bug#63251: 28.2; vhdl-mode contribution

[Mattias Engdegård]

9 maj 2023 kl. 18.16 skrev Cyril Arnould <cyril.arnould@outlook.com>:

> By defining the error message type to be nil rather than 2, we
> can forego the backwards compatibility code.
> <fix-vhdl-compiler-customization-4.patch>

Looks fine (although I had hoped to establish a precedent for less mutation in 
the updating code...).

Actually there is another argument to include updating code: subsequent changes 
will likely rely on existing values to conform strictly to the previous type 
and will likely botch any updating of values that don't.

For example, if yet another value is added to the entry, then it cannot just be 
appended to each entry because that entry might be too short because of the 
incomplete previous update.