Interpreter #79
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Interpreter #79
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yurii-litvinov
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Oct 29, 2020
yurii-litvinov
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yurii-litvinov
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В целом всё правильно, зачтена
| | Application (left, right) -> isFree left variable || isFree right variable | ||
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| /// Замена переменной в выражении | ||
| let rec substitution oldVariable newVariable expression = |
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newVariable --- не лучшее название для подставляемого вместо переменной терма. Может показаться, что он может быть только переменной
| |> betaReduction | ||
| |> should equal (Application(Variable('x'), Variable('y'))) | ||
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| // (λx.x y) |
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Вообще, выражение за лямбдой --- это термы справа до скобки, так что тут имелось в виду (λx.x) y. В тестах ниже тоже. Это запутывает
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