added a note clarifying post_type() recursion
added a note clarifying post_type() recursion

some ancient pre-K&R C allows a function to return an array
and the array brackets to be put after the arguments, such
that "int c()[]" means the same as "int[] c()"
see:
http://llvm.org/bugs/show_bug.cgi?id=2399
http://java.sun.com/docs/books/jls/third_edition/html/classes.html#38703

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