Dart SDK Spelling b, c, and d.

pkg/compiler/lib/src/js/placeholder_safety.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.
 
 library js.safety;
 
 import "js.dart" as js;
 
 typedef bool PositionPredicate(int position);
 
@@ skipping 149 matching lines @@
     }
     if (left is js.PropertyAccess) {
       // "a.b.x = c.y" gives a TypeError for null values in this order: `a`,
       // `c`, `a.b`.
       int receiver = visit(left.receiver);
       visit(left.selector);
       int value = visit(right);
       if (canBeNull(receiver)) safe = false;
       return value;
     }
-    // Be conserative with unrecognized LHS expressions.
+    // Be conservative with unrecognized LHS expressions.
     safe = false;
     return leftToRight();
   }
 
   int visitCall(js.Call node) {
     // TODO(sra): Recognize JavaScript built-ins like
     // 'Object.prototype.hasOwnProperty.call'.
     visit(node.target);
     node.arguments.forEach(visit);
     return unsafe(UNKNOWN_VALUE);
@@ skipping 137 matching lines @@
   int visitFun(js.Fun node) {
     bool oldSafe = safe;
     int oldNextPosition = nextPosition;
     visit(node.body);
     // Creating a function has no effect on order unless there are embedded
     // placeholders.
     safe = (nextPosition == oldNextPosition) && oldSafe;
     return NONNULL_VALUE;
   }
 }