TypeFunction example: ImplictConvTargets

[foobar]

On Monday, 5 October 2020 at 21:20:36 UTC, Stefan Koch wrote:
> On Monday, 5 October 2020 at 21:13:09 UTC, Paul Backus wrote:
>> On Monday, 5 October 2020 at 20:57:04 UTC, Stefan Koch wrote:
>>> On Monday, 5 October 2020 at 12:50:39 UTC, Andrei 
>>> Alexandrescu wrote:
>>>
>>>> [...]
>>>
>>> This code does not work.
>>> I don't even need to compile it to see that.
>>
>> It has some simple mistakes, but the fundamental idea is 
>> sound. Here's a version that actually compiles:
>>
>> import std.meta;
>>
>> alias Numerics = AliasSeq!(byte, ubyte, short, ushort, int, 
>> uint, long, ulong, float, double, real, char, wchar, dchar);
>> enum convertsTo(T, U) = is(T : U);
>> alias ImplicitConversionTargets(T) = 
>> Filter!(ApplyLeft!(convertsTo, T), Numerics);
>>
>> // prints: (int, uint, long, ulong, float, double, real, dchar)
>> pragma(msg, ImplicitConversionTargets!int);
>> // prints: (float, double, real)
>> pragma(msg, ImplicitConversionTargets!double);
>
> Now post it with all transitive dependencies.
> And we have a fair comparison.

Post your code with all changes to the language and compiler. 
Then we have a fair comparison.