status: final (2017-03-07)
keywords: Syntax
Each syntax definition assigns a macro
transformer to a keyword. The macro transformer is specified by a
transformer spec, which is either an instance of
syntax-rules, an existing syntactic keyword (including macro
keywords and the syntactic keywords that introduce the core forms, like
lambda, if, or define), or a use
of a macro that eventually expands into an instance of
syntax-rules. In the latter case, the keyword of macro use
is called a custom macro transformer.