fix real-concepts builds

Summary: removed constraints that are no longer valid.

Reviewed By: ericniebler

Differential Revision: D14606943

fbshipit-source-id: bf7acb88e3b6202caaa3e1333d88e5c516eb18e3

folly/experimental/pushmi/flow_many_sender.h

@@ -132,7 +132,7 @@ class flow_many_sender<SF> {
   }
 };
 
-template <PUSHMI_TYPE_CONSTRAINT(Sender<is_many<>, is_flow<>>) Data, class DSF>
+template <PUSHMI_TYPE_CONSTRAINT(Sender) Data, class DSF>
 class flow_many_sender<Data, DSF> {
   Data data_;
   DSF sf_;

folly/experimental/pushmi/flow_single_sender.h

@@ -140,7 +140,7 @@ class flow_single_sender<SF> {
 };
 
 template <
-    PUSHMI_TYPE_CONSTRAINT(Sender<is_single<>, is_flow<>>) Data,
+    PUSHMI_TYPE_CONSTRAINT(Sender) Data,
     class DSF>
 class flow_single_sender<Data, DSF> {
   Data data_;

folly/experimental/pushmi/many_sender.h

@@ -134,7 +134,7 @@ class many_sender<SF> {
   }
 };
 
-template <PUSHMI_TYPE_CONSTRAINT(Sender<is_many<>>) Data, class DSF>
+template <PUSHMI_TYPE_CONSTRAINT(Sender) Data, class DSF>
 class many_sender<Data, DSF> {
   Data data_;
   DSF sf_;

folly/experimental/pushmi/single_sender.h

@@ -169,7 +169,7 @@ class single_sender<SF> {
 };
 
 template <
-    PUSHMI_TYPE_CONSTRAINT(Sender<is_single<>>) Data,
+    PUSHMI_TYPE_CONSTRAINT(Sender) Data,
     class DSF>
 class single_sender<Data, DSF> {
   Data data_;