expander: fix problem with define shadowing require

When a `define` that shadows a `require` appears before the `require`,
then the `require` may fail to other, non-shadowed bindings from the
same `require` spec.

Thanks to Matthias for reporting the problem.

pkgs/racket-test-core/tests/racket/module.rktl

@@ -2762,6 +2762,35 @@ case of module-leve bindings; it doesn't cover local bindings.
                     (expand `(lambda (x) x))))))))
           ok?)))
 
+;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Make sure that an import that is already shadowed by a definition
+;; does not prevent importing other things
+
+;; We want enough bindings here to trigger bulk mode
+(module provides-a-through-m racket/base
+  (define a 1)
+  (define b 2)
+  (define c 3)
+  (define d 4)
+  (define e 5)
+  (define f 6)
+  (define g 7)
+  (define h 8)
+  (define i 9)
+  (define j 10)
+  (define k 11)
+  (define l 12)
+  (define m 13)
+  (provide a b c d e f g h i j k l m))
+
+(module shaodws-c-and-imports-the-rest racket/base
+  (define c -3)
+  (require (except-in 'provides-a-through-m a b d e))
+  (define result f)
+  (provide result))
+
+(test 6 dynamic-require ''shaodws-c-and-imports-the-rest 'result)
+
 ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (report-errs)

racket/src/expander/expand/require+provide.rkt

@@ -174,7 +174,7 @@
   (define sym-to-reqds (hash-ref! at-mod phase-shift make-hasheq))
   (define prefix-len (if bulk-prefix (string-length (symbol->string bulk-prefix)) 0))
   (define br (bulk-required provides prefix-len s provide-phase-level can-be-shadowed?))
-  (for/or ([(out-sym binding/p) (in-hash provides)]
+  (for/fold ([any-already-defined? #f]) ([(out-sym binding/p) (in-hash provides)]
                                          #:unless (not (symbol-interned? out-sym)))
     (when symbols-accum (hash-set! symbols-accum out-sym #t))
     (cond
@@ -206,7 +206,7 @@
            [else #f]))
        (unless already-defined?
          (hash-set! sym-to-reqds sym (cons-ish br (hash-ref sym-to-reqds sym null))))
-       already-defined?])))
+       (or any-already-defined? already-defined?)])))
 
 ;; Convert a combination of a symbol and `bulk-required` to a
 ;; `required` on demand

