DMD diagnostic - any way to remove identical lines from final dmd error log?

[Don Clugston]

On 14/08/12 08:59, Don Clugston wrote:
> On 13/08/12 18:47, Dmitry Olshansky wrote:
>> I seriously consider writing a simple postprocessor for dmd's output.
>> Once dmd became able to recover from errors and crawl on it started to
>> produce horrific amounts of redundant text on failure.
>>
>> Observe for instance that there are only 6 + 2 = 8 lines of interest:
>
> Spurious or repeated error messages should be considered to be bugs.
> Please put test cases in Bugzilla. A long time ago, the compiler used to
> spew reams of garbage all the time. Now it rarely happens.
>
>> Other food for thought is to try to indicate explicitly which errors
>> are related vs unrelated, which are collateral, like failed template
>> instantiation that rolls out the whole path of failure (but one have to
>> read the text carefully to get where it starts).
>
> That's already happening. Supplemental messages don't have the word
> 'Error' at the start of the error message.

One fairly easy way to solve this, would be that once a template 
*instantiation* has failed, the template *definition* would be marked as 
doubtful, and any further instantiation using that definition would have 
all error messages suppressed. If an error occurred, a single error 
would be produced stating that the template instantiation failed.

The downside would be that if the template instantiation failed for a 
completely different reason the second time, its root cause error would 
not be shown. But this latest release is the only time such errors have 
been shown anyway.