fixes the "not used in definition context" error in define/contract

related to PR 12863, but doesn't solve the infinite loop problem
(cherry picked from commit 774e254f3c)

collects/racket/contract/private/provide.rkt

@@ -799,8 +799,8 @@
 (define-syntax (provide/contract stx)
   (define s-l-c (syntax-local-context))
   (case s-l-c
-   [(module-begin) ;; the case under discussion
-    #`(begin (define-values () (values))  ;; force us into the 'module' local context
+   [(module-begin)
+    #`(begin ;; force us into the 'module' local context
              #,stx)]
    [(module) ;; the good case
     (true-provide/contract stx #f 'provide/contract)]

collects/racket/contract/region.rkt

@@ -46,10 +46,18 @@
 ;                                          ;                                                         
 ;                                                                                                    
 
+(define-syntax (define/contract stx)
+  (define s-l-c (syntax-local-context))
+  (case s-l-c
+    [(module-begin)
+     #`(begin #,stx)]
+    [else
+     (define/contract-expander stx)]))
+
 ;; (define/contract id contract expr)
 ;; defines `id' with `contract'; initially binding
 ;; it to the result of `expr'.  These variables may not be set!'d.
-(define-syntax (define/contract define-stx)
+(define-for-syntax (define/contract-expander define-stx)
   (define-splicing-syntax-class fv-clause
     #:description "a free variable clause"
     #:attributes ([var 1] [ctc 1])