Rollup merge of #121654 - compiler-errors:async-fn-for-fn-def, r=oli-obk

Fix `async Fn` confirmation for `FnDef`/`FnPtr`/`Closure` types

Fixes three issues:
1. The code in `extract_tupled_inputs_and_output_from_async_callable` was accidentally getting the *future* type and the *output* type (returned by the future) messed up for fnptr/fndef/closure types. :/
2. We have a (class of) bug(s) in the old solver where we don't really support higher ranked built-in `Future` goals for generators. This is not possible to hit on stable code, but [can be hit with `unboxed_closures`](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=e935de7181e37e13515ad01720bcb899) (#121653).
    * I'm opting not to fix that in this PR. Instead, I just instantiate placeholders when confirming `async Fn` goals.
4. Fixed a bug when generating `FnPtr` shims for `async Fn` trait goals.

r? oli-obk

1 files changed, 5 insertions, 1 deletions

diff --git a/compiler/rustc_mir_transform/src/shim.rs b/compiler/rustc_mir_transform/src/shim.rs
index 75613a2c555..733e2f93b25 100644
--- a/compiler/rustc_mir_transform/src/shim.rs
+++ b/compiler/rustc_mir_transform/src/shim.rs
@@ -37,7 +37,11 @@ fn make_shim<'tcx>(tcx: TyCtxt<'tcx>, instance: ty::InstanceDef<'tcx>) -> Body<'
         }
         ty::InstanceDef::FnPtrShim(def_id, ty) => {
             let trait_ = tcx.trait_of_item(def_id).unwrap();
-            let adjustment = match tcx.fn_trait_kind_from_def_id(trait_) {
+            // Supports `Fn` or `async Fn` traits.
+            let adjustment = match tcx
+                .fn_trait_kind_from_def_id(trait_)
+                .or_else(|| tcx.async_fn_trait_kind_from_def_id(trait_))
+            {
                 Some(ty::ClosureKind::FnOnce) => Adjustment::Identity,
                 Some(ty::ClosureKind::Fn) => Adjustment::Deref { source: DerefSource::ImmRef },
                 Some(ty::ClosureKind::FnMut) => Adjustment::Deref { source: DerefSource::MutRef },