Fix names with '$' to not conflict with operators or internal helpers

frog/type.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.
 
 class Type extends Element {
   bool isTested = false;
   bool isChecked = false;
 
   /**
    * For core types (int, String, etc) this is the generated type assertion
@@ skipping 48 matching lines @@
 
   // True for all types in the Dart type system. We track non-nullabiltity
   // as an optimization for booleans to generate better code in checked mode.
   bool get isNullable() => true;
 
   // Strangely Dart treats calls on Function much like calls on var.
   bool get isVarOrFunction() => isVar || isFunction;
 
   bool get isVarOrObject() => isVar || isObject;
 
-  /** Gets the $call method for a function type. */
+  /** Gets the :call method for a function type. */
   MethodMember getCallMethod() => null;
 
   /** These types may not be implemented or extended by user code. */
   bool get isClosed() => isString || isBool || isNum || isFunction || isVar;
 
   bool get isUsed() => false;
 
   bool get isGeneric() => false;
 
   bool get isHiddenNativeType() => false;
@@ skipping 31 matching lines @@
     if (parentMember != null) {
       // TODO(jimhug): Ensure that this is only done once.
       if (!member.isPrivate || member.library == parentMember.library) {
         member.override(parentMember);
       }
     }
   }
 
   Member _createNotEqualMember() {
     // Add a != method just like the == one.
-    MethodMember eq = members['\$eq'];
+    MethodMember eq = members[':eq'];
     if (eq == null) {
       world.internalError('INTERNAL: object does not define ==',
         definition.span);
     }
-    final ne = new MethodMember('\$ne', this, eq.definition);
+    final ne = new MethodMember(':ne', this, eq.definition);
     ne.isGenerated = true;
     ne.returnType = eq.returnType;
     ne.parameters = eq.parameters;
     ne.isStatic = eq.isStatic;
     ne.isAbstract = eq.isAbstract;
     // TODO - What else to fill in?
     return ne;
   }
 
   Member _getMemberInParents(String memberName) {
     // print('getting $memberName in parents of $name, $isClass');
     // Now look in my parents.
     if (isClass) {
       if (parent != null) {
         return parent.getMember(memberName);
       } else if (isObject) {  // Could also be a top type so need check.
         // Create synthetic != method if needed.
-        if (memberName == '\$ne') {
+        if (memberName == ':ne') {
           var ret = _createNotEqualMember();
           members[memberName] = ret;
           return ret;
         }
         return null;
       }
     } else {
       // TODO(jimhug): Will probably check types more than once - errors?
       if (interfaces != null && interfaces.length > 0) {
         for (var i in interfaces) {
@@ skipping 625 matching lines @@
     else if (isNum) return 'number';
     else if (isString) return 'string';
     else if (isFunction) return 'function';
     else return null;
   }
 
   // TODO(jimhug): Reconcile different number types on JS.
   bool get isNum() {
     return library != null && library.isCore &&
       (name == 'num' || name == 'int' || name == 'double');