typeset: hash with no srcloc fails to render

[sorawee]

@(define-syntax (test stx)
   (with-syntax ([(xs ...) '(1 2 3 4)]
                 [hs (hash 1 2 3 4)])
     #'@racketblock[#(xs ...)
                    (xs ...)
                    '(xs ...)
                    hs]))

@(test)

fails to render due to the hs row.