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1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include <assert.h>
11 #include <ext/hash_map>
12 #include <string>
13 
main()14 int main()
15 {
16     assert(__gnu_cxx::hash<std::string>()(std::string()) == 0);  // error
17 }
18