expander: repair handling of non-interned provides

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

@@ -173,7 +173,8 @@
   (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/or ([(out-sym binding/p) (in-hash provides)]
+           #:unless (not (symbol-interned? out-sym)))
     (when symbols-accum (hash-set! symbols-accum out-sym #t))
     (cond
       [(hash-ref bulk-excepts out-sym #f)
@@ -504,16 +505,12 @@
               (for/list ([mpi (in-list mpis)])
                 (module-path-index-shift mpi from-mpi to-mpi))))]))
 
-;; Also removes uninterned (uncluding unreadable) symbols from among
+;; Note: the provides may include non-interned symbols. Those may be
-;; provides, just in case something like a lifted identifier was
+;; accessible via` dynamic-require`, but don't import them.
-;; provided. Since lifting generates a locally deterministic
-;; unreadable symbol that is intended to be specific to a particular
-;; module, exporting unreadable symbols can create collisions.
 (define (shift-provides-module-path-index provides from-mpi to-mpi)
   (for/hasheqv ([(phase at-phase) (in-hash provides)])
     (values phase
-            (for/hasheq ([(sym binding) (in-hash at-phase)]
+            (for/hasheq ([(sym binding) (in-hash at-phase)])
-                         #:when (symbol-interned? sym))
               (values sym
                       (cond
                        [(eq? from-mpi to-mpi) binding]

racket/src/expander/expand/require.rkt

@@ -295,6 +295,9 @@
                 (define provide-phase (module-binding-nominal-phase binding))
                 (define adjusted-sym
                   (cond
+                    [(not (symbol-interned? sym))
+                     ;; Don't `require` non-interned symbols
+                     #f]
                     [(and skip-variable-phase-level
                           (not as-transformer?)
                           (equal? provide-phase skip-variable-phase-level))

racket/src/expander/namespace/module.rkt

@@ -61,7 +61,7 @@
 (struct module (source-name     ; #f, symbol, or complete path
                 self            ; module path index used for a self reference
                 requires        ; list of (cons phase list-of-module-path-index)
-                provides        ; phase-level -> sym -> binding or (provided binding bool bool)
+                provides        ; phase-level -> sym -> binding or (provided binding bool bool); see [*] below
                 [access #:mutable] ; phase-level -> sym -> 'provided or 'protected; computed on demand from `provides`
                 language-info   ; #f or vector
                 min-phase-level ; phase-level
@@ -79,6 +79,14 @@
                 supermodule-name ; associated supermodule (i.e, when declared together)
                 get-all-variables)) ; for `module->indirect-exports`
 
+;; [*] Beware that tabels in `provides` may map non-interned symbols
+;;     to provided bindings, in case something like a lifted
+;;     identifier was provided. Since lifting generates a locally
+;;     deterministic unreadable symbol that is intended to be specific
+;;     to a particular module, `require`ing unreadable symbols can
+;;     create collisions. Still, the provided binding is supposed to
+;;     be accessible via `dynamic-require`.
+
 (struct module-linklet-info (linklet-or-instance ; #f, linklet, or instance supplied for cross-linking optimization
                              module-uses         ; #f or vector for linklet's imports
                              self                ; self modidx

racket/src/expander/syntax/binding-table.rkt

@@ -222,7 +222,8 @@
             [(binding-id) (cond
                            [(pair? i)
                             (define bulk (bulk-binding-at-bulk (car i)))
-                            (define b-info (hash-ref (bulk-binding-symbols bulk s extra-shifts) sym #f))
+                            (define b-info (and (symbol-interned? sym) ; don't `require` non-interned
+                                                (hash-ref (bulk-binding-symbols bulk s extra-shifts) sym #f)))
                             (and b-info
                                  ((bulk-binding-create bulk) bulk b-info sym))]
                            [else (hash-iterate-value ht i)])])

racket/src/expander/syntax/bulk-binding.rkt

@@ -142,7 +142,9 @@
 
 (define (bulk-provides-add-prefix-remove-exceptions provides prefix excepts)
   (for/hash ([(sym val) (in-hash provides)]
-             #:unless (hash-ref excepts sym #f))
+             #:unless (hash-ref excepts sym #f)
+             ;; Don't `require` non-interned
+             #:when (symbol-interned? sym))
     (values (if prefix
                 (string->symbol (format "~a~a" prefix sym))
                 sym)