Fix multiple hash handling in subexpressions

lib/handlebars/compiler/javascript-compiler.js

@@ -76,6 +76,7 @@ JavaScriptCompiler.prototype = {
     this.stackSlot = 0;
     this.stackVars = [];
     this.registers = { list: [] };
+    this.hashes = [];
     this.compileStack = [];
     this.inlineStack = [];
 
@@ -415,11 +416,14 @@ JavaScriptCompiler.prototype = {
     }
   },
   pushHash: function() {
+    if (this.hash) {
+      this.hashes.push(this.hash);
+    }
     this.hash = {values: [], types: [], contexts: []};
   },
   popHash: function() {
     var hash = this.hash;
-    this.hash = undefined;
+    this.hash = this.hashes.pop();
 
     if (this.options.stringParams) {
       this.push('{' + hash.contexts.join(',') + '}');

spec/subexpressions.js

@@ -76,7 +76,7 @@ describe('subexpressions', function() {
   });
 
   it("as hashes", function() {
-    var string   = '{{blog fun=(equal true true)}}';
+    var string   = '{{blog fun=(equal (blog fun=1) "val is 1")}}';
 
     var helpers  = {
       blog: function(options) {