OFF TOPIC Re: Range of enum type values

Timon Gehr timon.gehr at
Sat Dec 28 21:56:53 UTC 2019

On 28.12.19 22:08, Walter Bright wrote:
> On 12/28/2019 12:22 PM, Johan Engelen wrote:
>> You are saying: the spec says @safe means no UB, and if the spec 
>> doesn't say it then it simply needs updating. There are a number of 
>> text pieces that say that.
>> I am saying: regardless of what the spec and any of those articles 
>> promise, current D behavior is that @safe _can_ have UB in it.
>> I know most people don't like to hear it nor acknowledge it. But I 
>> think it is better to be realistic about this. `@safe` currently does 
>> _not_ mean the code is super safe.
> What it does mean is that all instances of #safe resulting in 
> #undefinedBehavior should be logged either in bugzilla


> or noted as an exception in the #specification.
> ...

Yes, but the only reasonable kinds of exceptions are invalid 
@trusted/@system code or specific compiler flags to disable safety (e.g. 
-boundscheck=off). There can't be any other exceptions.

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