properly handle multiple subexpressions in the same hash, fixes #748

push all hash params before popping any so as to avoid the last stackN var
stomping previous ones

lib/handlebars/compiler/compiler.js

@@ -188,15 +188,15 @@ Compiler.prototype = {
   },
 
   hash: function(hash) {
-    var pairs = hash.pairs, pair;
+    var pairs = hash.pairs, i, l;
 
     this.opcode('pushHash');
 
-    for(var i=0, l=pairs.length; i<l; i++) {
-      pair = pairs[i];
-
-      this.pushParam(pair[1]);
-      this.opcode('assignToHash', pair[0]);
+    for(i=0, l=pairs.length; i<l; i++) {
+      this.pushParam(pairs[i][1]);
+    }
+    while(i--) {
+      this.opcode('assignToHash', pairs[i][0]);
     }
     this.opcode('popHash');
   },

lib/handlebars/compiler/javascript-compiler.js

@@ -606,11 +606,10 @@ JavaScriptCompiler.prototype = {
 
   // [assignToHash]
   //
-  // On stack, before: value, hash, ...
-  // On stack, after: hash, ...
+  // On stack, before: value, ..., hash, ...
+  // On stack, after: ..., hash, ...
   //
-  // Pops a value and hash off the stack, assigns `hash[key] = value`
-  // and pushes the hash back onto the stack.
+  // Pops a value off the stack and assigns it to the current hash
   assignToHash: function(key) {
     var value = this.popStack(),
         context,