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compile c++ clang online

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Compilation time: 2.04 sec, absolute service time: 2.11 sec 
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Error(s):
source_file.cpp:46:5: error: no matching function for call to 'print'
    print(fmt, "World", 42);
    ^~~~~
source_file.cpp:36:6: note: candidate function [with Args = <char const (&)[6], int>] not viable: no known conversion from 'std::string' (aka 'basic_string<char, char_traits<char>, allocator<char> >') to 'std::string &&' (aka 'basic_string<char, char_traits<char>, allocator<char> > &&') for 1st argument
void print(std::string&& fmt, Args&&... args)
     ^
1 error generated.