patch 8.1.0573: cannot redefine user command without ! in same script
Problem: Cannot redefine user command without ! in same script
Solution: Allow redefining user command without ! in same script, like with
functions.
diff --git a/src/testdir/test_usercommands.vim b/src/testdir/test_usercommands.vim
index 2709988..06b0a67 100644
--- a/src/testdir/test_usercommands.vim
+++ b/src/testdir/test_usercommands.vim
@@ -90,6 +90,34 @@
delcommand Dothat
endfunc
+func Test_redefine_on_reload()
+ call writefile(['command ExistingCommand echo "yes"'], 'Xcommandexists')
+ call assert_equal(0, exists(':ExistingCommand'))
+ source Xcommandexists
+ call assert_equal(2, exists(':ExistingCommand'))
+ " Redefining a command when reloading a script is OK.
+ source Xcommandexists
+ call assert_equal(2, exists(':ExistingCommand'))
+
+ " But redefining in another script is not OK.
+ call writefile(['command ExistingCommand echo "yes"'], 'Xcommandexists2')
+ call assert_fails('source Xcommandexists2', 'E174:')
+ call delete('Xcommandexists2')
+
+ " And defining twice in one script is not OK.
+ delcommand ExistingCommand
+ call assert_equal(0, exists(':ExistingCommand'))
+ call writefile([
+ \ 'command ExistingCommand echo "yes"',
+ \ 'command ExistingCommand echo "no"',
+ \ ], 'Xcommandexists')
+ call assert_fails('source Xcommandexists', 'E174:')
+ call assert_equal(2, exists(':ExistingCommand'))
+
+ call delete('Xcommandexists')
+ delcommand ExistingCommand
+endfunc
+
func Test_CmdUndefined()
call assert_fails('Doit', 'E492:')
au CmdUndefined Doit :command Doit let g:didit = 'yes'