Arthur O'Dwyer 7f1baa3768 Fix Clang's -Wdeprecated-copy warnings in C++20.
This is a more aggressively "modern" approach than my first few attempts.
Apparently we can't just follow the Rule of Zero for the `Ne` matcher in
particular, because if we do, one of the unit tests hits
"recursive template instantiation exceeded maximum depth of 256"
on Clang.

Fixes #1305.
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