copyconstructible
`CopyConstructible` requirements (in addition to `MoveConstructible`)
tab:charname.disallowed
Ranges of characters disallowed initially (combining characters)
tab:filesystem_error.2
`filesystem_error(const string&, const path&, error_code)` effects
tab:filesystem_error.3
`filesystem_error(const string&, const path&, const path&, error_code)` effects
tab:string.view.comparison.overloads
Additional `basic_string_view` comparison overloads
tab:strings.ctr.2
`basic_string(const basic_string&, size_type, size_type, const Allocator&)` effects