--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gcc/testsuite/g++.dg/cpp1y/Wnarrowing1.C Thu Feb 13 11:34:05 2020 +0900 @@ -0,0 +1,5 @@ +// PR c++/78244 +// { dg-do compile { target c++14 } } + +template<typename> +decltype(int{1.1}) v; // { dg-error "narrowing conversion" }