[racket] define-predicate problem with HashTable type constructor

This

#lang typed/racket
(define-type X (HashTable Symbol String))
(define-predicate x? X)

in drracket 5.3.6, gives me

Type Checker: Type X could not be converted to a contract. in: X

This is reduced out of a more complex type (jsexpr). Removing this bit
removes the error. Is this is a bug? If so, is it easy enough to fix?

I can revert to the non-typed library for now, but have just starting to
convert my app over to typed/racket...

Thanks, Erik.
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