When staring at it doesn't help,

... you look out for other tools. What I found very helpful is to place the cursor over an identifier (really any identifier where I expect trouble) and press the * or # key.

That's the vim command to search for the current identifier as a word, and since I have the option hlsearch enabled, I automatically see all occurrences of this identifier on the current page, and usually I notice if one is missing.

That's very handy for example to spot typos in package names or hash keys, both of which aren't checked to the same amount at compile time as variables are (assuming you use strict).

In reply to Re^2: boolean chaining - && and 'and' by moritz
in thread boolean chaining - && and 'and' by metaperl

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.