Remove/rename unused lexical arguments

Fixes:
    purescript-indent.el:437:19: Error: Unused lexical variable ‘errlist’
    purescript-indent.el:1295:34: Error: Unused lexical argument ‘start’
    purescript-mode.el:416:44: Error: Unused lexical argument ‘info’

Author: Hi-Angel

purescript-indent.el

@@ -434,7 +434,7 @@ Returns the location of the start of the comment, nil otherwise."
 (defun purescript-indent-next-symbol-safe (end)
   "Puts point to the next following symbol, or to end if there are no more
 symbols in the sexp."
-  (condition-case errlist (purescript-indent-next-symbol end)
+  (condition-case nil (purescript-indent-next-symbol end)
     (error (goto-char end))))
 
 (defun purescript-indent-separate-valdef (start end)
@@ -1292,7 +1292,7 @@ We stay in the cycle as long as the TAB key is pressed."
         (if marker
             (goto-char (marker-position marker)))))))
 
-(defun purescript-indent-region (start end)
+(defun purescript-indent-region (_start _end)
   (error "Auto-reindentation of a region is not supported"))
 
 ;;; alignment functions
@@ -1430,9 +1430,9 @@ TYPE is either \\='guard or \\='rpurs."
             (if regstack
                 (purescript-indent-shift-columns maxcol regstack)))))))
 
-(defun purescript-indent-align-guards-and-rpurs (start end)
+(defun purescript-indent-align-guards-and-rpurs (_start _end)
   "Align the guards and rpurs of functions in the region, which must be active."
-  ;; The `start' and `end' args are dummys right now: they're just there so
+  ;; The `_start' and `_end' args are dummys right now: they're just there so
   ;; we can use the "r" interactive spec which properly signals an error.
   (interactive "*r")
   (purescript-indent-align-def t 'guard)

purescript-mode.el

@@ -413,7 +413,7 @@ see documentation for that variable for more details."
 
 ;;;###autoload(add-to-list 'auto-mode-alist '("\\.purs\\'" . purescript-mode))
 
-(defun purescript-pursuit (query &optional info)
+(defun purescript-pursuit (query &optional _info)
   "Do a Pursuit search for QUERY.
 When `purescript-pursuit-command' is non-nil, this command runs
 that.  Otherwise, it opens a Pursuit search result in the browser.