import std.stdio;

void receive(void delegate(int n) dg)
{
    static int cnt;
    dg(++cnt);
}

void main()
{
    int loc1=10;
    int loc2=100;
    loc1++;
    receive(
        (int n) { loc2++; writeln("received ", n); }
    );
    writefln("loc: %d %d", loc1, loc2); /* prints 11 101 */
    /* run gdb, breakpoint at line 17
    (gdb) p loc1
    $1 = 11
    (gdb) p loc2
    $1 = 0
    */
}

dmd 2.063+, x86, linux, gdb 7.3, compiled dmd -gc

As you can see, variable loc2, which is incremented inside the function literal, shows wrong value by gdb print.

Quite annoying, I use code like this with std.concurrency and it's impossible to debug (without writef's);