Indicate where chunks are continued, instead of always appending chunks with the same name.

[SuzanneSoy]

Make the following code work, the <…> indicates that subsequent chunks with the same name should be inserted there, instead of being appended.

@chunk[<foo>
       (define-syntax foo
         (syntax-parser
           [first-case first-result]
           <…>]

@chunk[<foo>
           [second-case second-result]]

@chunk[<foo>
           [second-case second-result]]