Sometimes I forget that the return does an implicit cast. And it looks inside the slice [..] if it constant or not. Lot of things going on under the hood...This worked for me:```d char[4] fourC(string s) { if(s.length >= 4) return s[0 .. 4]; char[4] res = 0; res[0 .. s.length] = s; return res; } ```
Thank You!
