tree 656f7c3930352b7e364079e76b2ce4c29afcea36
parent 86f3548e375d216b94619bcb74c1a7144ac33ba3
author Filip Niksic <fniksic@google.com> 1684367970 -0400
committer Filip Niksic <fniksic@google.com> 1684370630 -0400

Switch to requiring AbslStringify instead operator<< for printing user values.

AbslStringify avoids the pitfalls of overly broad template definitions of
operator<< that unintentionally capture user types that can't actually be
streamed. We've seen cases of this occurring for std::vector<T> for types
T that don't implement operator<<.

PiperOrigin-RevId: 532954572