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| ANSI Common Lisp 3 Evaluation and Compilation 3.8 Dictionary Evaluation and Compilation
3.8.19 ignore, ignorable | Declaration
Syntax: `(ignore `{`var | (function fn)`}`*)` `(ignorable `{`var | (function fn)`}`*)` Arguments: var - a variable name. fn - a function name. Valid Context: declaration Binding Types Affected: variable, function Description: The ignore and ignorable declarations refer to for-value references to variable bindings for the vars and to function bindings for the fns. An ignore declaration specifies that for-value references to the indicated bindings will not occur within the scope of the declaration. Within the scope of such a declaration, it is desirable for a compiler to issue a warning about the presence of either a for-value reference to any var or fn, or a special declaration for any var. An ignorable declaration specifies that for-value references to the indicated bindings might or might not occur within the scope of the declaration. Within the scope of such a declaration, it is not desirable for a compiler to issue a warning about the presence or absence of either a for-value reference to any var or fn, or a special declaration for any var. When not within the scope of a ignore or ignorable declaration, it is desirable for a compiler to issue a warning about any var for which there is neither a for-value reference nor a special declaration, or about any fn for which there is no for-value reference. Any warning about a "used" or "unused" binding must be of type style-warning, and may not affect program semantics. The stream variables established by with-open-file, with-open-stream, with-input-from-string, and with-output-to-string, and all iteration variables are, by definition, always "used". Using `(declare (ignore v))`, for such a variable v has unspecified consequences. See Also: declare Allegro CL Implementation Details: None.

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