This doesn't look right at all. Am I using instrument incorrectly?

@mathpunk :args needs to be, at the very least, a collection

you can think of it as, you’re verifying the [s] collection

usually I use s/cat. e.g.:

(s/fdef friendlier
  :args (s/cat :s string?))

ohhhhh

ok i think I see this

(s/cat :s string?) checks if the first element in the sequence is a string

and we're verifying an args /vector/, which happens to have one element

right

it’s actually a sequence, I think. you can see it’s printed as ("World")

ok this makes sense, thank you

and yeah it's right there but i guess i thought those were decorative parens :face_with_rolling_eyes:

yeah 😅 trust me I went through the same confusion the first time I tried to use fdef