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Perl 4 used ' as a package name separator when importing packages. Perl 5 provides the same feature but uses :: to separate package names. Use colons rather than single quotation marks to separate packages.

Noncompliant Code Example

This noncompliant code example uses the Perl 4 ' syntax to import an external package. This code does successfully require the package, but because Perl 5 is over 15 years old, the Perl 4 syntax has largely been forgotten. Consequently, the code can be seen as confusing or arcane.

require DBI'SQL'Nano;

Compliant Solution

This compliant solution uses Perl 5's :: syntax to import an external package:

require DBI::SQL::Nano;

Risk Assessment

Recommendation

Severity

Likelihood

Remediation Cost

Priority

Level

DCL05-PL

Low

Improbable

Low

P6

L2

Automated Detection

Tool

Diagnostic

Perl::Critic

Variables::ProhibitPerl4PackageNames

Bibliography

 

 


2 Comments

  1. The intro to this page seems to be unrelated; also the headings for the code examples are wrong. (They mention Universal::can, which is properly spelled UNIVERSAL::can, but the code examples are not related to UNIVERSAL::can).

    Edit: It looks like the intro and headings here are for DCL30-PL.

    1. Yes they were. Sorry about that; it's been fixed.