This is feedback from someone just getting started with MLF. I find it useful to get feedback for my projects from users that first use it as they don't have an in-depth understanding yet, which sometimes uncovers things I just got accustomed to. Hence this comment.
I was surprised that defs need a semi-colon but records are not allowed to have one. I prefer having less semi-colons, so I would drop them from the defs. Though there can well be a reason to have them, which I didn't understand yet. So feel free to close this as a won't fix.
There are also two examples where they are missing:
https://tangled.org/stavola.xyz/mlf/blob/52d38883/website/content/docs/language-guide/08-imports.md?code=true#L138 https://tangled.org/stavola.xyz/mlf/blob/52d38883/website/content/docs/language-guide/08-imports.md?code=true#L175
There are also other keywords that need a semi-colon, I just picked def as an example.