Circumvented raco cover issue with eval and fixed srcloc for reader-injected code, as suggested by Spencer Florence https://github.com/florence/cover/issues/128#issuecomment-240503899

lang/reader.rkt

@@ -10,21 +10,61 @@
          (only-in syntax/module-reader make-meta-reader)
          syntax/strip-context)
 
+;; Replaces the syntax/loc for the top of the syntax object, until
+;; a part which doesn't belong to old-source is reached.
+;; e.g. (with-syntax ([d user-provided-syntax])
+;;        (replace-top-loc
+;;          #'(a b (c d e))
+;;          (syntax-source #'here)
+;;          new-loc))
+;; will produce a syntax object #'(a b (c (x (y) z) e))
+;; where a, b, c, z, e and their surrounding forms have their srcloc set to
+;; new-loc, but (x (y) z) will be left intact, if the user-provided-syntax
+;; appears in another file.
+(define (replace-top-loc stx old-source new-loc)
+  (let process ([stx stx])
+    (cond
+      [(syntax? stx)
+       (if (equal? (syntax-source stx) old-source)
+           (datum->syntax stx (process (syntax-e stx)) new-loc stx)
+           stx
+           ;; Use the following expression to replace the loc throughout stx
+           ;; instead of stopping the depth-first-search when the syntax-source
+           ;; is not old-source anymore
+           #;(datum->syntax stx (process (syntax-e stx)) stx stx))]
+      [(pair? stx)
+       (cons (process (car stx))
+             (process (cdr stx)))]
+      [(vector? stx)
+       (list->vector (process (vector->list stx)))]
+      [(prefab-struct-key stx)
+       => (λ (key)
+            (make-prefab-struct key
+                                (process (struct->vector stx))))]
+      [else
+       stx])))
+
 (define ((wrap-reader reader) chr in src line col pos)
   (define/with-syntax orig-mod
     (reader chr (narrow-until-prompt in) src line col pos))
   
-  (with-syntax ([(mod nam lang (modbeg . body))
-                 (eval #'(expand #'orig-mod)
-                       (variable-reference->namespace (#%variable-reference)))])
-    #`(mod nam lang
-           (modbeg
-            (module code racket/base)
-            (module* test racket/base
-              (require repltest/private/run-interactions)
-              (run-interactions (open-input-string #,(port->string in))
-                                (#%variable-reference)))
-            . body))))
+  (define/with-syntax (mod nam lang (modbeg . body))
+    (parameterize ([current-namespace (variable-reference->namespace
+                                       (#%variable-reference))])
+      (expand #'orig-mod)))
+  ;; quasisyntax/loc Necessary so that the generated code has the correct srcloc
+  (replace-top-loc
+   #`(mod nam lang
+          (modbeg
+           ;(quote-syntax orig-mod)
+           (module* test racket/base
+             (require repltest/private/run-interactions)
+             ;; TODO: set-port-next-location! for (open-input-string …)
+             (run-interactions (open-input-string #,(port->string in))
+                               (#%variable-reference)))
+           . body))
+   (syntax-source #'here)
+   #'mod))
 
 (define-values (repltest-read repltest-read-syntax repltest-get-info)
   (make-meta-reader

main.rkt

@@ -1,25 +1,3 @@
 #lang racket/base
 
 ;; This package is a meta-language, and currently provides no bindings.
-
-;; Notice
-;; To install (from within the package directory):
-;;   $ raco pkg install
-;; To install (once uploaded to pkgs.racket-lang.org):
-;;   $ raco pkg install <<name>>
-;; To uninstall:
-;;   $ raco pkg remove <<name>>
-;; To view documentation:
-;;   $ raco doc <<name>>
-;;
-;; For your convenience, we have included a LICENSE.txt file, which links to
-;; the GNU Lesser General Public License.
-;; If you would prefer to use a different license, replace LICENSE.txt with the
-;; desired license.
-;;
-;; Some users like to add a `private/` directory, place auxiliary files there,
-;; and require them in `main.rkt`.
-;;
-;; See the current version of the racket style guide here:
-;; http://docs.racket-lang.org/style/index.html
-