Modifies how Arg, Arm, Field, FieldPattern and Variant are visited

Part of the necessary work to accomplish #63468.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
index 72f2c1375e7..92b48ed62cd 100644
--- a/src/libsyntax/ext/expand.rs
+++ b/src/libsyntax/ext/expand.rs
@@ -1210,9 +1210,13 @@ impl<'a, 'b> MutVisitor for InvocationCollector<'a, 'b> {
         }
     }
 
-    fn visit_generic_params(&mut self, params: &mut Vec<ast::GenericParam>) {
-        self.cfg.configure_generic_params(params);
-        noop_visit_generic_params(params, self);
+   fn flat_map_generic_param(
+       &mut self,
+       param: ast::GenericParam
+    ) -> SmallVec<[ast::GenericParam; 1]>
+    {
+        let param = configure!(self, param);
+        noop_flat_map_generic_param(param, self)
     }
 
     fn visit_attribute(&mut self, at: &mut ast::Attribute) {