https://issues.dlang.org/show_bug.cgi?id=12420
--- Comment #5 from Kenji Hara <[email protected]> --- (Sorry, ignore my comment #4.) (In reply to Denis Shelomovskij from comment #3) > Looks like you misunderstood me. The word `immutable` shouldn't be here, > it's just an incorrect error message. Currently we have no rules disallowing > non-`immutable` associative array keys. I filed Issue 12491 for this. > > This issue will be auto-fixed if Issue 2954 will be fixed by applying a > correct check to ensure key expression can be implicitly converted to AA key > type in case of setting AA value. In D, AA requires immutability for the key. In evidence all AA key types are implicitly qualified with const. int[char[]] aa; pragma(msg, typeof(aa)); // Prints: int[const(char)[]] Honesty, key type should be qualified with immutable. Currently int[const(char[])] can accept char[] key when storing value in the AA, but it's a known issue. Anyway in D AA types cannot have mutable key. Therefore this issue should be marked as invalid. --
