a === b -> identical(a, b)

sdk/lib/_internal/compiler/implementation/ssa/validate.dart

 // Copyright (c) 2011, 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.
 
 part of ssa;
 
 class HValidator extends HInstructionVisitor {
   bool isValid = true;
   HGraph graph;
 
@@ skipping 62 matching lines @@
     }
 
     // Check that the entries in the dominated-list are sorted.
     int lastId = 0;
     for (HBasicBlock dominated in block.dominatedBlocks) {
       if (!isValid) break;
       if (!identical(dominated.dominator, block)) {
         markInvalid("dominated block not pointing back");
       }
       if (dominated.id == null || dominated.id <= lastId) {
-        markInvalid("dominated.id === null or dominated has <= id");
+        markInvalid("dominated.id == null or dominated has <= id");
       }
       lastId = dominated.id;
     }
 
     if (!isValid) return;
     block.forEachPhi(visitInstruction);
 
     // Check that the blocks of the parameters of a phi are dominating the
     // corresponding predecessor block. Note that a block dominates
     // itself.
@@ skipping 78 matching lines @@
       markInvalid("Instruction in wrong block");
     }
     if (!hasCorrectInputs()) {
       markInvalid("Incorrect inputs");
     }
     if (!hasCorrectUses()) {
       markInvalid("Incorrect uses");
     }
   }
 }