Details
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Type:
Defect
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Status:
Open
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Priority:
Major
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Resolution: Unresolved
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Affects Version/s: Approved Backlog
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Fix Version/s: Release 1.6
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Component/s: None
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Labels:None
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Environment:Clojure commit 9052ca1854b7b6202dba21fe2a45183a4534c501, version 1.3.0-master-SNAPSHOT
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Approval:Vetted
Description
(set! *warn-on-reflection* true)
(fn [] (loop [b 0] (recur (loop [a 1] a))))
Generates the following warnings:
recur arg for primitive local: b is not matching primitive, had: Object, needed: long Auto-boxing loop arg: b
This is interesting for several reasons. For one, if the arg to recur is a let form, there is no warning:
(fn [] (loop [b 0] (recur (let [a 1] a))))
Also, the compiler appears to understand the return type of loop forms just fine:
(use '[clojure.contrib.repl-utils :only [expression-info]])
(expression-info '(loop [a 1] a))
;=> {:class long, :primitive? true}
The problem can of course be worked around using an explicit cast on the loop form:
(fn [] (loop [b 0] (recur (long (loop [a 1] a)))))
Reported by leafw in IRC: http://clojure-log.n01se.net/date/2011-01-03.html#10:31