Tolerate expansions in vardefs, too!

lib/ast.js

@@ -363,14 +363,10 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     }
 }, AST_Scope);
 
-// TODO besides parameters and function calls, expansions can go in
-// arrays, array destructuring parameters, and array destructuring
-// assignment. But I'm not adding this right now because I'm trying
-// to do the most minimal and independent changesets.
-var AST_Expansion = DEFNODE("AST_Expansion", "symbol", {
-    $documentation: "An expandible argument, such as ...rest",
+var AST_Expansion = DEFNODE("Expansion", "symbol", {
+    $documentation: "An expandible argument, such as ...rest, a splat, such as [1,2,...all], or an expansion in a variable declaration, such as var [first, ...rest] = list",
     $propdoc: {
-        symbol: "AST_SymbolFunarg the name of the argument as a SymbolFunarg"
+        symbol: "AST_Symbol the thing to be expanded"
     },
     _walk: function(visitor) {
         var self = this;