Find longest identifier in C++ Standard.
$ ./cpplongestid.py
atomic_compare_exchange_strong_explicit 39
hardware_constructive_interference_size 39
hardware_destructive_interference_size 38
propagate_on_container_copy_assignment 38
propagate_on_container_move_assignment 38
atomic_compare_exchange_weak_explicit 37
select_on_container_copy_construction 37
is_trivially_default_constructible_v 36
has_unique_object_representations_v 35
...
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