Non-techincal brain, is @safe by default good or not?

[Andrei Alexandrescu]

On 5/28/20 6:28 AM, Mathias LANG wrote:
> 
> import std.algorithm.mutation;
> struct S
> {
>      void opPostMove(const ref S old) @system nothrow pure
>      {
>          int* ptr = cast(int*)42;
>          *ptr = 42;
>      }
>      int a;
> }
> void main () @safe nothrow
> {
>      S s1;
>      s1.a = 41;
>      S s2 = move(s1); // BOOM
>      assert(s2.a == 42);
> }
> ```
> 
> This compiles and crash just fine.

At least this is a legit bug report.