From 06bffe836c98a65d270579f08004503ffce9931c Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 28 Nov 2021 20:24:17 +0000
Subject: patch 8.2.3690: Vim9: "filter #pat# cmd" does not work

Problem:    Vim9: "filter #pat# cmd" does not work.
Solution:   Do not see #pat# as a comment.
---
 src/ex_docmd.c                |  9 ++++++++-
 src/testdir/test_vim9_cmd.vim | 10 ++++++++++
 src/version.c                 |  2 ++
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index d74ef9026..6d2923ccb 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -2910,7 +2910,14 @@ parse_command_modifiers(
 			    int	    c = 0;
 
 			    if (!checkforcmd_noparen(&p, "filter", 4)
-						|| *p == NUL || ends_excmd(*p))
+				    || *p == NUL
+				    || (ends_excmd(*p)
+#ifdef FEAT_EVAL
+					// in ":filter #pat# cmd" # does not
+					// start a comment
+				     && (!in_vim9script() || VIM_ISWHITE(p[1]))
+#endif
+				     ))
 				break;
 			    if (*p == '!')
 			    {
diff --git a/src/testdir/test_vim9_cmd.vim b/src/testdir/test_vim9_cmd.vim
index 7a05189db..57796b69b 100644
--- a/src/testdir/test_vim9_cmd.vim
+++ b/src/testdir/test_vim9_cmd.vim
@@ -714,6 +714,16 @@ def Test_command_modifier_filter()
       assert_match('very specific z3d37dh234 string', Screenline(&lines))
   END
   CheckDefAndScriptSuccess(lines)
+
+  lines =<< trim END
+      edit foobar
+      redir => g:filter_out
+      filter #foobar# ls
+      redir END
+      assert_match('"foobar"', g:filter_out)
+      unlet g:filter_out
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_win_command_modifiers()
diff --git a/src/version.c b/src/version.c
index deefcf0c2..d7c2d6980 100644
--- a/src/version.c
+++ b/src/version.c
@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3690,
 /**/
     3689,
 /**/
-- 
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