bumping windows test.

Author: klemens-morgenstern

example/stdio.cpp

@@ -55,6 +55,8 @@ int main(int argc, char *argv[])
     process proc(ctx, "~/not-a-virus", {}, process_stdio{sock, sock, nullptr});
     proc.wait();
     //end::native_handle[]
+    using err_t = decltype(process_stdio{}.err);
+    err_t err{sock};
   }
   {
     //tag::popen[]

include/boost/process/v2/stdio.hpp

@@ -80,7 +80,7 @@ struct process_io_binding
   process_io_binding() = default;
 
   template<typename Stream>
-  process_io_binding(Stream && str, decltype(std::declval<Stream>().native_handle()) = {})
+  process_io_binding(Stream && str, decltype(std::declval<Stream>().native_handle())* = nullptr)
       : process_io_binding(str.native_handle())
   {}
 
@@ -166,7 +166,7 @@ struct process_io_binding
   process_io_binding() = default;
 
   template<typename Stream>
-  process_io_binding(Stream && str, decltype(std::declval<Stream>().native_handle()) = {})
+  process_io_binding(Stream && str, decltype(std::declval<Stream>().native_handle()) * = nullptr)
           : process_io_binding(str.native_handle())
   {}