SRFI-72SRFI 72: Simple hygienic macros.
http://srfi.schemers.org/srfi-72/srfi-72.html
SRFI-72 is implemented in Chicken
define-syntax, let-syntax, letrec-syntax
identifier?, bound-identifier=?, free-identifier=?, literal-identifier=?
syntax, quasisyntax, #', #`
datum->syntax-object, syntax-object->datum, make-capturing-identifier?
begin-for-syntax?, around-syntax?
syntax-error
syntax-case, with-syntax, syntax-rules
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