Remove usage of Comma expression

[Geod24]

No description provided.

[coveralls]

Coverage decreased (-0.03%) to 60.277% when pulling 69a0454 on Geod24:commaexp into 4079e0e on dlang:master.

[Geod24]

What's up with the 2.064 failure ?

3.64s$ source "$(curl -fsS  --retry 3 https://dlang.org/install.sh | CURL_USER_AGENT="$CURL_USER_AGENT" bash -s dmd-2.064.2 --activate)"
curl: (22) The requested URL returned error: 403
Invalid signature http://downloads.dlang.org/releases/2.x/2.064/dmd.2.064.2.zip.sig
/home/travis/build.sh: line 45: : No such file or directory
The command "source "$(curl -fsS  --retry 3 https://dlang.org/install.sh | CURL_USER_AGENT="$CURL_USER_AGENT" bash -s dmd-2.064.2 --activate)"" failed and exited with 1 during 

[s-ludwig]

Looks like the Travis build script got an update, maybe that's causing the issue. BTW, are 2.064.x based compilers still in the current Linux distributions? Maybe we can start to think about dropping 2.064 support.