Return value containing both count() and listily() returns AlgebricksException

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What steps will reproduce the problem?
Beta release, using TinySocial for the following query:

use dataverse TinySocial;

let $l2 := for $i in dataset TwitterUsers return $i
return {"count2": count($l2), "l2": $l2}

What is the expected output? What do you see instead?
Should return the count and the content of the list, however the following 
exception is thrown:

Could not infer type for variable '$$3'. [AlgebricksException]

Original issue reported on code.google.com by jarod...@gmail.com on 11 Jun 2013 at 4:38

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Original comment by jarod...@gmail.com on 18 Nov 2013 at 11:11

• Added labels: Informatics, Priority-High
• Removed labels: Priority-Medium

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Original comment by sjaco...@ucr.edu on 7 Jan 2015 at 9:56

• Changed state: FixedInBranch

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Original comment by sjaco...@ucr.edu on 3 Feb 2015 at 9:21

• Changed state: Fixed