[Trivial] Future proof rippled by changing variable name 'requires' to 'require' #3821
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'requires' is a keyword in C++20.
https://en.cppreference.com/w/cpp/keyword/requires
This is the least intrusive change. Another option is to rename the require class (and the associated variable name) to something else. If the latter is desired, I will make the change. Please let me know what you think. Thanks!