CppCon 2018, Nicolai Josuttis: Why are these interpreted as iterators?

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Below code 

std::vector< std::string > v07 = { { "1", "2" } };

is equivalent to

std::string s = {"1","2"}; // call string(const char*, const char*)
std::vector<std::string> v07 = {s}; // initializer list with one item

the issue is with 

   s={"1","2"};

This calls string(const char* start, const char* end) constructor,
but start and end must refer to the same string object. “1” and “2” are two different objects, so it leads to UB.

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