I made the following mistake: 

use strict;
use warnings FATAL => qw(all);
...
my @remove_env=qw(FOO BAR BAZ);
foreach my $var (@remove_env) {
  $ENV{$var}='something';
}
...
delete $ENV{_} foreach (@remove_env);
print "$ENV{FOO}\n"; # FOO stil in environment!!!

[download]
Of course the error is in the delete line, but I wonder why this mistake was not detected by Perl. In this case, _ would be seen as file handle, but this would mean that using a file handle as a hash key would be a legal usage and not even issue a warning! Any comments?

-- 
Ronald Fischer <ynnor@mm.st>

In reply to Why did this error slip through? by rovf

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