Undefined reference to static function in unused mixin lambda #22848
Description
Looks like dmd skips codegen for pred, but not for accept which takes pred as a template parameter, leading to a linker error.
mixin template Main(alias mainFunction) {}
mixin Main!(()
{
static bool pred(char c) => false;
accept!pred;
});
char accept(alias pred)() => pred(0);./onlineapp.d:9: error: undefined reference to '_D9onlineapp15__lambda_L3_C13FZ4predFNaNbNiNfaZb'