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Pattern parser top wraps cons-pat with 'as ident' -> (:pas PAT NAME). Match clause parser consumes optional 'when GUARD-EXPR' before -> and emits (:case-when PAT GUARD BODY) instead of :case. Eval: :pas matches inner pattern then binds the alias name; case-when checks the guard after a successful match and falls through to the next clause if the guard is false. Or-patterns deferred — ambiguous with clause separator without parens-only support.