bug#46024: Perl mode colors the word "argument" funny [PATCH]

[haj@posteo.de (Harald Jörg)]

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Lars Ingebrigtsen <larsi@gnus.org> writes:

> [...]
> Long term, it does seem like the best solution would be to have a
> separate mode for Raku, and not keep tweaking (c)perl-mode to add Raku
> features, I think.
>
> So backing out this change ('argument' etc) sounds like a good idea to
> me.

The attached patch removes the declarators and prefixes which are not in
Perl.

BTW: There is a Raku mode, maintained by the Raku team in their
repository on GitHub.
-- 
Cheers,
haj

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From 7fee0d96a94dfca5567efc757f5b38655e807787 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Harald=20J=C3=B6rg?= <haj@posteo.de>
Date: Wed, 27 Jan 2021 14:50:01 +0100
Subject: [PATCH] ; perl-mode.el: Eliminate keywords which are not in Perl.

* lisp/progmodes/perl-mode.el (perl-imenu-generic-expression):
Remove keywords which are not part of Perl.
(perl-font-lock-keywords-2): Remove keywords which are not part of
Perl.
---
 lisp/progmodes/perl-mode.el | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/lisp/progmodes/perl-mode.el b/lisp/progmodes/perl-mode.el
index d047dd543c..0120e4a7cd 100644
--- a/lisp/progmodes/perl-mode.el
+++ b/lisp/progmodes/perl-mode.el
@@ -143,7 +143,7 @@ perl-imenu-generic-expression
   '(;; Functions
     (nil "^[ \t]*sub\\s-+\\([-[:alnum:]+_:]+\\)" 1)
     ;;Variables
-    ("Variables" "^[ \t]*\\(?:anon\\|argument\\|has\\|local\\|my\\|our\\|state\\|supersede\\)\\s-+\\([$@%][-[:alnum:]+_:]+\\)\\s-*=" 1)
+    ("Variables" "^[ \t]*\\(?:has\\|local\\|my\\|our\\|state\\)\\s-+\\([$@%][-[:alnum:]+_:]+\\)\\s-*=" 1)
     ("Packages" "^[ \t]*package\\s-+\\([-[:alnum:]+_:]+\\);" 1)
     ("Doc sections" "^=head[0-9][ \t]+\\(.*\\)" 1))
   "Imenu generic expression for Perl mode.  See `imenu-generic-expression'.")
@@ -188,9 +188,8 @@ perl-font-lock-keywords-2
               "\\>")
      ;;
      ;; Fontify declarators and prefixes as types.
-     ("\\<\\(anon\\|argument\\|has\\|local\\|my\\|our\\|state\\|supersede\\)\\>" . font-lock-type-face) ; declarators
-     ("\\<\\(let\\|temp\\)\\>" . font-lock-type-face) ; prefixes
-     ;;
+     ("\\<\\(has\\|local\\|my\\|our\\|state\\)\\>" . font-lock-type-face) ; declarators
+          ;;
      ;; Fontify function, variable and file name references.
      ("&\\(\\sw+\\(::\\sw+\\)*\\)" 1 font-lock-function-name-face)
      ;; Additionally fontify non-scalar variables.  `perl-non-scalar-variable'
-- 
2.20.1