#include <string>
int main(){
std::string s1 = "foo";
std::string s2 = s1[1];
}
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prog.cpp: In function ‘int main()’:
prog.cpp:5: error: invalid conversion from ‘char’ to ‘const char*’
prog.cpp:5: error: initializing argument 1 of ‘std::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]’