Internal error mixing templates and CTFE

[David Bennett via Digitalmars-d-learn]

Hi Guys,

I've been playing around with CTFE today to see how far I would 
push it but I'm having an issue appending to an array on a struct 
in CTFE from a template:

```
struct Content{
    string[] parts;
}

void add_part_to_content(Content content, string s)(){
    content.parts ~= "Part: "~s;
}

void main(){
    enum Content content = {};
    add_part_to_content!(content, "Header")();
}
```

This generates the following output:

& el:0x24052a0 cnt=0 cs=0 &  TY* 0x2403100
 el:0x2403100 cnt=0 cs=0 const  TYucent 0LL+0LL
Internal error: ddmd/backend/cgcs.c 352

FYI: I also get the same error with the template 
add_part_to_content(alias Content content, alias s) syntax.

So two questions:

Should what I'm doing be possible?

Is this an error in dmd, and should I open a bug report?