[perl #130330] Whatever on the left side of array subscript range may cause hangs (@a[*-2..*]:exists)

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# New Ticket Created by  Aleks-Daniel Jakimenko-Aleksejev 
# Please include the string:  [perl #130330]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=130330 >


To understand the issue, let's take a look at examples that *do* work.

Code:
my @a = <a b c d e>; say @a[2..*]

Result:
(c d e)


Code:
my @a = <a b c d e>; say @a[2..*]:exists

Result:
(True True True)


Code:
my @a = <a b c d e>; say @a[*-2..*]

Result:
(d e)



Alright? Now with “:exists”:

Code:
my @a = <a b c d e>; say @a[*-2..*]:exists

Result:
(hangs forever, *-2..* is being reified)