I was thinking about this a little over the weekend, and I realized why SUPER needs to check the current package's @ISA, instead of the package into which the object is blessed. It's to handle the case where the super-method also uses SUPER. If it just used the @ISA of the package the object was blessed into, SUPER in a super-method would start over at the bottom (top?) of the inheritance tree. So it has to use the current package, which is also the current position in the inheritance tree, except for the one case that you happened to run into. Anyway, that's the "why" of it.

I also realised that it's probably a bit more efficient to do the eval once, when creating the anonymous sub, instead of every time it's called (although it may be a case of premature optimization... I'm not entirely certain). Like so: 

$methods{$_} = eval qq(
  package $caller;
  sub {
    my \$self = shift;
    #
    #print "installing $method_name() in $caller...\n";
    #
    # Without \$caller and eval, the following line causes this error:
    # 
    # Can't locate auto/CustomMethodMaker/SUPER/[METHOD].al in \@INC
    #
    my \@parent_slots;
    if ( \$self->can( SUPER::$method_name ) ) {
      \@parent_slots = \$self->SUPER::$method_name( \@_ );
    }
    return ( \@parent_slots, \@slots );
  }
);
die $@ if $@;

[download]

Just thought I'd share those, for completeness.

bbfu
Black flowers blossom
Fearless on my breath

In reply to Re9: Calling SUPER in MethodMaker-generated methods by bbfu
in thread Calling SUPER in MethodMaker-generated methods by danb

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