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[ASYNC-62] recur across try possible, leaks ExceptionFrames Created: 27/Mar/14  Updated: 23/Jun/14  Resolved: 23/Jun/14

Status: Closed
Project: core.async
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Defect Priority: Major
Reporter: Philip Lewis Assignee: Unassigned
Resolution: Not Reproducible Votes: 0
Labels: None

[org.clojure/clojure "1.5.1"]
[org.clojure/core.async ""]


This shouldn't compile, but it does and generates nested ExceptionFrames until it crashes:

(go-loop [] (try (if 1 (recur))))

Without the if, it throws java.lang.IllegalArgumentException: No implementation of method: :emit-instruction of protocol: #'clojure.core.async.impl.ioc-macros/IEmittableInstruction found for class: clojure.core.async.impl.ioc_macros.Jmp.

Outside of a go block it throws an UnsupportedOperationException (either "can only recur from tail" or "cannot recur across try").

Comment by Alex Miller [ 23/Jun/14 10:59 AM ]

On latest CLJ version (0.1.303.0-886421-alpha), I see "java.lang.UnsupportedOperationException: Can only recur from tail position" from this code.

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