std.experimental.testing formal review

[Atila Neves via Digitalmars-d]

On Tuesday, 29 September 2015 at 19:15:13 UTC, Meta wrote:
> On Tuesday, 29 September 2015 at 14:34:42 UTC, Atila Neves 
> wrote:
>> runTests with no optional arguments will run the tests in 
>> threads.
>> There's nothing about purity enforcement there. In fact, I 
>> tried
>> using pure unit tests yesterday with std.experimental.testing
>> and couldn't. The compiler inferred the functions to not be 
>> pure.
>> I tried adding pure to them and descended into a madness of 
>> adding pure all over phobos until I got fed up. It seems to be 
>> something to do with `format` not being pure, I have no idea 
>> why. It really should be.
>
> There are various unit tests in Phobos that are annotated with 
> @pure, @nogc, nothrow, etc. to test that those attributes will 
> be inferred by the compiler. In light of that, this could pose 
> a problem.

Which is why I tested with a pure unittest. The problem is that 
`text` and `to` from `std.conv` aren't pure. That can and should 
be fixed, but unless I write my own pure versions, it's got 
nothing to do with this proposal.

Atila