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

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

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
index afd2a0bbaac0ac509423f8ccc5c64c0452250ae5..48a4c02872f9ff4c0695d38b9fade8db966cb0f1 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
@@ -1301,7 +1301,7 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
           Node node = member.parseNode(compiler);
           SendSet assignment = node.asSendSet();
           HInstruction value;
-          if (assignment === null) {
+          if (assignment == null) {
             value = graph.addConstantNull(constantSystem);
           } else {
             Node right = assignment.arguments.head;
@@ -1465,7 +1465,7 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
       // }
       //
       // foo([a = 42]) {
-      //   var t1 = a === sentinel;
+      //   var t1 = identical(a, sentinel);
       //   if (t1) a = 42;
       //   if (!t1) print('parameter passed ' + a);
       // }