Decrease code duplication in byte-compiler free-vars warning

* lisp/emacs-lisp/bytecomp.el
(byte-compile-free-vars-warn): New defun extracted from...
(byte-compile-variable-ref, byte-compile-variable-set): ...here.

1 files changed, 23 insertions, 18 deletions

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 9ece8ec6f02..a20f3634560 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -3432,6 +3432,27 @@ for symbols generated by the byte compiler itself."
   (push var byte-compile-bound-variables)
   (byte-compile-dynamic-variable-op 'byte-varbind var))
 
+(defun byte-compile-free-vars-warn (var &optional assignment)
+  "Warn if symbol VAR refers to a free variable.
+VAR must not be lexically bound.
+If optional argument ASSIGNMENT is non-nil, this is treated as an
+assignment (i.e. `setq'). "
+  (unless (or (not (byte-compile-warning-enabled-p 'free-vars var))
+              (boundp var)
+              (memq var byte-compile-bound-variables)
+              (memq var (if assignment
+                            byte-compile-free-assignments
+                          byte-compile-free-references)))
+    (let* ((varname (prin1-to-string var))
+           (desc (if assignment "assignment" "reference"))
+           (suggestions (help-uni-confusable-suggestions varname)))
+      (byte-compile-warn "%s to free variable `%s'%s"
+                         desc varname
+                         (if suggestions (concat "\n  " suggestions) "")))
+    (push var (if assignment
+                  byte-compile-free-assignments
+                byte-compile-free-references))))
+
 (defun byte-compile-variable-ref (var)
   "Generate code to push the value of the variable VAR on the stack."
   (byte-compile-check-variable var 'reference)
@@ -3440,15 +3461,7 @@ for symbols generated by the byte compiler itself."
 	;; VAR is lexically bound
         (byte-compile-stack-ref (cdr lex-binding))
       ;; VAR is dynamically bound
-      (unless (or (not (byte-compile-warning-enabled-p 'free-vars var))
-		  (boundp var)
-		  (memq var byte-compile-bound-variables)
-		  (memq var byte-compile-free-references))
-        (let* ((varname (prin1-to-string var))
-               (suggestions (help-uni-confusable-suggestions varname)))
-          (byte-compile-warn "reference to free variable `%s'%s" varname
-                             (if suggestions (concat "\n  " suggestions) "")))
-	(push var byte-compile-free-references))
+      (byte-compile-free-vars-warn var)
       (byte-compile-dynamic-variable-op 'byte-varref var))))
 
 (defun byte-compile-variable-set (var)
@@ -3459,15 +3472,7 @@ for symbols generated by the byte compiler itself."
 	;; VAR is lexically bound.
         (byte-compile-stack-set (cdr lex-binding))
       ;; VAR is dynamically bound.
-      (unless (or (not (byte-compile-warning-enabled-p 'free-vars var))
-		  (boundp var)
-		  (memq var byte-compile-bound-variables)
-		  (memq var byte-compile-free-assignments))
-        (let* ((varname (prin1-to-string var))
-               (suggestions (help-uni-confusable-suggestions varname)))
-          (byte-compile-warn "assignment to free variable `%s'%s" varname
-                             (if suggestions (concat "\n  " suggestions) "")))
-	(push var byte-compile-free-assignments))
+      (byte-compile-free-vars-warn var t)
       (byte-compile-dynamic-variable-op 'byte-varset var))))
 
 (defmacro byte-compile-get-constant (const)