is processed as follows: The string-literal is destringized
by deleting the L prefix, if present, deleting the leading and trailing
double-quotes, replacing each escape sequence \" by a double-quote, and
replacing each escape sequence \\ by a single
The resulting sequence of characters is processed through translation phase 3
to produce preprocessing tokens that are executed as if they were the
pp-tokens in a pragma directive.
The original four preprocessing
tokens in the unary operator expression are removed.