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// We currently do not properly support defining opaque // types in nested bodies. This means that recursively // calling calling a defining function inside of a closure // can easy result in incorrect compilation failures. fn expects_unit(_value: ()) {} // This function constrains the `impl Sized + 'a` inside // of the closure, causing it to error with both the old // and new trait solver. fn defines_in_closure<'a>() -> impl Sized + 'a { let _ = || expects_unit(defines_in_closure::<'a>()); } // This function also uses its RPIT inside of a closure. // However, it does not try to define it with the old // solver as its handling of opaque types is less eager. // // The next-generation trait solver does try to define // the opaque in this function as well, causing this to // be a breaking change for now, even though the underlying // issue is shared by both implementations. fn uses_in_closure<'a>() -> impl Sized + 'a { let _ = || uses_in_closure::<'a>(); }
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