Scheme - let has to respect lexical scope as well

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let has to respect lexical scope as well

Andreas

2006-09-26, 4:09 am

> However, when evaluating a let expression, the environment does
> not have to be remembered in this way. The body of the let expression is
> evaluated in the environment of the let expression.

that body can in turn reference variables in the lexical scope of the
let however, so the
let _does_ have to remember its lexical environment just like a lambda,
i.e.

(let ((x 5))
...
(let ((y 10))
(+ x y)))

if the inner let did not remember its environment, how would it resolve
the free reference to "x" in its body?

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