(guile.info.gz) Procedures
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18.2.5.3 Procedures
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Guile provides two kinds of procedures: "closures", which are the
result of evaluating a `lambda' expression, and "subrs", which are C
functions packaged up as Scheme objects, to make them available to
Scheme programmers.
(There are actually other sorts of procedures: compiled closures, and
continuations; see the source code for details about them.)
-- Function: SCM scm_procedure_p (SCM X)
Return `SCM_BOOL_T' iff X is a Scheme procedure object, of any
sort. Otherwise, return `SCM_BOOL_F'.
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