feat: 9.5.9

s/primref.ss

@@ -0,0 +1,23 @@
+;;; primref.ss
+;;; Copyright 1984-2017 Cisco Systems, Inc.
+;;; 
+;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;; you may not use this file except in compliance with the License.
+;;; You may obtain a copy of the License at
+;;; 
+;;; http://www.apache.org/licenses/LICENSE-2.0
+;;; 
+;;; Unless required by applicable law or agreed to in writing, software
+;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;; See the License for the specific language governing permissions and
+;;; limitations under the License.
+
+(define-record-type primref
+  (nongenerative #{primref a0xltlrcpeygsahopkplcn-2})
+  (sealed #t)
+  (fields name flags arity))
+
+(define primref-level
+  (lambda (pr)
+    (if (all-set? (prim-mask unsafe) (primref-flags pr)) 3 2)))