racket/src/racket/src/startup.inc

@@ -1882,7 +1882,7 @@ static const char *startup_source =
 " prop:stream"
 "(vector"
 "(lambda(v_0)"
-"(let-values(((cont?_2946)(range-ref v_0 2)))(if cont?_2946(not(cont?_2946(range-ref v_0 0))) #f)))"
+"(let-values(((cont?_3268)(range-ref v_0 2)))(if cont?_3268(not(cont?_3268(range-ref v_0 0))) #f)))"
 "(lambda(v_0)(range-ref v_0 0))"
 "(lambda(v_0)(make-range((range-ref v_0 1)(range-ref v_0 0))(range-ref v_0 1)(range-ref v_0 2)))))"
 "(cons"
@@ -1961,7 +1961,7 @@ static const char *startup_source =
 "(begin"
 "(begin"
 "(if(if(exact-nonnegative-integer? start_0)"
-"(let-values(((or-part_3061)(< start_0 len_0)))(if or-part_3061 or-part_3061(= len_0 start_0 stop_0)))"
+"(let-values(((or-part_3439)(< start_0 len_0)))(if or-part_3439 or-part_3439(= len_0 start_0 stop_0)))"
 " #f)"
 "(void)"
 "          (let-values () (raise-range-error who_0 \"vector\" \"starting \" start_0 vec_0 0 (sub1 len_0))))"
@@ -2001,11 +2001,11 @@ static const char *startup_source =
 "(begin"
 "(begin"
 "(if(vector?_0 vec_0)(void)(let-values()(raise-argument-error who_0 type-name_0 vec_0)))"
-"(let-values(((len_3070)(unsafe-vector-length_0 vec_0)))"
-"(let-values(((stop*_3071)(if stop_0 stop_0 len_3070)))"
+"(let-values(((len_3448)(unsafe-vector-length_0 vec_0)))"
+"(let-values(((stop*_3449)(if stop_0 stop_0 len_3448)))"
 "(begin"
-"(check-ranges who_0 vec_0 start_0 stop*_3071 step_0 len_3070)"
-"(values vec_0 start_0 stop*_3071 step_0))))))))"
+"(check-ranges who_0 vec_0 start_0 stop*_3449 step_0 len_3448)"
+"(values vec_0 start_0 stop*_3449 step_0))))))))"
 "(define-values"
 "(check-vector)"
 "  (lambda (v_0) (begin (if (vector? v_0) (void) (let-values () (raise-argument-error 'in-vector \"vector\" v_0))))))"
@@ -2035,15 +2035,15 @@ static const char *startup_source =
 "(grow-vector)"
 "(lambda(vec_0)"
 "(begin"
-"(let-values(((n_3387)(vector-length vec_0)))"
-"(let-values(((new-vec_3388)(make-vector(* 2 n_3387))))"
-"(begin(vector-copy! new-vec_3388 0 vec_0 0 n_3387) new-vec_3388))))))"
+"(let-values(((n_3765)(vector-length vec_0)))"
+"(let-values(((new-vec_3766)(make-vector(* 2 n_3765))))"
+"(begin(vector-copy! new-vec_3766 0 vec_0 0 n_3765) new-vec_3766))))))"
 "(define-values"
 "(shrink-vector)"
 "(lambda(vec_0 i_0)"
 "(begin"
-"(let-values(((new-vec_3391)(make-vector i_0)))"
-"(begin(vector-copy! new-vec_3391 0 vec_0 0 i_0) new-vec_3391)))))"
+"(let-values(((new-vec_3769)(make-vector i_0)))"
+"(begin(vector-copy! new-vec_3769 0 vec_0 0 i_0) new-vec_3769)))))"
 "(define-values"
 "(map2)"
 "(let-values(((map_4)"
@@ -21957,7 +21957,7 @@ static const char *startup_source =
 "(void)"
 "(let-values()(check-in-hash ht_386)))"
 "((letrec-values(((for-loop_387)"
-"(lambda(result_0 i_0)"
+"(lambda(any-already-defined?_0 i_0)"
 "(begin"
 " 'for-loop"
 "(if i_0"
@@ -21966,16 +21966,16 @@ static const char *startup_source =
 "(hash-iterate-key+value"
 " ht_386"
 " i_0)))"
-"(let-values(((result_392)"
-"(let-values(((result_393)"
-" result_0))"
+"(let-values(((any-already-defined?_392)"
+"(let-values(((any-already-defined?_393)"
+" any-already-defined?_0))"
 "(if(not"
 "(symbol-interned?"
 " out-sym_390))"
-" result_393"
-"(let-values()"
-"(let-values(((result_395)"
-"(let-values()"
+" any-already-defined?_393"
+"(let-values(((any-already-defined?_394)"
+" any-already-defined?_393))"
+"(let-values(((any-already-defined?_395)"
 "(let-values()"
 "(begin"
 "(if symbols-accum_373"
@@ -22084,20 +22084,19 @@ static const char *startup_source =
 " sym-to-reqds_383"
 " sym_396"
 " null)))))"
-" already-defined?_397))))))))))"
+"(let-values(((or-part_417)"
+" any-already-defined?_394))"
+"(if or-part_417"
+" or-part_417"
+" already-defined?_397)))))))))))"
 "(values"
-" result_395)))))))"
-"(if(if(not"
-"((lambda x_0 result_392)"
-" out-sym_390"
-" binding/p_391))"
-"(not #f)"
-" #f)"
+" any-already-defined?_395)))))))"
+"(if(not #f)"
 "(for-loop_387"
-" result_392"
+" any-already-defined?_392"
 "(hash-iterate-next ht_386 i_0))"
-" result_392)))"
-" result_0)))))"
+" any-already-defined?_392)))"
+" any-already-defined?_0)))))"
 " for-loop_387)"
 " #f"
 "(hash-iterate-first ht_386))))))))))))))))))))))))))))))"