3801 – CTFE: this.arr[i] cannot be evaluated at compile time for structs

A static array contained inside a struct is not accessible during CTFE. Because of this, it seems impossible (since some versions) to define compile-time constants of such structures (for example tuple vectors or matrices).
---
struct S {
 int arr[1];
 this(int x){
 arr[0] = x; // (this.arr[0u]) = x cannot be evaluated at compile time
 }
}
immutable S s_constant = S(1); // Error: cannot evaluate __ctmp1.this(1) at compile time
---

a.b[i]=c; isn't implemented in CTFE yet, but a.b=c; is, so I'm downgrading from blocker. (It's still high priority, though).
Workaround:
struct S {
 int arr[1];
 this(int x){
 int[1] z = x;
 arr = z;
 }
}

Unfortunately, the workaround also errors out with (although I did not check a current svn build):
test.d(6): Error: this.arr[] = cast(const(int[]))x cannot be evaluated at compile time
But this gave me finally another idea, which seems to work:
struct test {
 int[1] f;
 this(int x){
 int[] dst = f;
 dst[0] = x;
 }
}
[Now off to some code porting and finally trying out the recent features... ;-)]

Unfortunately, the workaround also does not work (compiles but generates incorrect code): http://d.puremagic.com/issues/show_bug.cgi?id=3984.

Yeah, there doesn't seem to be any workaround. Changing it back to blocker.

Fixed.
D1:
https://github.com/D-Programming-Language/dmd/commit/ef2a0f1da10331c4de102ca3e029ea1c1c1a46bf
D2:
https://github.com/D-Programming-Language/dmd/commit/0219a5f0dcc88076759a4c472582954d0fb804b0