... I expected omitting the redundant quotes to produce "bareword" errors under strict ... but funnily the auto-quoting effect of the fat comma => has higher precedence than the concat operator. (?)

Um ... operator effect precedence? As different from operator precedence? I don't like that phrasing :D

http://perldoc.perl.org/perlop.html#Comma-Operator says

The special quoting behavior ignores precedence, and hence may apply to part of the left operand: 
 print time.shift => "bbb";

[download]
That example prints something like "1314363215shiftbbb" , because the => implicitly quotes the shift immediately on its left, ignoring the fact that time.shift is the entire left operand.

At least this phrasing doesn't bring up precedence, but still seems forced

First part is much better

The => operator (sometimes pronounced "fat comma") is a synonym for the comma except thatit causes a word on its left to be interpreted as a string if it begins with a letter or underscore and is composed only of letters, digits and underscores.

shift is the word on the left, thats the rule, no matter the "entire left operand" , big fat comma quotes the word on the left, the end :)

In reply to Re^2: How to validate %hash = ( 'a' => 'b', ...); by Anonymous Monk
in thread How to validate %hash = ( 'a' => 'b', ...); by RCH

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.