LDC 0.16.0 alpha3 is out! Get it, test it, give feedback!

[Jack Stouffer via Digitalmars-d-announce]

On Thursday, 17 September 2015 at 14:51:32 UTC, Jack Stouffer 
wrote:
> On Wednesday, 16 September 2015 at 20:03:15 UTC, Kai Nacke 
> wrote:
>> Hi everyone,
>>
>> LDC 0.16.0 alpha3, the LLVM-based D compiler, is available for 
>> download!
>
> Is there anyway to get dub to use this as a compiler so I can 
> test this out?

My dub build is failing with LDC but working with DMD. All I get 
is this unhelpful error message

$ dub build --compiler=ldc2
Target derelict-util 2.0.3 is up to date. Use --force to rebuild.
Building derelict-sdl2 1.9.7 configuration "library", build type 
debug.
Running ldc2...
Target derelict-gl3 1.0.15 is up to date. Use --force to rebuild.
Building dgame 0.6.3 configuration "lib", build type debug.
Running ldc2...
Building dungeon ~master configuration "application", build type 
debug.
Running ldc2...
FAIL 
.dub/build/application-debug-posix.osx-x86_64-ldc_0-C7E5B672CD1184CE7A0D4F80B1606A44/ dungeon executable
Error executing command build:
ldc2 failed with exit code -11.

How does one debug dub builds?