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Logtalk - Object oriented extension to Prolog
Release 2.21.6

Copyright (c) 1998-2004 Paulo Moura.  All Rights Reserved.
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% start by loading the example:

| ?- logtalk_load(loader).
...


% first variant of the "diamond problem", defined in the "diamond1" metafile:

| ?- d1::m.

Redefinition of method m/0 in object b1
yes


% second variant of the "diamond problem", defined in the "diamond2" metafile:

| ?- d2::m.

Redefinition of method m/0 in object c2
yes


% third variant of the "diamond problem", defined in the "diamond3" metafile:

| ?- d3::b3_m.

Redefinition of method m/0 in object b3
yes

| ?- d3::c3_m.

Redefinition of method m/0 in object c3
yes

| ?- d3::m.
Redefinition of method m/0 in object b3
yes