M-t for hlint. An error/warning place is replaced with suggestion

but not perfect.

elisp/ghc-command.el

@@ -15,12 +15,12 @@
   (cond
    ((bobp)
     (ghc-insert-module-template))
+   ((ghc-flymake-have-errs-p)
+    (ghc-flymake-insert-from-warning))
    ((save-excursion
       (beginning-of-line)
       (looking-at "^[^ ]+ *::"))
     (ghc-insert-function-template))
-   ((ghc-flymake-have-errs-p)
-    (ghc-flymake-insert-from-warning))
    (t
     (message "Nothing to be done"))))
 

elisp/ghc-flymake.el

@@ -89,7 +89,16 @@
 	  (unless (re-search-forward "^$" nil t)
 	    (goto-char (point-max))
 	    (insert "\n")))
-	(insert "\n" (match-string 1 data) " = undefined\n"))))))
+	(insert "\n" (match-string 1 data) " = undefined\n"))
+       ((string-match "Found:\0[ ]*\\([^\0]+\\)\0Why not:\0[ ]*\\([^\0]+\\)" data)
+	(let ((old (match-string 1 data))
+	      (new (match-string 2 data)))
+	  (beginning-of-line)
+	  (when (search-forward old nil t)
+	    (let ((end (point)))
+	      (search-backward old nil t)
+	      (delete-region (point) end))
+	    (insert new))))))))
 
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