420 – mixin make dmd break

import std .stdio ;
template MGettor (alias Fld) {
 typeof(Fld) opCall () {
 writefln("getter");
 return Fld;
 }
}
class Foo {
 int a = 1 ,
 b = 2 ;
 mixin MGettor!(a) geta;
 mixin MGettor!(b) getb;
}
void main () {
 auto foo = new Foo;
 writefln(foo.geta);
 writefln(foo.getb);
}
error from dmd:
parse a
semantic a
semantic2 a
semantic3 a
code a
generating code for function 'opCall'
generating code for function 'opCall'
generating code for function 'main'
foo dotexp mixin MGettor!(a);
Internal error: e2ir.c 772

This is the same internal error as bug 354 which also deals with template usage so it might be a dup. The code samples are similar, though definitly not the same.
I reduced the test case a bit:
import std.stdio;
template MGettor () {
 void opCall () {}
}
class Foo {
 mixin MGettor!() geta;
}
void main () {
 Foo foo = new Foo;
 writefln(foo.geta);
}

Fixed DMD 0.170