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Some functions do not define what they return in list or scalar context. For instance, according to the {[perlfunc}} manpage, the sort() function "sorts the LIST and returns the sorted list value. In scalar context, the behavior of 'sort()' is undefined."

Noncompliant Code Example (sort())

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sub ret {
  my $list = shift;
  my @list = @{$list};
  # ...
  return sort @list;
}

my @list = ( "foo", "bar", "baz");
my $result = ret @list;

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sub ret {
  my $list = shift;
  my @list = @{$list};
  # ...
  return sort @list;
}

my @list = ( "foo", "bar", "baz");
my @result = ret @list;

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Automated Detection

Bibliography

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[Conway

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2005]
[Manpages]	perlfunc

 

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Image Added Image Added Image Added|AA. Bibliography#Conway 2005]\] \[[Manpages|AA. Bibliography#Manpages]\] [perlfunc|http://perldoc.perl.org/perlfunc.html]EXP11-C. Do not apply operators expecting one type to data of an incompatible type      03. Expressions (EXP)      EXP13-C. Treat relational and equality operators as if they were nonassociative