[vector] #28: Add safe indexing function

[vector]

#28: Add safe indexing function
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Reporter:  anonymous    |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  major        |    Milestone:     
 Version:               |   Resolution:     
Keywords:               |  
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Comment (by anonymous):

 I have a patch which implement this function but trac refuses to add
 attachments. (See #29)

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Ticket URL: <http://trac.haskell.org/vector/ticket/28#comment:1>
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