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Source is perlref: (I misremembered slightly)

Anonymous hash and array composers like these can be intermixed freely to produce as complicated a structure as you want. The multidimensional syntax described below works for these too. The values above are literals, but variables and expressions would work just as well, because assignment operators in Perl (even within local() or my()) are executable statements, not compile-time declarations.

In reply to Re^5: Shouldn't references be readonly? by jcb
in thread Shouldn't LITERAL references be readonly? (updated) by LanX

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