f5() {
+    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    return a - confuse(null);
+  }
+
+  static f6() {
+    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    return a - null;
+  }
+
+  static f7() {
+    return 1 - null;
+  }
+
+  static test() {
+    check('IntMinusNull', f1, f2, f3, f4, f5, f6, f7);
+  }
+}
+
+class IntMinusString {
+  static f1() {
+    return confuse(1) - confuse('a');
+  }
+
+  static f2() {
+    return confuse(1) - 'a';
+  }
+
+  static f3() {
+    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    return a - confuse('a');
+  }
+
+  static f4() {
+    return (confuse(1) as int) - confuse('a');
+  }
+
+  static f5() {
+    return (confuse(1) as int) - 'a';
+  }
+
+  static f6() {
+    var a = confuse(true) ? 1 : 2;  // Small int with unknown value.
+    return a - 'a';
+  }
+
+  static f7() {
+    return 1 - 'a';
+  }
+
+  static test() {
+    check('IntMinusString', f1, f2, f3, f4, f5, f6, f7);
+  }
+}
+
+main() {
+  IntMinusNull.test();
+  IntMinusString.test();
+}