@node Guile
@chapter Guile

@c TODO
This chapter will probably in the future be replaced by a proper
system overview in the future.

@c module (vcomponent control)

@defmac with-replaced-properties (component (key value) ...) body ...
Through the extent of @var{body} each @var{key}'s value in
@var{component} is replaced by its repspective @var{value}.

Note that @var{body} is guarded through a dynamic-wind, meaning that
even non-local exits will restore @var{component} to its initial
state.
@end defmac