gcc/gcc/testsuite/g++.dg/ext/utf-badconcat2.C

// Test unsupported concatenation of UTF-8 string literals.
// { dg-do compile }
// { dg-options "-std=c++0x" }

const void *s0	= u8"a"   "b";
const void *s1	=   "a" u8"b";
const void *s2	= u8"a" u8"b";
const void *s3	= u8"a"  u"b";	// { dg-error "non-standard concatenation" }
const void *s4	=  u"a" u8"b";	// { dg-error "non-standard concatenation" }
const void *s5	= u8"a"  U"b";	// { dg-error "non-standard concatenation" }
const void *s6	=  U"a" u8"b";	// { dg-error "non-standard concatenation" }
const void *s7	= u8"a"  L"b";	// { dg-error "non-standard concatenation" }
const void *s8	=  L"a" u8"b";	// { dg-error "non-standard concatenation" }

int main () {}