Exception chaining and collectException

Steven Schveighoffer via Digitalmars-d digitalmars-d at puremagic.com
Fri Aug 18 05:07:26 PDT 2017

On Friday, 18 August 2017 at 03:31:38 UTC, Walter Bright wrote:
> Chained exceptions are a good idea, but are more or less a 
> disaster:
> 1. No other language does chained exceptions
> 2. Attempting to hammer D chained exceptions into other 
> language schemes (such as C++) makes for lots of unfun hours 
> attempting to decode undocumented behavior in those other 
> schemes
> 3. Makes D exceptions incompatible with other language 
> exceptions and their infrastructure
> 4. Are incomprehensibly implemented (I defy anyone to explain 
> how the test cases in the test suite are actually supposed to 
> work)
> 5. Are more or less incompatible with non-GC memory allocation
> I'd like to remove them from D.
> I recommend *not* designing any program that requires them.

If we are to remove them, what happens when exceptions would 
normally chain?


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