Tests if a term is an integer literal of type :real.
DESCRIPTION
The call is_realintconst t tests whether the term t is a canonical integer
literal of type :real, i.e. either `&n' for a numeral n or `-- &n' for
a nonzero numeral n. If so it returns true, otherwise false.
FAILURE CONDITIONS
Never fails.
EXAMPLE
# is_realintconst `-- &3 :real`;;
val it : bool = true
# is_realintconst `&1 :int`;;
val it : bool = false