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Test
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An object with multiple methods.

| script                | lisp interpreter fixture |
| show  | evaluate text | (load "lisp/object/multiple-methods.lisp") |
| show  | evaluate text | (setq my-counter (counter-class))          |
| check | evaluate text | (funcall my-counter :inc)                  | 1 |
| check | evaluate text | (funcall my-counter :inc)                  | 2 |
| check | evaluate text | (funcall my-counter :inc)                  | 3 |
| check | evaluate text | (funcall my-counter :dec)                  | 2 |
| check | evaluate text | (funcall my-counter :dec)                  | 1 |
| check | evaluate text | (funcall my-counter :dec)                  | 0 |