Did you try it?

#!/usr/bin/perl

use strict;
use warnings;

use "subs.pl";

foo();
bar();

syntax error at use_subs.pl line 6, near "use "subs.pl""
Execution of use_subs.pl aborted due to compilation errors.

#!/usr/bin/perl

use strict;
use warnings;

use subs.pl;

foo();
bar();

syntax error at use_subs.pl line 6, near "use subs."
Execution of use_subs.pl aborted due to compilation errors.
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