Try to compile this:

import std.stdio;

auto xxx(T)()
{
     return this;
}

struct S
{
    mixin xxx!(typeof(this));
    alias xxx this;
}

void foo(S pos)
{
    writefln("(%.2f|%.2f)", pos.x, pos.y);
}

void main()
{
}


Or this:

import std.stdio;

auto xxx(T)()
if (is(T == struct))
{
     return this;
}

struct Vector2f
{
    mixin xxx!(typeof(this));
    alias xxx this;
}

void foo(ref const Vector2f pos) {}

void main()
{
    Vector2f v;
    foo(v);
}

On Tuesday, 18 October 2016 at 08:21:09 UTC, Daniel Kozak wrote:
> Try to compile this:
>
> import std.stdio;
>
> auto xxx(T)()
> {
>      return this;
> }
>
> struct S
> {
>     mixin xxx!(typeof(this));
>     alias xxx this;
> }
>
> void foo(S pos)
> {
>     writefln("(%.2f|%.2f)", pos.x, pos.y);
> }
>
> void main()
> {
> }
>
>
> Or this:
>
> import std.stdio;
>
> auto xxx(T)()
> if (is(T == struct))
> {
>      return this;
> }
>
> struct Vector2f
> {
>     mixin xxx!(typeof(this));
>     alias xxx this;
> }
>
> void foo(ref const Vector2f pos) {}
>
> void main()
> {
>     Vector2f v;
>     foo(v);
> }

Compiler bug?

Looks like it's constantly going in circles trying to figure out what the hell 'xxx' is :)
I cancelled compilation after a minute of 100% CPU usage so not sure if it will ever finish.

On Tuesday, 18 October 2016 at 11:06:08 UTC, wobbles wrote:
> On Tuesday, 18 October 2016 at 08:21:09 UTC, Daniel Kozak wrote:
>> Try to compile this:
>>
>> import std.stdio;
>>
>> auto xxx(T)()
>> {
>>      return this;
>> }
>>
>> struct S
>> {
>>     mixin xxx!(typeof(this));
>>     alias xxx this;
>> }
>>
>> void foo(S pos)
>> {
>>     writefln("(%.2f|%.2f)", pos.x, pos.y);
>> }
>>
>> void main()
>> {
>> }
>>
>>
>> Or this:
>>
>> import std.stdio;
>>
>> auto xxx(T)()
>> if (is(T == struct))
>> {
>>      return this;
>> }
>>
>> struct Vector2f
>> {
>>     mixin xxx!(typeof(this));
>>     alias xxx this;
>> }
>>
>> void foo(ref const Vector2f pos) {}
>>
>> void main()
>> {
>>     Vector2f v;
>>     foo(v);
>> }
>
> Compiler bug?
>
> Looks like it's constantly going in circles trying to figure out what the hell 'xxx' is :)
> I cancelled compilation after a minute of 100% CPU usage so not sure if it will ever finish.

With -v on, this is what it prints:
dmd compileFun.d -v
binary    dmd
version   v2.071.0
config    /usr/local/bin/dmd.conf
parse     compileFun
importall compileFun
import    object        (/Library/D/dmd/src/druntime/import/object.d)
import    core.attribute        (/Library/D/dmd/src/druntime/import/core/attribute.d)
import    std.stdio     (/Library/D/dmd/src/phobos/std/stdio.d)
import    core.stdc.stdio       (/Library/D/dmd/src/druntime/import/core/stdc/stdio.d)
import    core.stdc.stdint      (/Library/D/dmd/src/druntime/import/core/stdc/stdint.d)
import    core.stdc.stddef      (/Library/D/dmd/src/druntime/import/core/stdc/stddef.d)
import    core.stdc.signal      (/Library/D/dmd/src/druntime/import/core/stdc/signal.d)
import    core.stdc.wchar_      (/Library/D/dmd/src/druntime/import/core/stdc/wchar_.d)
import    core.stdc.config      (/Library/D/dmd/src/druntime/import/core/stdc/config.d)
import    core.stdc.stdarg      (/Library/D/dmd/src/druntime/import/core/stdc/stdarg.d)
import    core.stdc.stdlib      (/Library/D/dmd/src/druntime/import/core/stdc/stdlib.d)
import    core.stdc.time        (/Library/D/dmd/src/druntime/import/core/stdc/time.d)
import    core.sys.posix.sys.types      (/Library/D/dmd/src/druntime/import/core/sys/posix/sys/types.d)
import    core.sys.posix.config (/Library/D/dmd/src/druntime/import/core/sys/posix/config.d)
import    std.typecons  (/Library/D/dmd/src/phobos/std/typecons.d)
import    std.meta      (/Library/D/dmd/src/phobos/std/meta.d)
import    std.traits    (/Library/D/dmd/src/phobos/std/traits.d)
import    std.typetuple (/Library/D/dmd/src/phobos/std/typetuple.d)
import    std.stdiobase (/Library/D/dmd/src/phobos/std/stdiobase.d)
import    std.range.primitives  (/Library/D/dmd/src/phobos/std/range/primitives.d)
semantic  compileFun
import    core.stdc.errno       (/Library/D/dmd/src/druntime/import/core/stdc/errno.d)
import    core.stdc.string      (/Library/D/dmd/src/druntime/import/core/stdc/string.d)
entry     main          compileFun.d
semantic2 compileFun
semantic3 compileFun


And sticsk on semantic3 forever.

On 10/18/16 7:06 AM, wobbles wrote:
> Compiler bug?
>
> Looks like it's constantly going in circles trying to figure out what
> the hell 'xxx' is :)
> I cancelled compilation after a minute of 100% CPU usage so not sure if
> it will ever finish.

If I add:

alias byRef this;

to Namespace's example either in Vector2f or ByRef, I get the same behavior. Daniel, could you please submit all three examples in an issue?

Thanks,

Andrei

Dne 18.10.2016 v 13:36 Andrei Alexandrescu via Digitalmars-d napsal(a):

> On 10/18/16 7:06 AM, wobbles wrote:
>> Compiler bug?
>>
>> Looks like it's constantly going in circles trying to figure out what
>> the hell 'xxx' is :)
>> I cancelled compilation after a minute of 100% CPU usage so not sure if
>> it will ever finish.
>
> If I add:
>
> alias byRef this;
>
> to Namespace's example either in Vector2f or ByRef, I get the same behavior. Daniel, could you please submit all three examples in an issue?
>
> Thanks,
>
> Andrei
https://issues.dlang.org/show_bug.cgi?id=16621

It is based on Namespace's example, soi I belive it is same error