dynamically scoped

dynamically scoped

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If the preceding example were tried in a dynamically scoped Lisp, the parent contour of CHILD would be the one created by PARENT, and the result of the evaluation would be different, as shown in Figure 7.
In modern Lisps, variables are lexically scoped by default, but it is still possible to have a kind of dynamically scoped variable called a special variable.
The evaluation rule for dynamically scoped variables is that we search all the enclosing contours in the order they appear on the call stack, ignoring the contours' pointers to their normal (lexical) parents.

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