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Implement ~const Fn trait goals in the new solver

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This commit is contained in:
Michael Goulet
2024-10-29 17:51:38 +00:00
parent 89b6885529
commit def7ed08e7
11 changed files with 193 additions and 109 deletions
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10
compiler/rustc_next_trait_solver/src/solve/trait_goals.rs
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@@ -326,6 +326,9 @@ where
return ecx.forced_ambiguity(MaybeCause::Ambiguity);
}
};
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output.map_bound(|(_, output)| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [output])
});
@@ -335,8 +338,6 @@ where
ty::TraitRef::new(cx, goal.predicate.def_id(), [goal.predicate.self_ty(), inputs])
})
.upcast(cx);
// A built-in `Fn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),
@@ -364,6 +365,9 @@ where
// This region doesn't matter because we're throwing away the coroutine type
Region::new_static(cx),
)?;
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
let output_is_sized_pred = tupled_inputs_and_output_and_coroutine.map_bound(
|AsyncCallableRelevantTypes { output_coroutine_ty, .. }| {
ty::TraitRef::new(cx, cx.require_lang_item(TraitSolverLangItem::Sized), [
@@ -380,8 +384,6 @@ where
])
})
.upcast(cx);
// A built-in `AsyncFn` impl only holds if the output is sized.
// (FIXME: technically we only need to check this if the type is a fn ptr...)
Self::probe_and_consider_implied_clause(
ecx,
CandidateSource::BuiltinImpl(BuiltinImplSource::Misc),