property_tree/detail/file_parser_error.hpp does not #include <sstream>

[urnathan]

This was discovered when enabling clang implicit modules (and by implication will affect C++20 header-units). property_tree/detail/file_parser_error.hpp uses stringstream without #including , and therefore is not self contained. Fixed thusly:

--- c/1.77.0/src/boost_1_77_0/boost/property_tree/detail/file_parser_error.hpp
+++ w/1.77.0/src/boost_1_77_0/boost/property_tree/detail/file_parser_error.hpp
@@ -12,6 +12,7 @@
 
 #include <boost/property_tree/ptree.hpp>
 #include <string>
+#include <sstream>
 
 namespace boost { namespace property_tree
 {

[madmongo1]

Thank you.

[ashtum]

Addressed in #112.