RE: Positional predicates in pattern matching

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Subject: RE: Positional predicates in pattern matching
From: "Michael Kay" <mhk@xxxxxxxxx>
Date: Fri, 2 Jul 2004 21:00:04 +0100

> b[something][2] - match the 'b' which is the second sibling 
> 'b' if 'something' 
> evaluates to true. 

No, it is 'match the second sibling b for which "something" is true'. In
your case, something is always true, so it means "match the second sibling
b".

1. Take all the b's
2. remove those for which predicate 1 is false
3. take the 2nd of those that remain

Michael Kay

Current Thread
Re: Positional predicates in pattern matching, (continued) Kevin Jones - Fri, 2 Jul 2004 17:12:43 +0100 David Carlisle - Fri, 2 Jul 2004 17:18:41 +0100 Kevin Jones - Fri, 2 Jul 2004 18:24:48 +0100 Josh Canfield - Fri, 2 Jul 2004 12:10:55 -0700 Michael Kay - Fri, 2 Jul 2004 21:00:04 +0100 <= Michael Kay - Fri, 2 Jul 2004 17:46:45 +0100 Michael Kay - Fri, 2 Jul 2004 17:03:46 +0100

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