It’s been a while but not specifically no. I may go diving through perldeltas because I’m curious myself.

Edit: So . . .

• perl5280delta notes the changes to the while documentation to its current state (commit 5e979393c70, issue).
• perl518delta notes that while(each %h) was changed to imply while(defined($_ = each %h)) using the phrasing "like readline and readdir" so it's present before then.
• The oldest possibly related change I've found was commit 54310121b44 which rolls up patches 5.003_86..5.003_95 where it changes perlsyn where the explicit version of the while loop given in the "Loop Control" section has a defined($line = <ARGV>) conditional, so I'm guessing it's possibly a 5.004-ism . . .
• stopping poking for now . . .

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