Related: https://stackoverflow.com/questions/5508110/why-is-this-program-erroneously-rejected-by-three-c-compilers

That’s an aladeen idea!

Syntax error: unmatched thing in thing from std::nonstd::__map<_Cyrillic, _$$$dollars>const basic_string< epic_mystery,mongoose_traits, __default_alloc_>

(from James Mickens’ The Night Watch, highly recommended with his other essays: https://mickens.seas.harvard.edu/wisdom-james-mickens)