fixes post rebase

Author: kirkshoop

include/exec/variant_tail_sender.hpp

@@ -207,7 +207,7 @@ namespace exec {
           using __f =
             __mapply<
               _Continuation,
-              __minvoke<__fold_right<__types<>, __push_back_flatten<__q<__types>>>, _Ts...>>;
+              __minvoke<__mfold_right<__types<>, __push_back_flatten<__q<__types>>>, _Ts...>>;
       };
 
     template <class _Continuation>

test/exec/test_tail_sender.cpp

@@ -63,8 +63,8 @@ struct ATailReceiver {
   int* called;
   friend void tag_invoke(ex::set_value_t, ATailReceiver&& __self, auto&&...) noexcept { ++*__self.called; }
   friend void tag_invoke(ex::set_stopped_t, ATailReceiver&& __self) noexcept { ++*__self.called; }
-  friend ex::__debug_env_t<ex::__empty_env> tag_invoke(ex::get_env_t, const ATailReceiver&) {
-    return {{}};
+  friend ex::__empty_env tag_invoke(ex::get_env_t, const ATailReceiver&) {
+    return {};
   }
 };
 
@@ -83,8 +83,8 @@ struct ANestTailReceiver {
     ++*__self.called;
     return __self.nested_tail_sender;
   }
-  friend ex::__debug_env_t<ex::__empty_env> tag_invoke(ex::get_env_t, const ANestTailReceiver&) {
-    return {{}};
+  friend ex::__empty_env tag_invoke(ex::get_env_t, const ANestTailReceiver&) {
+    return {};
   }
 };