Build DebugInfo for async closures

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -461,6 +461,7 @@ pub fn type_di_node<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>, t: Ty<'tcx>) -> &'ll D
         }
         ty::FnDef(..) | ty::FnPtr(_) => build_subroutine_type_di_node(cx, unique_type_id),
         ty::Closure(..) => build_closure_env_di_node(cx, unique_type_id),
+        ty::CoroutineClosure(..) => build_closure_env_di_node(cx, unique_type_id),
         ty::Coroutine(..) => enums::build_coroutine_di_node(cx, unique_type_id),
         ty::Adt(def, ..) => match def.adt_kind() {
             AdtKind::Struct => build_struct_type_di_node(cx, unique_type_id),
@@ -1068,6 +1069,7 @@ fn build_upvar_field_di_nodes<'ll, 'tcx>(
     let (&def_id, up_var_tys) = match closure_or_coroutine_ty.kind() {
         ty::Coroutine(def_id, args) => (def_id, args.as_coroutine().prefix_tys()),
         ty::Closure(def_id, args) => (def_id, args.as_closure().upvar_tys()),
+        ty::CoroutineClosure(def_id, args) => (def_id, args.as_coroutine_closure().upvar_tys()),
         _ => {
             bug!(
                 "build_upvar_field_di_nodes() called with non-closure-or-coroutine-type: {:?}",
@@ -1153,7 +1155,8 @@ fn build_closure_env_di_node<'ll, 'tcx>(
     unique_type_id: UniqueTypeId<'tcx>,
 ) -> DINodeCreationResult<'ll> {
     let closure_env_type = unique_type_id.expect_ty();
-    let &ty::Closure(def_id, _args) = closure_env_type.kind() else {
+    let &(ty::Closure(def_id, _) | ty::CoroutineClosure(def_id, _)) = closure_env_type.kind()
+    else {
         bug!("build_closure_env_di_node() called with non-closure-type: {:?}", closure_env_type)
     };
     let containing_scope = get_namespace_for_item(cx, def_id);

tests/codegen/async-closure-debug.rs

@@ -0,0 +1,21 @@
+// Just make sure that async closures don't ICE.
+//
+// compile-flags: -C debuginfo=2 --edition=2018
+// ignore-msvc
+
+// CHECK-DAG:  [[GEN_FN:!.*]] = !DINamespace(name: "async_closure_test"
+// CHECK-DAG:  [[CLOSURE:!.*]] = !DICompositeType(tag: DW_TAG_structure_type, name: "{closure_env#0}", scope: [[GEN_FN]]
+// CHECK-DAG:  [[UPVAR:!.*]] = !DIDerivedType(tag: DW_TAG_member, name: "upvar", scope: [[CLOSURE]]
+
+#![feature(async_closure)]
+
+fn async_closure_test(upvar: &str) -> impl async Fn() + '_ {
+    async move || {
+        let hello = String::from("hello");
+        println!("{hello}, {upvar}");
+    }
+}
+
+fn main() {
+    let _async_closure = async_closure_test("world");
+}

tests/ui/async-await/async-closures/async-fn-mut-for-async-fn.rs

@@ -2,9 +2,6 @@
 // edition:2021
 // run-pass
 
-// FIXME(async_closures): When `fn_sig_for_fn_abi` is fixed, remove this.
-// ignore-pass (test emits codegen-time warnings)
-
 #![feature(async_closure)]
 
 extern crate block_on;

tests/ui/async-await/async-closures/async-fn-once-for-async-fn.rs

@@ -2,9 +2,6 @@
 // edition:2021
 // run-pass
 
-// FIXME(async_closures): When `fn_sig_for_fn_abi` is fixed, remove this.
-// ignore-pass (test emits codegen-time warnings)
-
 #![feature(async_closure)]
 
 extern crate block_on;