like hash-lambda/match, except makes a mutable-match-lambda-procedure that you can add functionality to with procedures such as mutable-match-lambda-add-clause!. By the way, you can add other types of clauses than hash-lambda/match clauses later.
It is defined like this:
(define-syntax-rule (mutable-hash-lambda/match clause ...) (make-mutable-match-lambda/infer-name (clause->proc #:hash-lambda/match clause) ...))
> (require hash-lambda/mutable-match-lambda) > (examples)
cannot reference undefined identifier
this form is provided so that #:hash-lambda/match can be used as a keyword in clause->proc.
(clause->proc #:hash-lambda/match clause) expands into (clause->proc/hash-lambda/match clause).