dmd 2.012

import std.stdio;
alias writefln p;

struct S
{
    int id;
    this(this)
    {
        p("this(this):", id);
    }
    ~this()
    {
        p("~this():", id);
    }
}

void main()
{
    S b;
    b.id = 10;
    {
        p(1);
        S a;
        a.id = 1;
    }
    {
        p(2);
        S a = b;
        a.id = 2;
    }
    {
        p(3);
        S a;
        a.id = 3;
        a = b;
    }
    {
        p(4);
        S* a = new S;
        a.id = 4;
        *a = b;
        delete a;
    }
    {
        p(5);
        scope S* a = new S;
    }
    p(6);
}
/+
1
~this():1
2
this(this):10
~this():2
3
this(this):10
~this():3
~this():10
4
this(this):10
~this():4
~this():10
5
6
~this():10
+/

んー？ b のデストラクタってこんなに呼ばれていいんかいな．
p(5)は思いつきでやってみたおまけ．