LWG3956 chrono::parse uses from_stream as a customization point

Author: burblebee

source/lib-intro.tex

@@ -1121,7 +1121,8 @@
 
 \pnum
 Whenever an unqualified name other than
-\tcode{swap}, \tcode{make_error_code}, \tcode{make_error_condition}, or
+\tcode{swap}, \tcode{make_error_code}, \tcode{make_error_condition},
+\tcode{from_stream}, or
 \tcode{submdspan_mapping}
 is used in the specification of a declaration \tcode{D}
 in \ref{\firstlibchapter} through \ref{\lastlibchapter} or \ref{depr},
@@ -1145,7 +1146,8 @@
 in an overload resolution context
 for swappable values\iref{swappable.requirements}.
 The meanings of the unqualified names
-\tcode{make_error_code}, \tcode{make_error_condition}, and
+\tcode{make_error_code}, \tcode{make_error_condition},
+\tcode{from_stream}, and
 \tcode{submdspan_mapping}
 are established
 as-if by performing argument-dependent lookup\iref{basic.lookup.argdep}.