llvm-project/clang/test/SemaCXX/cxx1z-user-defined-literals...

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C++

// RUN: %clang_cc1 -std=c++1z %s -include %s -verify
#ifndef INCLUDED
#define INCLUDED
#pragma clang system_header
namespace std {
using size_t = decltype(sizeof(0));
struct string_view {};
string_view operator""sv(const char*, size_t);
}
#else
using namespace std;
string_view s = "foo"sv;
const char* p = "bar"sv; // expected-error {{no viable conversion}}
char error = 'x'sv; // expected-error {{invalid suffix}} expected-error {{expected ';'}}
#endif