text: /* { dg-do preprocess } */
  /* { dg-options "-std=c11 -pedantic" { target c } } */
  /* { dg-options "-std=c++11 -pedantic" { target c++ } } */
  
  \u00A8
  
  B\u0300
  
  \u0300 /* { dg-error "not valid at the start of an identifier" } */
  
  A\u0300 /* { dg-warning "not in NFC" } */
  
  \U00010000
  \U0001FFFD
  \U000E1234
  