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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 Pattern matching. However, the match-error-control and match-error-procedure procedures have no impact. A failure to match always signals an error.

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

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