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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <151115100814.ZM29061@torch.brasslantern.com>
Date: Sun, 15 Nov 2015 10:08:14 -0800
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To: zsh-workers@zsh.org
Subject: Another interesting (P) effect
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This isn't new, but given that ${(P)${(f)lines} is an example in the
"Rules" (rule 23), seems worth mentioning:

torch% a=AYY
torch% abc=AYYBEESEE
torch% lines=$'a\nb\nc'
torch% print ${(P)${(f)lines}} 
AYY

So (P) parses off the first thing that looks like a parameter name and
discards everything else, with no error.

torch% IFS='' eval 'print ${(P)${(f)lines}}'
AYYBEESEE