$ perl -e 'open $fh, "<", "not_a_file" or die $!'
No such file or directory at -e line 1.

##</code><code>##

$ perl -e 'use autodie; open $fh, "<", "not_a_file"'
Can't open 'not_a_file' for reading: 'No such file or directory' at -e line 1

##</code><code>##

open my $fh, $mode, $filename;