The problem with M\ is that it has an arity of 1 where we need it to have arity 2. Also, for multimethods, the \ disables parsing of the array that follows, e.g. ``M\ { string string } multimethod-name`` parses as ``M\ {`` and leaves the rest unparsed. This is obviously wrong.
An alternative syntax that should be implement and looks ok is ``m{ array generic }``
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