gcc/testsuite/g++.dg/cpp1y/udlit-enc-prefix-neg.C

// { dg-do compile { target c++14 } }

int
operator L""_Ls(unsigned long long) // { dg-error "invalid encoding prefix in literal operator" }
{ return 0; }

int
operator u""_s16(unsigned long long) // { dg-error "invalid encoding prefix in literal operator" }
{ return 0; }

int
operator U""_s32(unsigned long long) // { dg-error "invalid encoding prefix in literal operator" }
{ return 0; }

int
operator u8""_u8s(unsigned long long) // { dg-error "invalid encoding prefix in literal operator" }
{ return 0; }