The actual problem is likely in an elsif() condition. Those are lumped together at the if() line:
use strict;
use warnings;
my $foo;
my $bar = 1;
if( $bar - 1 ) { # line 7
print $bar;
} elsif( $foo - 1 ) { # throws warning -- at line 7!
print "$foo\n";
my $baz = 2 * $foo;
}
__END__
Use of uninitialized value in subtraction (-) at - line 7.
Use of uninitialized value in concatenation (.) or string at - line 10
+.
Use of uninitialized value in multiplication (*) at - line 11.
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