From 82b3b4c6cf2973fe767f8e2311482af0bd95267e Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Wed, 22 Dec 2021 19:19:08 +0000
Subject: patch 8.2.3873: go.mod files are not recognized

Problem:    go.mod files are not recognized.
Solution:   Check for the file name. (closes #9380)
---
 runtime/filetype.vim          | 4 +++-
 src/testdir/test_filetype.vim | 1 +
 src/version.c                 | 2 ++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/runtime/filetype.vim b/runtime/filetype.vim
index 7740d8faa..bd1d2e905 100644
--- a/runtime/filetype.vim
+++ b/runtime/filetype.vim
@@ -1091,7 +1091,9 @@ au BufNewFile,BufRead *.mmp			setf mmp
 
 " Modsim III (or LambdaProlog)
 au BufNewFile,BufRead *.mod
-	\ if getline(1) =~ '\<module\>' |
+	\ if expand("<afile>") =~ '\<go.mod$' |
+	\   setf gomod |
+	\ elseif getline(1) =~ '\<module\>' |
 	\   setf lprolog |
 	\ else |
 	\   setf modsim3 |
diff --git a/src/testdir/test_filetype.vim b/src/testdir/test_filetype.vim
index cd82e3814..719d690e8 100644
--- a/src/testdir/test_filetype.vim
+++ b/src/testdir/test_filetype.vim
@@ -204,6 +204,7 @@ let s:filename_checks = {
     \ 'gnash': ['gnashrc', '.gnashrc', 'gnashpluginrc', '.gnashpluginrc'],
     \ 'gnuplot': ['file.gpi'],
     \ 'go': ['file.go'],
+    \ 'gomod': ['go.mod'],
     \ 'gp': ['file.gp', '.gprc'],
     \ 'gpg': ['/.gnupg/options', '/.gnupg/gpg.conf', '/usr/any/gnupg/options.skel', 'any/.gnupg/gpg.conf', 'any/.gnupg/options', 'any/usr/any/gnupg/options.skel'],
     \ 'grads': ['file.gs'],
diff --git a/src/version.c b/src/version.c
index 7a1fd69ed..53d3b57e1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3873,
 /**/
     3872,
 /**/
-- 
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