Make node for each var assignment in JS grammar

spec/runtime/languages/javascript/control_flow.txt

@@ -7,9 +7,9 @@ secondFunction(x);
 ---
 (program
     (var_declaration
-        (identifier) (object)
+        (var_assignment (identifier) (object))
         (identifier)
-        (identifier) (number))
+        (var_assignment (identifier) (number)))
     (expression_statement (function_call (identifier) (identifier)))
     (expression_statement (function_call (identifier) (identifier))))
 
@@ -62,7 +62,7 @@ for (var i = 1; someCondition(i); i = next()) {
 }
 ---
 (for_statement
-    (var_declaration (identifier) (number))
+    (var_declaration (var_assignment (identifier) (number)))
     (expression_statement (function_call (identifier) (identifier)))
     (assignment (identifier) (function_call (identifier)))
     (statement_block (expression_statement (function_call (identifier)))))

spec/runtime/languages/javascript/literals.txt

@@ -31,11 +31,12 @@ var x = {
     }
 };
 ---
-(var_declaration
+(var_declaration (var_assignment
     (identifier)
     (object (identifier) (function_expression
         (formal_parameters (identifier) (identifier))
-        (statement_block (var_declaration (identifier) (identifier))))))
+        (statement_block
+            (var_declaration (var_assignment (identifier) (identifier))))))))
 
 ==========================================
 parses comments
@@ -55,14 +56,16 @@ var thing = {
 ---
 (comment)
 (comment)
-(var_declaration (identifier) (object
-    (comment)
-    (comment)
-    (identifier) (function_expression
-        (formal_parameters (identifier) (comment))
-        (statement_block
-            (comment)
-            (expression_statement (function_call (identifier)))))))
+(var_declaration (var_assignment
+    (identifier)
+    (object
+        (comment)
+        (comment)
+        (identifier) (function_expression
+            (formal_parameters (identifier) (comment))
+            (statement_block
+                (comment)
+                (expression_statement (function_call (identifier))))))))
 
 ==========================================
 parses comments within expressions

spec/runtime/languages/javascript/operators.txt

@@ -12,13 +12,13 @@ parses constructor calls
 ==========================================
 var x = new Node(5, new Node(3, null));
 ---
-(var_declaration
+(var_declaration (var_assignment
     (identifier)
     (constructor_call (function_call (identifier)
         (number)
         (constructor_call (function_call (identifier)
             (number)
-            (null))))))
+            (null)))))))
 
 ==========================================
 parses property access with dot notation