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// { dg-do compile { target c++17 } }
// { dg-skip-if "requires hosted libstdc++ for vector" { ! hostedlib } }
#include <vector>
template<class T> struct container {
container(T t) {}
template<class Iter> container(Iter beg, Iter end);
};
template<class Iter>
container(Iter b, Iter e) // { dg-message "iterator_traits.int" }
-> container<typename std::iterator_traits<Iter>::value_type>;
std::vector<double> v = { /* ... */ };
container c(7); // OK, deduces int for T
auto d = container(v.begin(), v.end()); // OK, deduces double for T
container e{5, 6}; // { dg-error "" } int is not an iterator
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