higher-order macros [Re: Python syntax in Lisp and Scheme

[james anderson]

"oleg at pobox.com" wrote:
> 
> Macros generating macros and macros that take other macros as
> arguments are quite common in Scheme
> ...
> 
> Syntax-rule-level ??!lambda and ??!apply:
> http://pobox.com/~oleg/ftp/Scheme/macros.html
> 

interesting, but to contrast that with the referenced meta implementation, the
form of the macro argument matters:

  hof                         hom
  apply op form               macro-expand (cons op form) or form
                              (either immediately or relegated to the compiler)

  fixed-point functions       fixed-point forms


are there examples where these little beasties are used in production?

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