parse-define-struct will parse an expression with anything in the
"define-struct" position; e.g.,
(let ([s #'(anything-goes m (a b))])
(parse-define-struct s s))
succeeds. However, it is strict about what goes in the field
positions, e.g., it cannot be used to parse
(let ([s #'(anything-goes m ([a : 2] [b : 3]))])
(parse-define-struct s s))
Is the conservatism of the head position just an artifact of an _ in a
macro, or is it an actual feature that is used for some purpose?
Shriram
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