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8.133 strict

Pragma for doing strict error checking within the current block. Can be turned off by prefixing with no :

use strict 'vars'; 
no strict 'vars';
Provides three kinds of restriction:
strict 'refs'

Generates runtime error if you use any symbolic references.

strict 'subs'

Generates compile-time error if you use a bareword identifier that's not a predeclared subroutine.

strict 'vars'

Generates compile-time error if you access a variable that wasn't declared via my , isn't fully qualified, or wasn't imported.

use strict by itself (with no import list) is the most restrictive, causing all possible restrictions to be imposed.