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sub scanl(&@) {
    my ($f, @rv) = @_;
...
my @rv = scanl \&divide, 64, 4,2,4;
   -or-
my @rv = scanl { $_[0] / $_[1] } 64, 4,2,4;

my $pkg = caller();
my $ap = do { no strict 'refs'; \*{$pkg.'::a'} };  local *$ap;
my $bp = do { no strict 'refs'; \*{$pkg.'::b'} };  local *$bp;