CLHS: Section 14.1.1.1

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## 14.1.1.1 General Restrictions on Parameters that must be Trees

Except as explicitly stated otherwise, for any standardized function that takes a parameter that is required to be a tree, the consequences are undefined if that tree is circular.

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- DOTTED-LIST-ARGUMENTS:CLARIFY

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