'syntax hi [...] start=[...] stop=[...]' has no effect

Hello Vim users,

I'm trying to get some fancy 24-bit color going with the official
vim using escape codes such as "<Esc>[38;2;${r};${g};${b}m", which
work on some terminals.

Now, according to Vim's documentation, it's possible to highlight
syntax regions with arbitrary terminal escape sequences using the
'start' and 'stop' arguments of the 'highlight' command (relevant
help entries: highlight-start, E422, term-list, highlight-stop).

However, this simply has no effect whatsoever, even when trying to
get some basic bold text, with e.g.:

hi mailSubject start=<Esc>[1m stop=<Esc>0m

I've also tried "hi clear" beforehand but that doesn't help.

This feature seems oddly ignored and forgotten, since my numerous
attempts at searching for it through Google have turned up no
relevant results, and the code for it in the git repo hasn't been
updated since 2004, so I'm guessing the behaviour I'm getting could
just be a bug that got in because nobody ever uses this feature.

If nobody comes up with a solution or an explanation to my problem,
I guess I'll file a bug report...

--
mwnx
GPG: AEC9 554B 07BD F60D 75A3 AF6A 44E8 E4D4 0312 C726

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