If your function call other function that should not be called in void context, try to locally redefine it.

sub Foo::bar { return 42; }
say '1: ', Foo::bar;

{
    no warnings 'redefine';
    local *Foo::bar = sub { die };

    eval { say '2: ', Foo::bar; };
}

say '3: ', Foo::bar;

__END__

1: 42
3: 42
[download]