bors
b8c8287a22
Yeet the `effects` feature, move it onto `const_trait_impl` This PR merges the `effects` feature into the `const_trait_impl` feature. There's really no need to have two feature gates for one feature. After this PR, if `const_trait_impl` **is** enabled: * Users can use and define const traits * `HostEffect` const conditions will be enforced on the HIR * We re-check the predicates in MIR just to make sure that we don't "leak" anything during MIR lowering And if `const_trait_impl` **is not** enabled: * Users cannot use nor define const traits * `HostEffect` const conditions are not enforced on the HIR * We will raise a const validation error if we call a function that has any const conditions (i.e. const traits and functions with any `~const` in their where clasues) This should be the last step for us to be able to enable const traits in the standard library. We still need to re-constify `Drop` and `Destruct` and stuff for const traits to be particularly *useful* for some cases, but this is a good step :D r? fee1-dead cc `@rust-lang/project-const-traits`
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