anonymous lifetimes in `impl Trait` are unstable

[ryo33]

I forgot to support lifetime parameters??

[Kaiden42]

I had a similar problem in the past. If I remember correcty, I've solved it by specifying the generic lifetime that is required by the struct.

This might solve your problem:

    fn suggest_migration<'a>(&mut self, vm: &'a VmInfo<'a>) -> Vec<MigrateSuggestion>;

(Or with a different lifetime that the lifetime of the borrowing if those two lifetimes don't match)