feat(ast_tools): support #[scope(exit_after)]

tasks/ast_tools/src/generators/visit.rs

@@ -481,6 +481,7 @@ impl<'a> VisitBuilder<'a> {
                 let visit_args = markers.visit.visit_args.clone();
 
                 let have_enter_scope = markers.scope.enter_before;
+                let have_exit_scope = markers.scope.exit_after;
                 let have_enter_node = markers.visit.enter_before;
 
                 let (args_def, args) = visit_args
@@ -525,6 +526,13 @@ impl<'a> VisitBuilder<'a> {
                     };
                     enter_scope_at = ix;
                 }
+                if have_exit_scope {
+                    let scope_leave = &scope_events.1;
+                    result = quote! {
+                        #result
+                        #scope_leave
+                    };
+                }
 
                 #[expect(unreachable_code)]
                 if have_enter_node {

tasks/ast_tools/src/markers.rs

@@ -64,7 +64,10 @@ pub struct VisitMarkers {
 /// A struct representing `#[scope(...)]` markers
 #[derive(Default, Debug)]
 pub struct ScopeMarkers {
+    /// `#[scope(enter_before)]`
     pub enter_before: bool,
+    /// `#[scope(exit_after)]`
+    pub exit_after: bool,
 }
 
 /// A struct representing all the helper attributes that might be used with `#[generate_derive(...)]`
@@ -204,7 +207,10 @@ where
         || Ok(ScopeMarkers::default()),
         |attr| {
             attr.parse_args_with(Ident::parse)
-                .map(|id| ScopeMarkers { enter_before: id == "enter_before" })
+                .map(|id| ScopeMarkers {
+                    enter_before: id == "enter_before",
+                    exit_after: id == "exit_after",
+                })
                 .normalize()
         },
     )