hyperfiddle / hyperfiddle/rcf

RCF rewriting varadic fns (fn [& xs]) wrong

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Dominant language
Clojure
Stars
301
Forks
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PR merge metrics
No merged PRs in 30d

Description

(def vector' (fn [& xs] (apply vector xs)))
(tests
  (vector 1 2 3) := [1 2 3]
  (vector' 1 2 3) := [1 2 3])
✅✅
(tests
  (vector 1 2 3) := [1 2 3]
  (def vector' (fn [& xs] (apply vector xs)))
  (vector' 1 2 3) := [1 2 3])
✅
ERROR in () (:)
expected: (hyperfiddle.rcf/= (vector' 1 2 3) [1 2 3])
  actual: clojure.lang.ArityException: Wrong number of args (3) passed to: dustin.y2022.missionary-faq/eval8620/vector'--8625

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Research direction

Reproduce the issue with the shown Clojure forms, comparing a direct variadic function call with the same definition inside tests. Trace RCF's rewriting of the fn form and verify that a variadic function remains callable with multiple arguments without the reported arity error.

Written by the indexing model from the issue text.

Assessment

Tech stack
clojure
Domain
testing
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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