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  ANSI Common Lisp   1 Introduction   1.5 Conformance

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 may use implementation-dependent features and values, but shall not rely upon any particular interpretation of these features and values other than those that are discovered by the execution of code.

  • 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.  Use of Implementation-Defined Language Features  Character Set for Portable Code

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