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10 lines
500 B
10 lines
500 B
2 years ago
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Exercise 4.13: Scheme allows us to create new
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bindings for variables by means of define, but provides no way to get
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rid of bindings. Implement for the evaluator a special form
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make-unbound! that removes the binding of a given symbol from the
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environment in which the make-unbound! expression is evaluated. This
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problem is not completely specified. For example, should we remove only the
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binding in the first frame of the environment? Complete the specification and
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justify any choices you make.
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