my rust fork
https://www.rust-lang.org
922958cffe
support non-defining uses of opaques in borrowck Reimplements the first part of rust-lang/rust#139587, but limited to only the new solver. To do so I also entirely rewrite the way we handle opaque types in borrowck even on stable. This should not impact behavior however. We now support revealing uses during MIR borrowck with the new solver: ```rust fn foo<'a>(x: &'a u32) -> impl Sized + use<'a> { let local = 1; foo::<'_>(&local); x } ``` ### How do opaque types work right now Whenever we use an opaque type during type checking, we remember this use in the `opaque_type_storage` of the `InferCtxt`. Right now, we collect all *member constraints* at the end of MIR type check by looking at all uses from the `opaque_type_storage`. We then apply these constraints while computing the region values for each SCC. This does not add actual region constraints but directly updates the final region values. This means we need to manually handle any constraints from member constraints for diagnostics. We do this by separately tracking `applied_member_constraints` in the `RegionInferenceContext`. After we've finished computing the region values, it is now immutable and we check whether all member constraints hold. If not, we error. We now map the hidden types of our defining uses to the defining scope. This assumes that all member constraints apply. To handle non-member regions, we simply map any region in the hidden type we fail to map to a choice region to `'erased` |
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