import core.simd: double2;
struct Foo {
    double2 ab = [0.0, 0.0];
}
Foo f = Foo();
void main() {}


DMD 2.064alpha gives:

Assertion failure: '0' on line 660 in file 'init.c'


This gives the same error:


import core.simd: double2;
struct Foo {
    double2 ab = [0.0, 0.0];
}
void foo(Foo f=Foo()) {}
void main() {}


This rejects-valid affects the usage of SIMD registers in my code. See also Issue 10450