catch common errors by beginners

[szabgab]

For example

  $x = //

  if ($x = //) {
  }

Lack of use strict, should be also considered a beginners type error.

Lack of use warnings - I would consider it such but other don't.
but then you won't get alerted with such cases:

   if ($x = 42) {
   }

[szabgab]

See also ​http://www.perlmonks.org/?node_id=728569

[szabgab]

a usual typo:

use warning;

(in singular)

[szabgab]

Though not what I thought of this node deserves special treatment: ​http://www.perlmonks.org/?node_id=728683

Here is the content from that post:

• forget "#" for a comment, unfortunately at the same line as i try to use a new function
• searching the syntax error missing ";" at the end of the line.
• missing closing "}"
• Defining variables like $count and try to use variable $cont some lines down (and searching the typo for minutes

[azawawi]

My goals is quick fix these using Padre's shiny new Perl 5 Quick Fixes.

[azawawi]

and this link is useful also:
​http://www.perlmonks.org/?node_id=733201

[Sewi]

Most items done in r7818

[daxim]

#ifa=4 generates the incorrect warning about assignment within if. Reported by Coke on IRC.