bug#56110: 27+; switching from line-mode to char-mode

[Stefan Monnier]

>> This maybe?
>
> That works - but I fail to understand why a simple `let' doesn't suffice
> (which works as well):

Depends if you want to have to think about what other code does or not.
If you don't, then `let` is not the same: e.g. if some other code uses
`add/remove-function` on that variable within your `let`, their changes
will be lost when your `let` ends.


        Stefan