I need to be able to match patterns like this: ‘(PARAMS (x) (lambda (y)

Question

Editorial Team

Asked: May 20, 20262026-05-20T09:30:12+00:00 2026-05-20T09:30:12+00:00

I need to be able to match patterns like this:

‘(PARAMS (x) (lambda (y) (+ x y)))

but the best I can think of returns this:

(match `(PARAMS (x) (lambda (y) (+ x y)))
  [`(PARAMS (,var) (lambda (,arg) (,stmt))) 'yep]
  [otherise 'nope])

==>

nope

Any advice is appreciated.

Thanks.

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Editorial Team · Answer 1 · 2026-05-20T09:30:13+00:00

Editorial Team

Don’t put ,stmt inside parens.

(And BTW, all of these questions are Racket specific, so please use the racket tag.)

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