fspec-third

Arguments: fspec

Function specs in Allegro CL have internal and external representations. The external representation is a list but the internal representation is more complicated. This function returns the third element of the function spec argument if there is one (returns nil if there is not) regardless of whether the representation is internal or external.

See implementation.htm, particularly section Function specs and also fspec-first, and fspec-second.

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Created 2019.8.20.