Appender example doesn't work with GDC. GDC bug?

[BoraxMan]

On Saturday, 28 December 2019 at 10:41:56 UTC, Mike Parker wrote:
> On Saturday, 28 December 2019 at 08:25:16 UTC, BoraxMan wrote:
>
>> The problem is that GDC is part of GCC now, and part of the 
>> Fedora installation I'm using.  I take it then if I am to 
>> start a new project where I may end up providing binaries, I 
>> should eschew using the GDC compiler and use LDC instead?  
>> This kind of consideration is not an issue when using C or C++ 
>> (at least in Linux).  By default the choice is correct.
>
> If by "correct" you mean the latest and greatest in terms of 
> language and library features, then that means DMD. GDC doesn't 
> have the sort of manpower behind that gcc and g++ benefit from. 
> As I understand it, the version that ships with GCC was further 
> hampered by being locked in quite some time ago due to the GCC 
> release cycle.
>
> You have three D compilers to choose from. Use the one that 
> meets your needs. They all can put out compatible binary output 
> on any given platform.

What I mean by 'correct', is that despite the fact there are 
different C stdlibs out there overall, there is generally one 
which forms the core of a Linux install, and the same is true 
with other unices, as far as I can tell.  For Linux, its glibc, 
regardless of whether I choose GCC or CLANG, the binary links to 
one libc, the same one.  With D though, there is a libphobos for 
each compiler, so if a Linux distro for example was to start 
packaging D software, they would probably want to settle on a 
specific libphobos, which means me using a different compiler 
would mean the end user having to bring in a second libphobos on 
top of the one the distro was designed around.  Then you have 
libraries which may also use libphobos, such as dlangui, which a 
program may link against.

The right compiler is the one which fits best in the "ecosystem" 
of my target audience, not the best for me personally.