Fix a bug where registers were shared

lib/handlebars/compiler/compiler.js

@@ -393,14 +393,14 @@ Handlebars.JavaScriptCompiler = function() {};
       this.isChild = !!context;
       this.context = context || {
         programs: [],
-        aliases: { },
-        registers: {list: []}
+        aliases: { }
       };
 
       this.preamble();
 
       this.stackSlot = 0;
       this.stackVars = [];
+      this.registers = { list: [] };
       this.compileStack = [];
 
       this.compileChildren(environment, options);
@@ -456,10 +456,7 @@ Handlebars.JavaScriptCompiler = function() {};
     },
 
     createFunctionContext: function(asObject) {
-      var locals = this.stackVars;
-      if (!this.isChild) {
-        locals = locals.concat(this.context.registers.list);
-      }
+      var locals = this.stackVars.concat(this.registers.list);
 
       if(locals.length > 0) {
         this.source[1] = this.source[1] + ", " + locals.join(", ");
@@ -854,9 +851,9 @@ Handlebars.JavaScriptCompiler = function() {};
     },
 
     useRegister: function(name) {
-      if(!this.context.registers[name]) {
-        this.context.registers[name] = true;
-        this.context.registers.list.push(name);
+      if(!this.registers[name]) {
+        this.registers[name] = true;
+        this.registers.list.push(name);
       }
     },