4cd91ef822
`-Znext-solver` allow `ExprKind::Call` for not-yet defined opaques Based on https://github.com/rust-lang/rust/pull/146329. Revival of rust-lang/rust#140496. See the comment on `OpaqueTypesJank`. I've used the following document while working on this https://hackmd.io/Js61f8PRTcyaiyqS-fH9iQ. Fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/181. It does introduce one subtle footgun we may want to handle before stabilization, opened https://github.com/rust-lang/trait-system-refactor-initiative/issues/230 for that. Also cc https://github.com/rust-lang/trait-system-refactor-initiative/issues/231 for deref and index operations r? `@BoxyUwU`
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