...overflow on address
0x00016d251750 at pc 0x00010402fce0 bp 0x00016d251680 sp 0x00016d251678
READ of size 8...

...BP's it does go in to the debugger, more or less but with BP...

...Fine
    }{
        const(A)* ap;
        const(B)* bp;
        ap = bp; // Accepted
    }{
        SafeFP safeFp;
        SysFP sysFp;
        sysFp...

...A* ap;
        B* bp;
        ap = bp; // Error: cannot implicitly convert expression `bp` of type
`B...

...SEGV on unknown address 0x000000000000 (pc
0x55f694a96fd9 bp 0x7f791bdfecf0 sp 0x7f791bdfec70 T3)
==28==The signal...

...to do things such as: add more bp, evaluate expressions, change the CPU register values...

...bp _d_throwc
-for ldc -g builds  >bp d_throw_exception

Break @start
-ldc >bp...

...works.
Also Windbg commands worked fine bp Dmain, bp d_throw_exception working (without leading...

...you are right:

```
Derived derived;
Base* bp=&derived;
*bp=base;
derived.method() //ouch
```

I mean...

...referencing meant.

  Derived d = new Derived();
  Base* bp = &d; // fails
  const(Base) cbp = &d; // compiles...