[Issue 23171] New: You can't use std.typecons.Typedef on __vector(*) type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23171

          Issue ID: 23171
           Summary: You can't use std.typecons.Typedef on __vector(*) type
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: leo.labruyere at pm.me

```
import std.typecons : Typedef;
import core.simd : double2;

alias fooBar = Typedef!double2;

void main()
{
        fooBar foo;
}
```

The previous piece of code give the following error :
Error: expression `cast(__vector(double[2]))[nan, nan]` is not a valid template
value argument

Thus, it is not possible to create Typedef on vectorial type (or struct / class
with a vectorial type attribute)

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