book-monads/src/ch04/s00-concerns.md
2023-05-20 14:38:49 +00:00

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# Concerns (questions) with the current implementaion
## There exist alternative `Functor` implementations
See the [relevant subchapter](./s01-alternatives.md)
## It might be better to have a per-lifetime trait for `Functor`s
See the [relevant subchapter](./s02-lifetimes.md)
## `Stackless` is kind of bad
See the [relevant subchapter](./s03-stackless.md)
## `WeakFunctor::F<'a, A>` is not (yet) covariant over the lifetime `'a`
See the [relevant subchapter](./s04-covariance.md)
## `Fail`/`FailMonad`/etc. have unclear semantics
See the [relevant subchapter](./s05-fail.md)
## Can `WeakFunctor` be an associated type of a `Functor` instead of its supertype?