Bug 23171 – You can't use std.typecons.Typedef on __vector(*) type

``` 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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