Handle builtins in declarations

Author: dy

lib/expr.js

@@ -85,7 +85,7 @@ prefix('(', function() {
   this.type = 'group'
   this.children = [expression(0)]
   advance(')')
-  return this 
+  return this
 })
 prefix('++')
 prefix('--')
@@ -142,7 +142,7 @@ function symbol(id, binding_power) {
     }
   } else {
     sym = Object.create(original_symbol)
-    sym.id = id 
+    sym.id = id
     sym.lbp = binding_power
     symbol_table[id] = sym
   }

lib/index.js

@@ -504,7 +504,7 @@ function parser() {
   function parse_decllist() {
     // grab ident
 
-    if(token.type === 'ident') {
+    if(token.type === 'ident' || token.type === 'builtin') {
       var name = token.data
       state.unshift(ident())
       state.scope.define(name)
@@ -560,7 +560,7 @@ function parser() {
   }
 
   function parse_ident() {
-    if(token.type !== 'ident') {
+    if(token.type !== 'ident' && token.type !== 'builtin') {
       return unexpected('expected user-defined name, got '+token.data)
     }