rust-lang / rust-lang/rfcs

impl dyn Any for monomorphized dyn Trait

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Description

there's no reason why stuff like this shouldn't be made more friendly and optimized (I shouldn't need two boxes for it to work): https://play.rust-lang.org/?version=stable&mode=debug&edition=2015&gist=7281cea78856a6bc6c8693dcb320b9d0

note that I'm talking specifically about fn<T: Foo>(t: T) -> Box<dyn Any> kinda usage. you wouldn't be able to take an arbitrary dyn Foo and turn it into an dyn Any (yet).

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Research direction

Start with the linked Rust playground example and the stated generic dyn Trait to Box<dyn Any> usage; no repository file or test is identified. Done would require a decided and documented approach that addresses the requested behavior and the limitation around arbitrary dyn Foo conversions.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
25/100

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