(guile.info.gz) General Rules

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 18.2.1 General Rules
 --------------------
 
 Any code which operates on Guile datatypes must `#include' the header
 file `<libguile.h>'.  This file contains a definition for the `SCM'
 typedef (Guile's universal type, as in the examples above), and
 definitions and declarations for a host of macros and functions that
 operate on `SCM' values.
 
    All identifiers declared by `<libguile.h>' begin with `scm_' or
 `SCM_'.
 
    The functions described here generally check the types of their
 `SCM' arguments, and signal an error if their arguments are of an
 inappropriate type.  Macros generally do not, unless that is their
 specified purpose.  You must verify their argument types beforehand, as
 necessary.
 
    Macros and functions that return a boolean value have names ending in
 `P' or `_p' (for "predicate").  Those that return a negated boolean
 value have names starting with `SCM_N'.  For example, `SCM_IMP (X)' is
 a predicate which returns non-zero iff X is an immediate value (an
 `IM').  `SCM_NCONSP (X)' is a predicate which returns non-zero iff X is
 _not_ a pair object (a `CONS').
 

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(guile.info.gz) How Guile does it

(guile.info.gz) Conservative GC