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(slib.info)R4RS Macros

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R4RS Macros
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  `(require 'macro)' is the appropriate call if you want R4RS
high-level macros but don't care about the low level implementation.  If
an SLIB R4RS macro implementation is already loaded it will be used.
Otherwise, one of the R4RS macros implemetations is loaded.

  The SLIB R4RS macro implementations support the following uniform
interface:

 - Function: macro:expand sexpression
     Takes an R4RS expression, macro-expands it, and returns the result
     of the macro expansion.

 - Function: macro:eval sexpression
     Takes an R4RS expression, macro-expands it, evals the result of the
     macro expansion, and returns the result of the evaluation.

 - Procedure: macro:load filename
     FILENAME should be a string.  If filename names an existing file,
     the `macro:load' procedure reads Scheme source code expressions and
     definitions from the file and evaluates them sequentially.  These
     source code expressions and definitions may contain macro
     definitions.  The `macro:load' procedure does not affect the
     values returned by `current-input-port' and `current-output-port'.