Some more minor async gen-related nits

compiler/rustc_ast/src/ast.rs

@@ -2450,6 +2450,14 @@ impl CoroutineKind {
         matches!(self, CoroutineKind::Gen { .. })
     }
 
+    pub fn closure_id(self) -> NodeId {
+        match self {
+            CoroutineKind::Async { closure_id, .. }
+            | CoroutineKind::Gen { closure_id, .. }
+            | CoroutineKind::AsyncGen { closure_id, .. } => closure_id,
+        }
+    }
+
     /// In this case this is an `async` or `gen` return, the `NodeId` for the generated `impl Trait`
     /// item.
     pub fn return_id(self) -> (NodeId, Span) {

compiler/rustc_ast_lowering/src/item.rs

@@ -1035,10 +1035,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
         let (Some(coroutine_kind), Some(body)) = (coroutine_kind, body) else {
             return self.lower_fn_body_block(span, decl, body);
         };
-        // FIXME(gen_blocks): Introduce `closure_id` method and remove ALL destructuring.
-        let (CoroutineKind::Async { closure_id, .. }
-        | CoroutineKind::Gen { closure_id, .. }
-        | CoroutineKind::AsyncGen { closure_id, .. }) = coroutine_kind;
+        let closure_id = coroutine_kind.closure_id();
 
         self.lower_body(|this| {
             let mut parameters: Vec<hir::Param<'_>> = Vec::new();

compiler/rustc_ast_lowering/src/lib.rs

@@ -177,7 +177,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             } else {
                 [sym::gen_future].into()
             },
-            // FIXME(gen_blocks): how does `closure_track_caller`
+            // FIXME(gen_blocks): how does `closure_track_caller`/`async_fn_track_caller`
+            // interact with `gen`/`async gen` blocks
             allow_async_iterator: [sym::gen_future, sym::async_iterator].into(),
             generics_def_id_map: Default::default(),
             host_param_id: None,

compiler/rustc_ast_passes/src/ast_validation.rs

@@ -1271,11 +1271,11 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
         // Functions cannot both be `const async` or `const gen`
         if let Some(&FnHeader {
             constness: Const::Yes(cspan),
-            coroutine_kind: Some(coro_kind),
+            coroutine_kind: Some(coroutine_kind),
             ..
         }) = fk.header()
         {
-            let aspan = match coro_kind {
+            let aspan = match coroutine_kind {
                 CoroutineKind::Async { span: aspan, .. }
                 | CoroutineKind::Gen { span: aspan, .. }
                 | CoroutineKind::AsyncGen { span: aspan, .. } => aspan,

compiler/rustc_builtin_macros/src/test.rs

@@ -541,8 +541,8 @@ fn check_test_signature(
         return Err(sd.emit_err(errors::TestBadFn { span: i.span, cause: span, kind: "unsafe" }));
     }
 
-    if let Some(coro_kind) = f.sig.header.coroutine_kind {
-        match coro_kind {
+    if let Some(coroutine_kind) = f.sig.header.coroutine_kind {
+        match coroutine_kind {
             ast::CoroutineKind::Async { span, .. } => {
                 return Err(sd.emit_err(errors::TestBadFn {
                     span: i.span,

compiler/rustc_lint/src/early.rs

@@ -162,11 +162,8 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
         // Explicitly check for lints associated with 'closure_id', since
         // it does not have a corresponding AST node
         if let ast_visit::FnKind::Fn(_, _, sig, _, _, _) = fk {
-            if let Some(coro_kind) = sig.header.coroutine_kind {
-                let (ast::CoroutineKind::Async { closure_id, .. }
-                | ast::CoroutineKind::Gen { closure_id, .. }
-                | ast::CoroutineKind::AsyncGen { closure_id, .. }) = coro_kind;
-                self.check_id(closure_id);
+            if let Some(coroutine_kind) = sig.header.coroutine_kind {
+                self.check_id(coroutine_kind.closure_id());
             }
         }
     }
@@ -226,12 +223,10 @@ impl<'a, T: EarlyLintPass> ast_visit::Visitor<'a> for EarlyContextAndPass<'a, T>
         // it does not have a corresponding AST node
         match e.kind {
             ast::ExprKind::Closure(box ast::Closure {
-                coroutine_kind: Some(coro_kind), ..
+                coroutine_kind: Some(coroutine_kind),
+                ..
             }) => {
-                let (ast::CoroutineKind::Async { closure_id, .. }
-                | ast::CoroutineKind::Gen { closure_id, .. }
-                | ast::CoroutineKind::AsyncGen { closure_id, .. }) = coro_kind;
-                self.check_id(closure_id);
+                self.check_id(coroutine_kind.closure_id());
             }
             _ => {}
         }

compiler/rustc_resolve/src/def_collector.rs

@@ -157,11 +157,7 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
     fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
         if let FnKind::Fn(_, _, sig, _, generics, body) = fn_kind {
             match sig.header.coroutine_kind {
-                Some(
-                    CoroutineKind::Async { closure_id, .. }
-                    | CoroutineKind::Gen { closure_id, .. }
-                    | CoroutineKind::AsyncGen { closure_id, .. },
-                ) => {
+                Some(coroutine_kind) => {
                     self.visit_generics(generics);
 
                     // For async functions, we need to create their inner defs inside of a
@@ -176,8 +172,12 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                     // then the closure_def will never be used, and we should avoid generating a
                     // def-id for it.
                     if let Some(body) = body {
-                        let closure_def =
-                            self.create_def(closure_id, kw::Empty, DefKind::Closure, span);
+                        let closure_def = self.create_def(
+                            coroutine_kind.closure_id(),
+                            kw::Empty,
+                            DefKind::Closure,
+                            span,
+                        );
                         self.with_parent(closure_def, |this| this.visit_block(body));
                     }
                     return;
@@ -289,11 +289,12 @@ impl<'a, 'b, 'tcx> visit::Visitor<'a> for DefCollector<'a, 'b, 'tcx> {
                 // we must create two defs.
                 let closure_def = self.create_def(expr.id, kw::Empty, DefKind::Closure, expr.span);
                 match closure.coroutine_kind {
-                    Some(
-                        CoroutineKind::Async { closure_id, .. }
-                        | CoroutineKind::Gen { closure_id, .. }
-                        | CoroutineKind::AsyncGen { closure_id, .. },
-                    ) => self.create_def(closure_id, kw::Empty, DefKind::Closure, expr.span),
+                    Some(coroutine_kind) => self.create_def(
+                        coroutine_kind.closure_id(),
+                        kw::Empty,
+                        DefKind::Closure,
+                        expr.span,
+                    ),
                     None => closure_def,
                 }
             }

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -3144,10 +3144,9 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 let what = match self.tcx.coroutine_kind(coroutine_def_id) {
                     None
                     | Some(hir::CoroutineKind::Coroutine)
-                    | Some(hir::CoroutineKind::Gen(_))
-                    // FIXME(gen_blocks): This could be yield or await...
-                    | Some(hir::CoroutineKind::AsyncGen(_)) => "yield",
+                    | Some(hir::CoroutineKind::Gen(_)) => "yield",
                     Some(hir::CoroutineKind::Async(..)) => "await",
+                    Some(hir::CoroutineKind::AsyncGen(_)) => "yield`/`await",
                 };
                 err.note(format!(
                     "all values live across `{what}` must have a statically known size"