Does anybody can explain why "require BB;" in 1.pl don't work in this case:

--------------------------------- file 1.pl 
#!/usr/bin/env perl

use 5.18.2;

$SIG{__WARN__} = sub {
    say qq{WARN: $_[0]};
    require BB;
};

require AA;

1;
__END__

[download]
--------------------------------- file AA.pm 
package AA;

use warnings;

a b

sub aa {
    my $self = shift;
    
    return $self;
}

1;
__END__

[download]
--------------------------------- file BB.pm 
package BB;

print qq{BB required\n};

1;
__END__

[download]
If I change "a b" in AA.pm to something else, which also generates warning (for example "a b c") - everything works as expected - BB.pm successfully required from $SIG{__WARN__} in 1.pl.

In reply to Unexpected compiler behavior by zdm

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