Tensegritics / Tensegritics/ClojureDart

Reader conditional selects :clj branch if it comes before :cljd

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#25 4 comments 0 reactions 0 assignees View on GitHub

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bug
Dominant language
Clojure
Stars
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Forks
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Description

see https://clojurians.slack.com/archives/C03A6GE8D32/p1650332155679279

;; okay
(println #?(:cljd 1
            :clj (Integer/parseInt "2")
            :default nil))
;; KO
(println #?(:clj (Integer/parseInt "2")
            :cljd 1
            :default nil))
Something horrible happened! 😱
Error while compiling Integer/parseInt
Integer/parseInt
(Integer/parseInt "2")
(println (Integer/parseInt "2"))
(let* [] (println (Integer/parseInt "2")))
(do (println (Integer/parseInt "2")))
(fn* ([] (println (Integer/parseInt "2"))))
(defn main [] (println (Integer/parseInt "2")))
Unknown symbol: Integer/parseInt at line: 5, column: 20, file: quickstart/helloworld.cljc

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the two reader-conditional examples from the issue in ClojureDart, comparing the branch order and resulting compilation error. Trace the reader-conditional handling to determine why :clj is selected or compiled before :cljd; done means both orderings select :cljd and do not compile the inactive :clj branch.

Written by the indexing model from the issue text.

Assessment

Tech stack
clojure, dart
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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