multibyte character in rhs of mapping absent from output of ":map"

[lacygoill]

Describe the bug

The output of :map x may be wrong when the rhs of the x mapping contains a multibyte character.

To Reproduce

Run this shell command:

vim -Nu NONE +'map x –'

Then, run this Ex command:

:map x

The output is:

x

Expected behavior

The output is:

x             –

Environment

• Vim version: 8.2 Included patches: 1-740
• OS: Ubuntu 16.04.6 LTS
• Terminal: XTerm(322)

Additional context

With execute() (or :redir), the output is different (but still wrong):

vim -Nu NONE +'map x –'
:echo execute('map x')
x             ^S
              ^^

This time, Vim prints the caret notation of the C-s character.

---

I can reproduce the issue with an abbreviation too:

vim -Nu NONE +'iab x –'
:iab x
i  x

vim -Nu NONE +'iab x –'
:echo execute('iab x')
i  x             ^S

[tonymec]

Here are a few possibilities:

• Does it work in gvim?
• Are you able to display the same Unicode character in the same xterm when Vim is not running?
• What is 'encoding' set to? In particular, is it set to utf-8 ? And if it is, does your vimrc set that value before defining the mapping?
• If you define that mapping in your vimrc, does that vimrc include near the top the line

scriptencoding utf-8

?

• In the shell from which you start Vim, what are $LC_ALL, $LC_CTYPE and $LANG set to (and which of them are unset)?

[lacygoill]

Does it work in gvim?

No, it doesn't work as expected:

gvim -Nu NONE +'map x –'
:map x
x    ?
:echo execute('map x')
x    ^S

Are you able to display the same Unicode character in the same xterm when Vim is not running?

Yes:

$ printf -- '–'
–

What is 'encoding' set to? In particular, is it set to utf-8 ? And if it is, does your vimrc set that value before defining the mapping?

'encoding' is set with its default value which is utf-8.
I don't know when Vim sets the option, but I don't set it manually when I start Vim with -Nu NONE.
I can reproduce even if I run map x – later:

vim -Nu NONE
:map x –
:map x
x
:echo execute('map x')
x             ^S

If you define that mapping in your vimrc, does that vimrc include near the top the line

scriptencoding utf-8

No, but I have this line in my vimrc before installing mappings:

set encoding=utf-8

But I can reproduce even without any config.

In the shell from which you start Vim, what are $LC_ALL, $LC_CTYPE and $LANG set to (and which of them are unset)?

LC_ALL and LANG are both set to en_US.UTF-8. LC_CTYPE is unset.