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Showing content from https://cplusplus.github.io/LWG/issue3050 below:

Conversion specification problem in chrono::duration constructor

template<class Rep1, class Period, class Rep2>
  constexpr duration<common_type_t<Rep1, Rep2>, Period>
    operator*(const duration<Rep1, Period>& d, const Rep2& s);

-4- Remarks: This operator shall not participate in overload resolution unless is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true Rep2 is implicitly convertible to common_type_t<Rep1, Rep2>.

[…]

template<class Rep1, class Rep2, class Period>
  constexpr duration<common_type_t<Rep1, Rep2>, Period>
    operator*(const Rep1& s, const duration<Rep2, Period>& d);

-6- Remarks: This operator shall not participate in overload resolution unless is_convertible_v<const Rep1&, common_type_t<Rep1, Rep2>> is true Rep1 is implicitly convertible to common_type_t<Rep1, Rep2>.

[…]

template<class Rep1, class Period, class Rep2>
  constexpr duration<common_type_t<Rep1, Rep2>, Period>
    operator/(const duration<Rep1, Period>& d, const Rep2& s);

-8- Remarks: This operator shall not participate in overload resolution unless is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true Rep2 is implicitly convertible to common_type_t<Rep1, Rep2> and Rep2 is not a specialization of duration.

template<class Rep1, class Period, class Rep2>
  constexpr duration<common_type_t<Rep1, Rep2>, Period>
    operator%(const duration<Rep1, Period>& d, const Rep2& s);

-11- Remarks: This operator shall not participate in overload resolution unless is_convertible_v<const Rep2&, common_type_t<Rep1, Rep2>> is true Rep2 is implicitly convertible to common_type_t<Rep1, Rep2> and Rep2 is not a specialization of duration.

[…]

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