dChar Error

[Salih Dincer]

Hi All,

What is causing the error in the code snippet below?

```d
void replaceRight(S)(ref S[] str, S[] slc)
{
   size_t len1 = slc.length,
          len2 = str[len1..$].length;
   assert(len1 == len2);
   str[len1..$] = slc;
}

import std.stdio;

void main()
{
   // example one:
   char[] str1 = "cur:€_".dup;
   str1.length.write(": "); // 8:
   str1[4..$].writefln!"[%s]"; // [€_]
     
   str1.replaceRight("$  _".dup);
   str1.writefln!"[%s]"; // [cur:$  _]

   // example two:
   dchar[] str2 = cast(dchar[])"cur:€_"d;
   str2.length.write(": "); // 6:
   str2[4..$].writefln!"[%s]"; // [€_]
   
   str2.replaceRight(cast(dchar[])"$ _"d);
   str2.writefln!"[%s]"; // Error--^
} /* Prints:
   8: [€_]
   [cur:$  _]
   6: [€_]
   Error: program killed by signal 11
*/
```
Why does replaceRight() work fine with a char array, but not a 
dchar array?  Whereas, rvalue and lvalue lengths are equal to 
each other!

SDB at 79