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Identifiers  An IDENTIFIER_NODE represents a slightly more
general concept that the standard C or C++ concept of
identifier. In particular, an IDENTIFIER_NODE may contain a `$',
or other extraordinary characters.  There are never two distinct
IDENTIFIER_NODEs representing the same identifier. Therefore,
you may use pointer equality to compare IDENTIFIER_NODEs, rather
than using a routine like strcmp.  You can use the following
macros to access identifiers:  The string represented by the
identifier, represented as a char*. This string is always NUL-
terminated, and contains no embedded NUL characters. The length
of the string returned by IDENTIFIER_POINTER, not including the
trailing NUL. This value of IDENTIFIER_LENGTH (x) is always the
same as strlen (IDENTIFIER_POINTER (x)). This predicate holds if
the identifier represents the name of an overloaded operator. In
this case, you should not depend on the contents of either the
IDENTIFIER_POINTER o