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RFC: Multi-Type Return Position Impl Trait (MTRPIT) #3367

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RFC: Multi-Type Return Position Impl Trait (MTRPIT) #3367

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7eafd50
Create RFC for "return position enum impl trait"
yoshuawuyts Jan 5, 2023
cfdbaca
fix typos
yoshuawuyts Jan 7, 2023
7caaf19
default trait methods section
yoshuawuyts Jan 7, 2023
6d5381e
add dispatch-safety todo
yoshuawuyts Jan 9, 2023
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add dispatch-safety todo
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@yoshuawuyts
yoshuawuyts committed Jan 9, 2023
commit 6d5381e28095dfe37451a803bed2640860ee5fef
9 changes: 8 additions & 1 deletion text/0000-multi-type-return-position-impl-trait.md
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Expand Up @@ -34,6 +34,7 @@
- [Anonymous enums](#anonymous-enums)
- [Language-level support for delegation/proxies](#language-level-support-for-delegationproxies)
- [(TODO) Mark unimplementable/sealed trait methods](#todo-mark-unimplementablesealed-trait-methods)
- [(TODO) Annotate dispatch-safety](#todo-annotate-dispatch-safety)
- [(TODO) Clippy lint tracking big impl traits](#todo-clippy-lint-tracking-big-impl-traits)


Expand Down Expand Up @@ -320,7 +321,7 @@ is: just say it's an `impl Trait`.)
## (TODO) `Any` trait and `TypeId`

TODO (tldr: proxy the type id to the inner type, that's what `dyn` does too. You
can't downcast `impl Trait` as-is anyway, so it's likely fine.
can't downcast `impl Trait` as-is anyway, so it's likely fine).

# Interaction with lifetimes

Expand Down Expand Up @@ -658,6 +659,12 @@ but that information is not available from the interface anywhere. Can we
surface or somehow mark which methods can _actually_ be overloaded, versus which
can't?)

## (TODO) Annotate dispatch-safety

TODO (tldr receiverless functions (static methods) and traits with associated
consts can't be delegated to. We should have some opt-in or opt-out marker for a
trait which can be dispatched to.)

## (TODO) Clippy lint tracking big impl traits

TODO (tldr clippy tracks big enums and big errors already, it probably should
Expand Down