rdmd

[Georg Wrede]

The one at http://www.digitalmars.com/d/2.0/rdmd.html has the following 
code:

int eval(string todo)
{
     auto progname = tmpDir~"/eval.d";
     std.file.write(progname, todo);
     scope(exit) std.file.remove(progname);
     run("dmd -run " ~ progname);
     return 0;
}

I think this is a problem when there are several users.
Probably eval.d could be in a directory with a temporary name.