Ken Takata wrote:

> I tried `:let &t_PS="\e[200~"` to set 't_PS' without using the raw
> escape code, but it failed with E355.  I didn't know that there are
> two types of 't_*'
> options: output code options and key code options. I found the following
> comment in option.c:
>     /* terminal key codes are not in here */
> Therefore this seems to be an intended behavior. However I couldn't find the
> reason in the document. So, is there any reasons that `:let &` cannot be used
> for key code options?
> 
> I think that it should be documented that `:let &` cannot be used for key code
> options. Please check the attached patch.
> 
> P.S. I can use `:exec "set t_PS=\e[200~"` instead of `:let &`.

There is no reason not to have :let work for these termcap settings,
other than that it's done in a different way.  See the call to
add_termcode() from option.c.  But it needs a few checks for a valid
name and calling ttest() afterwards.

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