SIGSEGV (Segmentation Fault) upon setting character in char array (object member var)

[John Kiro]

Hello there,

First time to experiment with DLang, after a long time.

I'm getting a weird behavior with an **array of chars**, where I 
get a segmentation fault upon writing to it (see code and output 
below). What makes this problem weird it two things:

1) Why there is no problem with the **int** array (unlike the 
**char** array)?
2) Why reading the array element (**charArray[index]**) works, 
unlike writing to it?

The problem is gone if I uncomment the constructor code.

Code:

      import std.stdio;

      void main()
      {
        (new Test).runit();
      }

      class Test {
        static enum MAX = 10;
        uint index = 0;
        auto intArray = new int[MAX];
        auto charArray = new char[MAX];

        this() {
          /*
          charArray = new char[MAX];
          */
        }

        void runit() {
          debug writefln("IntArray initially: %s", intArray);
          intArray[index] = 40; //OK
          debug writefln("IntArray becomes: %s", intArray);

          debug writefln("Adding char in place of (%c) at index 
(%d)..",
                         charArray[index], index);
          charArray[index] = 'a'; //ERROR: segmentation fault 
(code -11)!
          debug writefln("CharArray becomes %s (PROGRAM ABORTS 
BEFORE IT ACTUALLY!)",
                        charArray);
        }
      }


Output:

      $ dub run
          Starting Performing "debug" build using 
/home/john/dlang/dmd-2.106.0/linux/bin64/dmd for x86_64.
          Building hello-dlang ~master: building configuration 
[application]
           Linking hello-dlang
           Running hello-dlang
      IntArray initially: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
      IntArray becomes: [40, 0, 0, 0, 0, 0, 0, 0, 0, 0]
      Adding char in place of (�) at index (0)..
      Error Program exited with code -11