https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78124
Bug ID: 78124 Summary: [7 regression][c++1z] explicit inheriting constructor is ignored Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: lucdanton at free dot fr Target Milestone: --- I have bisected this regression to r241188. The program fails to compile in C++1z mode on trunk, yielding this: $ g++-trunk -std=c++1z main.cpp main.cpp: In function 'int main()': main.cpp:11:19: error: could not convert '0' from 'int' to 'base' derived d { 0 }; The testcase: //---------- struct base { explicit constexpr base(int&&) {} }; struct derived: base { using base::base; }; int main() { derived d { 0 }; } //----------