Rename unstable/wrapc to syntax/contract.

racket/collects/data/queue.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require racket/contract/base
          (for-syntax racket/base
-                     unstable/wrapc))
+                     syntax/contract))
 
 ;; A Queue contains a linked list with mutable cdrs, holding two pointers
 ;; to the head and the tail -- where items are pulled from the head and

racket/collects/syntax/parse/experimental/contract.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require syntax/parse/pre
          "provide.rkt"
-         unstable/wrapc
+         syntax/contract
          (only-in syntax/parse/private/residual ;; keep abs. path
                   this-context-syntax
                   this-role)

racket/collects/syntax/parse/experimental/provide.rkt

@@ -8,7 +8,7 @@
                      syntax/parse/pre
                      syntax/parse/private/residual-ct ;; keep abs. path
                      "../private/kws.rkt"
-                     unstable/wrapc))
+                     syntax/contract))
 (provide provide-syntax-class/contract
          syntax-class/c
          splicing-syntax-class/c)