https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83258
--- Comment #10 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> --- Another workaround, extended from Bug 92320's example. See https://godbolt.org/z/69onWf. You can wrap the closure object in a template function which itself invokes the closure object and converts to a function pointer that GCC accepts. ```C++ template<auto V> void templ() {} void dummy(){} template<auto F> void fn(){F();} void foo() { constexpr int a = 7 + 3; templ<a>(); templ<dummy>(); typedef void(FPtr)(); constexpr FPtr * b = &dummy; templ<b>(); constexpr auto l = []{}; constexpr void (*d)()=fn<l>; templ<d>(); constexpr FPtr * c = [](){}; templ<c>(); } ```
