[r6rs-discuss] peculiar semantics for a predicate

[William D Clinger]

According to R6RS library chapter 13, the argument to
hashtable? *must* be a hashtable, which means the
hashtable? predicate always returns true.  When given
a non-hashtable as an argument, it raises an exception
instead of returning.

I doubt whether this was the intended semantics, but
those of us who take R6RS conformance seriously will
implement it faithfully.

Will