diff --git a/elisp/ghc-check.el b/elisp/ghc-check.el
index 5819a17..d02142a 100644
--- a/elisp/ghc-check.el
+++ b/elisp/ghc-check.el
@@ -295,14 +295,13 @@ nil            do not display errors/warnings.
   (let ((file-msgs (ghc-get-only-holes)))
     (if (null file-msgs)
 	(message "No holes")
-      (let ((file (ghc-file-msgs-get-file file-msgs))
-	    (msgs (ghc-file-msgs-get-msgs file-msgs)))
+      (let ((msgs (ghc-file-msgs-get-msgs file-msgs)))
 	(ghc-display
 	 nil
 	 (lambda ()
            (progn
 	     (mapc (lambda (x) (insert x "\n\n")) msgs)
-             (buttonize-buffer)) ))))))
+             (buttonize-buffer))))))))
 
 (defun ghc-display-holes-to-minibuf ()
   (let ((file-msgs (ghc-get-only-holes)))
@@ -479,7 +478,7 @@ nil            do not display errors/warnings.
 	(forward-line)
 	(re-search-forward "^$" nil t)
 	(insert fn)
-	(dotimes (i arity)
+	(dotimes (_i arity)
 	  (insert " _"))
 	(insert  " = error \"" fn "\"\n")))))
 
diff --git a/elisp/ghc-doc.el b/elisp/ghc-doc.el
index 512fa7d..42790dd 100644
--- a/elisp/ghc-doc.el
+++ b/elisp/ghc-doc.el
@@ -54,7 +54,7 @@
 (defconst ghc-doc-hackage-format
   "http://hackage.haskell.org/packages/archive/%s/%s/doc/html/%s.html")
 
-(defun ghc-browse-url-safari (uri &rest args)
+(defun ghc-browse-url-safari (uri &rest _args)
 "Open a URI in Safari using AppleScript. This preserves anchors."
   (let ((script (format "
 tell application \"Safari\"
diff --git a/elisp/ghc-func.el b/elisp/ghc-func.el
index 83d1840..34eff59 100644
--- a/elisp/ghc-func.el
+++ b/elisp/ghc-func.el
@@ -18,9 +18,10 @@
 (defun ghc-replace-character (string from to)
   "Replace characters equal to FROM to TO in STRING."
   (let ((ret (copy-sequence string)))
-    (dotimes (cnt (length ret) ret)
+    (dotimes (cnt (length ret))
       (if (char-equal (aref ret cnt) from)
-	  (aset ret cnt to)))))
+	  (aset ret cnt to)))
+    ret))
 
 (defun ghc-replace-character-buffer (from-c to-c)
   (let ((from (char-to-string from-c))
@@ -66,7 +67,7 @@
     (dolist (lst lol)
       (dolist (key lst)
 	(puthash key key hash)))
-    (maphash (lambda (key val) (ghc-add ret key)) hash)
+    (maphash (lambda (key _val) (ghc-add ret key)) hash)
     ret))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -90,8 +91,9 @@
     (condition-case nil
 	(let ((m (set-marker (make-marker) 1 (current-buffer)))
 	      ret)
-	  (dotimes (i n (nreverse ret))
-	    (ghc-add ret (read m))))
+	  (dotimes (_i n)
+	    (ghc-add ret (read m)))
+	  (nreverse ret))
       (error ()))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -108,10 +110,11 @@
 
 (defun ghc-keyword-number-pair (spec)
   (let ((len (length spec)) key ret)
-    (dotimes (i len (nreverse ret))
+    (dotimes (i len)
       (setq key (intern (concat ":" (symbol-name (car spec)))))
       (setq ret (cons (cons key i) ret))
-      (setq spec (cdr spec)))))
+      (setq spec (cdr spec)))
+    (nreverse ret)))
 
 (defmacro ghc-defstruct (type &rest spec)
   `(progn
diff --git a/elisp/ghc-indent.el b/elisp/ghc-indent.el
index 3f1de9e..519cce5 100644
--- a/elisp/ghc-indent.el
+++ b/elisp/ghc-indent.el
@@ -10,11 +10,11 @@
 
 (defvar ghc-indent-offset 4)
 
-(defun ghc-make-indent-shallower (beg end)
+(defun ghc-make-indent-shallower (_beg _end)
   (interactive "r")
   (indent-rigidly (region-beginning) (region-end) (- ghc-indent-offset)))
 
-(defun ghc-make-indent-deeper (beg end)
+(defun ghc-make-indent-deeper (_beg _end)
   (interactive "r")
   (indent-rigidly (region-beginning) (region-end) ghc-indent-offset))
 
diff --git a/elisp/ghc-info.el b/elisp/ghc-info.el
index d7854c5..abe4356 100644
--- a/elisp/ghc-info.el
+++ b/elisp/ghc-info.el
@@ -63,7 +63,7 @@
 	(cons 'ghc-type-clear-overlay after-change-functions))
   (add-hook 'post-command-hook 'ghc-type-post-command-hook))
 
-(defun ghc-type-clear-overlay (&optional beg end len)
+(defun ghc-type-clear-overlay (&optional _beg _end _len)
   (when (overlayp ghc-type-overlay)
     (ghc-type-set-ix 0)
     (ghc-type-set-point 0)
diff --git a/elisp/ghc-process.el b/elisp/ghc-process.el
index 94dc5d7..3e0c4a5 100644
--- a/elisp/ghc-process.el
+++ b/elisp/ghc-process.el
@@ -141,7 +141,7 @@
 	  (funcall ghc-process-callback 'ng)
 	  (setq ghc-process-running nil)))))))
 
-(defun ghc-process-sentinel (process event)
+(defun ghc-process-sentinel (_process _event)
   (setq ghc-process-running nil))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
diff --git a/elisp/ghc-rewrite.el b/elisp/ghc-rewrite.el
index e8087a9..20f7f69 100644
--- a/elisp/ghc-rewrite.el
+++ b/elisp/ghc-rewrite.el
@@ -126,12 +126,9 @@
       (lambda ()
         (insert "Possible completions:\n")
         (mapc
-          (lambda (x)
-            (let* (; (ins1      (insert "- "))
-                   (pos-begin (point))
-                   (ins       (insert x))
-                   (pos-end   (point))
-                   (ins3      (insert "\n")))
+          (lambda (_x)
+            (let ((pos-begin (point))
+                  (pos-end   (point)))
               (make-button pos-begin pos-end :type 'auto-button)))
           (ghc-sinfo-get-info info))))
     (select-window (ghc-auto-completion-window))))