[Webkit-unassigned] [Bug 226251] include\optional(95, 5): error: the parameter for this explicitly-defaulted copy constructor is const, but a member or base requires it to be non-const

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226251

--- Comment #2 from Fujii Hironori <Hironori.Fujii at sony.com> ---
This?

c++ - When are special member functions of a template class instantiated? - Stack Overflow
https://stackoverflow.com/q/10370713

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