On Thu, Jun 25, 2009 at 7:03 AM, James Reeves<weavejes...@googlemail.com> wrote:
>
> On Jun 25, 10:02 am, James Reeves <weavejes...@googlemail.com> wrote:
>> Here's one that regularly confuses me:
>>
>>   (prn [10)
>>
>>   => java.lang.Exception: Unmatched delimiter: )
>>
>> Ideally the exception should correctly report the type of unmatched
>> bracket. In this case:
>>
>>   => java.lang.Exception: Unmatched delimiter: ]
>
> I've just realised I've made a mistake. The error message is not
> complaining that there is a parenthesis missing; it is complaining
> that an ending parenthesis has no matching start parenthesis.
>
> So this is an technically accurate error message, but perhaps not the
> most intuitive, as a user is more likely to miss off an ending bracket
> than a starting one. A better error message might be:
>
>  => java.lang.Exception: Missing delimiter: ]
>

But it doesn't know when it sees the ) that ] is missing, it might not be:

(prn [10)]

i.e. the ) has nothing to do with the [, there might not even be a
pending aggregate:

user=> )
java.lang.Exception: Unmatched delimiter: )

Rich

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