[Bug c++/88501] Improve suggested alternative to be closer to typo

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88501

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonny Grant from comment #3)
> I wonder, for typos if a simple byte compare would be enough? Vary each char
> by 1 letter, or length. This starts to get complicated I know..

The matching code is already significantly smarter than that. The problem is
that "string" is not in the set of candidates being matched against, so a
simple byte compare isn't going to help find it any better than the current
code.

> "st!ing"

! is a single byte in UTF-8