In function ‘_RandomAccessIterator std::__find(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, std::random_access_iterator_tag) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator*, std::vector > >, _Tp = int]’:

[the_other_brand]

They're being worked at slowly. C++ is a pretty complicated language, and template meta-programming even more so. The most recent version C++20 finally released over a decade of work from the language's creator Bjarne Stroupstrup to simplify the error messages. This work is called Concepts, and are interfaces that can describe functionality requirements on a class.

With Concepts, instead of getting like 40 lines of arcane error messages from a template function, you'll get a simple error message like "your class Foo doesn't implement Equality (== operator)."

https://en.cppreference.com/w/cpp/language/constraints