Rollup merge of #98705 - WaffleLapkin:closure_binder, r=cjgillot

Implement `for<>` lifetime binder for closures

This PR implements RFC 3216 ([TI](https://github.com/rust-lang/rust/issues/97362)) and allows code like the following:

```rust
let _f = for<'a, 'b> |a: &'a A, b: &'b B| -> &'b C { b.c(a) };
//       ^^^^^^^^^^^--- new!
```

cc ``@Aaron1011`` ``@cjgillot``

2 files changed, 9 insertions, 9 deletions

diff --git a/compiler/rustc_borrowck/src/diagnostics/mod.rs b/compiler/rustc_borrowck/src/diagnostics/mod.rs
index 9c7671eee38..53c07a3d481 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mod.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mod.rs
@@ -891,7 +891,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         let hir_id = self.infcx.tcx.hir().local_def_id_to_hir_id(local_did);
         let expr = &self.infcx.tcx.hir().expect_expr(hir_id).kind;
         debug!("closure_span: hir_id={:?} expr={:?}", hir_id, expr);
-        if let hir::ExprKind::Closure { body, fn_decl_span, .. } = expr {
+        if let hir::ExprKind::Closure(&hir::Closure { body, fn_decl_span, .. }) = expr {
             for (captured_place, place) in self
                 .infcx
                 .tcx
@@ -904,11 +904,11 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                         if target_place == place.as_ref() =>
                     {
                         debug!("closure_span: found captured local {:?}", place);
-                        let body = self.infcx.tcx.hir().body(*body);
+                        let body = self.infcx.tcx.hir().body(body);
                         let generator_kind = body.generator_kind();
 
                         return Some((
-                            *fn_decl_span,
+                            fn_decl_span,
                             generator_kind,
                             captured_place.get_capture_kind_span(self.infcx.tcx),
                             captured_place.get_path_span(self.infcx.tcx),
diff --git a/compiler/rustc_borrowck/src/diagnostics/region_name.rs b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
index e60e11f11df..e41af17fbf9 100644
--- a/compiler/rustc_borrowck/src/diagnostics/region_name.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/region_name.rs
@@ -325,7 +325,7 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                         // Can't have BrEnv in functions, constants or generators.
                         bug!("BrEnv outside of closure.");
                     };
-                    let hir::ExprKind::Closure { fn_decl_span, .. }
+                    let hir::ExprKind::Closure(&hir::Closure { fn_decl_span, .. })
                         = tcx.hir().expect_expr(self.mir_hir_id()).kind
                     else {
                         bug!("Closure is not defined by a closure expr");
@@ -701,16 +701,16 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
 
         let (return_span, mir_description, hir_ty) = match hir.get(mir_hir_id) {
             hir::Node::Expr(hir::Expr {
-                kind: hir::ExprKind::Closure { fn_decl, body, fn_decl_span, .. },
+                kind: hir::ExprKind::Closure(&hir::Closure { fn_decl, body, fn_decl_span, .. }),
                 ..
             }) => {
                 let (mut span, mut hir_ty) = match fn_decl.output {
                     hir::FnRetTy::DefaultReturn(_) => {
-                        (tcx.sess.source_map().end_point(*fn_decl_span), None)
+                        (tcx.sess.source_map().end_point(fn_decl_span), None)
                     }
                     hir::FnRetTy::Return(hir_ty) => (fn_decl.output.span(), Some(hir_ty)),
                 };
-                let mir_description = match hir.body(*body).generator_kind {
+                let mir_description = match hir.body(body).generator_kind {
                     Some(hir::GeneratorKind::Async(gen)) => match gen {
                         hir::AsyncGeneratorKind::Block => " of async block",
                         hir::AsyncGeneratorKind::Closure => " of async closure",
@@ -841,9 +841,9 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
 
         let yield_span = match tcx.hir().get(self.mir_hir_id()) {
             hir::Node::Expr(hir::Expr {
-                kind: hir::ExprKind::Closure { fn_decl_span, .. },
+                kind: hir::ExprKind::Closure(&hir::Closure { fn_decl_span, .. }),
                 ..
-            }) => (tcx.sess.source_map().end_point(*fn_decl_span)),
+            }) => (tcx.sess.source_map().end_point(fn_decl_span)),
             _ => self.body.span,
         };