roc issues

Don't suggest removing variable when it's bound in a branch pattern

Instead, suggest prefixing it with an underscore, or replacing with an underscore. Closes #3820

Turn on ability tests that work

Support bound and unbound extension variables in deriving

A key thing about unbound extension variables is that they provide no information. For example, given a type `[A Str]b`, one cannot do anything with `b` until it is resolved...

ayazhafiz

rust 1.63 clippy

- clippy fixes - more various clippy fixes

folkertdev

dev backend mul

- make integer multiplication work for quadwords and lower - implement float multiplication - attempt at unsigned multiplication

folkertdev

[fix] Roc for Elm programmers / "`let` syntax" section

1

Signed-off-by: Rod

randomer

Fix file links in gen_dev readme

1

Super minor thing, but I was reading up on the dev backend and noticed the the file links in `gen_dev/README.md` were all dead. It seems `compiler/` was moved at some...

raleng