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rust/library
Matthias Krüger 455a20b7ba Rollup merge of #102186 - ink-feather-org:const_try_trait, r=fee1-dead
Add const_closure, Constify Try trait

Adds a struct for creating const `FnMut` closures (for now just copy pasted form my [const_closure](https://crates.io/crates/const_closure) crate).
I'm not sure if this way is how it should be done.
The `ConstFnClosure` and `ConstFnOnceClosure` structs can probably also be entirely removed.

This is then used to constify the try trait.

Not sure if i should add const_closure in its own pr and maybe make it public behind a perma-unstable feature gate.

cc ```@fee1-dead```  ```@rust-lang/wg-const-eval```
2022-09-24 14:29:54 +02:00
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