gistfile1.txt

In translation phase 6, the multibyte character sequences specified by any sequence of
adjacent character and identically-prefixed string literal tokens are concatenated into a
single multibyte character sequence. If any of the tokens has an encoding prefix, the
resulting multibyte character sequence is treated as having the same prefix; otherwise, it
is treated as a character string literal. Whether differently-prefixed wide string literal
tokens can be concatenated and, if so, the treatment of the resulting multibyte character
sequence are implementation-defined.