`impl Trait` for statics and consts

language design
1

This seems like something relatively simple compared to type_alias_impl_trait and does not require a typedef. e.g.

const DIGIT: impl Fn(&ParserState) -> Result<u8> = <my parser combinator here>;
2

Note that this already works and is optimized as expected:

const DIGIT: &dyn Fn(&ParserState) -> Result<u8> = &<my parser combinator here>;
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3

This looks longer than just writing a function though. The point of type_alias_impl_trait is that you can give a name to the closure and store it in a type without using generics.

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4

This tracking issue already exists (but the current implementation is for let only).

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