This was working under 2.065:
```
import std.container;
void main()
{
DList!int list;
list.clear();
}
```
Run-time assertion:
```
core.exception.AssertError@/usr/include/dmd/phobos/std/container/dlist.d(480):
Cannot remove from an un-initialized List
----------------
/home/ncrashed/dev/d/dmd-test/dmd-test(pure nothrow @nogc @safe
std.container.dlist.DList!(int).DList.Range
std.container.dlist.DList!(int).DList.remove(std.container.dlist.DList!(int).DList.Range)+0x90)
[0x441830]
/home/ncrashed/dev/d/dmd-test/dmd-test(pure nothrow @nogc @safe
void std.container.dlist.DList!(int).DList.clear()+0x65)
[0x4410dd]
/home/ncrashed/dev/d/dmd-test/dmd-test(_Dmain+0x1a) [0x43df3a]
/home/ncrashed/dev/d/dmd-test/dmd-test(_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv+0x28)
[0x44aeac]
/home/ncrashed/dev/d/dmd-test/dmd-test(void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate())+0x2d)
[0x44adf1]
/home/ncrashed/dev/d/dmd-test/dmd-test(void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).runAll()+0x2d) [0x44ae51]
/home/ncrashed/dev/d/dmd-test/dmd-test(void
rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate())+0x2d)
[0x44adf1]
/home/ncrashed/dev/d/dmd-test/dmd-test(_d_run_main+0x192)
[0x44ad66]
/home/ncrashed/dev/d/dmd-test/dmd-test(main+0x25) [0x448355]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x39e9021d65]
```
Does DList requires any explicit initialization now or it is a
regression?
