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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/matchable|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == Introduction Matchable is a drop-in compatible replacement for Chicken's MATCH macro. All forms are provided under the same name, and all features except the ..k pattern are supported. In addition, matchable supports non-linear patterns, i.e. patterns where an identifier occurs multiple times, requiring all instances of the identifier to be EQUAL?. For example: (x _ x) matches all lists of three elements whose first and third elements are the same. For full documentation, see [[/man/3/Pattern matching|Pattern matching]]. However, the {{match-error-control}} and {{match-error-procedure}} procedures have no impact. A failure to match always signals an error. == Requirements Any {{syntax-rules}} implementation, such as [[http://code.call-cc.org/legacy-eggs/3/syntax-case.html|syntax-case]], [[syntactic-closures]], [[riaxpander]] or [[alexpander]]. == License public domain == Download http://code.call-cc.org/legacy-eggs/3/matchable.egg == History ; 2.4 : fixing bug where (a ...) matched non-lists ; 2.3 : allowing `...' with any backend, removing redundant check in vector patterns ; 2.2 : uses srfi-46, if available (as it is in alexpander) ; 2.1 : fixing quasiquote patterns ; 2.0 : allowing ellipse patterns in other than the final position of a list ; 1.41 : added syntax-error macro & specialized for Chicken [Kon Lovett] ; 1.3 : updated to change in [[syntactic-closures]] 0.91 ; 1.2 : bugfix, now all tests pass with [[syntactic-closures]] ; 1.1 : works now with [[syntactic-closures]] ; 1.0 : initial release Description of your changes:

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