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Scan the syntax object clauses expecting it to represent a list of clauses; return a new syntax object representing clauses fully unwrapped. The function synner is invoked if the structure of clauses is invalid.
Given a fully unwrapped syntax object unwrapped-clauses holding a
list of clauses (for example the return value of
syntax-clauses-unwrap) select the ones having ?identifier
being free-identifier=? to an identifier in the list
keywords and return the selected clauses in a fully unwrapped
syntax object holding the list of them; return null if no matching
clause is found.
Given a fully unwrapped syntax object unwrapped-clauses holding a
list of clauses (for example the return value of
syntax-clauses-unwrap) remove the ones having ?identifier
being free-identifier=? to an identifier in the list
keywords and return the selected clauses in a fully unwrapped
syntax object holding the list of them; return null if no matching
clause is found.
Given a fully unwrapped syntax object unwrapped-clauses holding a
list of clauses (for example the return value of
syntax-clauses-unwrap) partition it into: a list of clauses
having ?identifier being free-identifier=? to an identifier
in the list keywords, a list of non–matching clauses. Return the
two lists.
This function can be used to check that a list of clauses only contains clauses with selected identifiers.
Given a fully unwrapped syntax object holding a list of clauses (for
example the return value of syntax-clauses-unwrap): collapse the
clauses having equal ?identifier into a single clause and return
the resulting unwrapped syntax object. Example:
(syntax-clauses-collapse ((#'fields #'a #'b #'c)
(#'fields #'d #'e #'f)))
⇒ ((#'fields #'a #'b #'c #'d #'e #'f))
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