llvm/libcxx/test/libcxx/input.output/iostream.format/input.streams/traits_mismatch.verify.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <istream>

// template <class charT, class traits = char_traits<charT> >
// class basic_istream;

// The char type of the stream and the char_type of the traits have to match

// UNSUPPORTED: no-wide-characters

#include <istream>
#include <string>

struct test_istream
    : public std::basic_istream<char, std::char_traits<wchar_t> > {};

// expected-error-re@ios:* {{static assertion failed{{.*}}traits_type::char_type must be the same type as CharT}}
// expected-error@istream:* {{only virtual member functions can be marked 'override'}}