Conforming Programs (ANSI and GNU Common Lisp Document)

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#### 1.5.2 Conforming Programs

Code conforming with the requirements of this standard shall adhere to the following:

1.

  Conforming code shall use only those features of the language syntax and semantics that are either specified in this standard or defined using the extension mechanisms specified in the standard.

2.

  Conforming code shall not rely on any particular interpretation of implementation-dependent features.

3.

  Conforming code shall not depend on the consequences of undefined or unspecified situations.

4.

  Conforming code does not use any constructions that are prohibited by the standard.

5.

  Conforming code does not depend on extensions included in an implementation.