What does the following program do?

[Shachar Shemesh via Digitalmars-d]

import std.algorithm: move;
import std.stdio;
import std.string;
class A {
    int val;

    override string toString() const {
        return "A(%s)".format(val);
    }
}

struct B {
    int val;
}

void main() {
    B b = B(12);
    B* bp = &b;
    B* bp2;

    writefln("bp=%s bp2=%s", bp, bp2);
    move( bp, bp2 );
    writefln("bp=%s bp2=%s", bp, bp2);

    A a1 = new A();
    a1.val = 42;
    A a2;

    writefln("a1=%s (%s) a2=%s (%s)", a1, cast(void*)a1, a2, 
cast(void*)a2);
    move( a1, a2 );
    writefln("a1=%s (%s) a2=%s (%s)", a1, cast(void*)a1, a2, 
cast(void*)a2);

    B b2;
    writefln("b=%s b2=%s", b, b2);
    move( b, b2 );
    writefln("b=%s b2=%s", b, b2);
}

Answer:
bp=7FFFAB559970 bp2=null
bp=7FFFAB559970 bp2=7FFFAB559970
a1=A(42) (7FD1B79E9000) a2=null (null)
a1=A(42) (7FD1B79E9000) a2=A(42) (7FD1B79E9000)
b=B(12) b2=B(0)
b=B(12) b2=B(12)

"move" was supposed to initialize "source" to init. This does not appear 
to be the case. Is that a bug? Where?