ivanzz1001

utf8_range::IsStructurallyValid(std::basic_string_view) is realized in libutf8_validity.a: ``` # strings libutf8_validity.a | grep IsStructurallyValid B_ZN10utf8_range19IsStructurallyValidESt17basic_string_viewIcSt11char_traitsIcEE IsStructurallyValid _ZN10utf8_range19IsStructurallyValidESt17basic_string_viewIcSt11char_traitsIcEE _ZN10utf8_range19IsStructurallyValidESt17basic_string_viewIcSt11char_traitsIcEE ```