Magma test failure

[Ross Boylan]

Shortly after starting the test _magmaTestclient1.image show
"MagmaUserError: WriteBarrier requires NewCompiler."

Hmm, I was going to copy the tail end of the Transcript of
_magmaTestConductor into this message, but that image is unresponsive.

I'm running on Debian GNU/Linux with squeak-vm 3.10.3+svn1902.dfsg-1 and
the 3.10 image downloaded from
http://ftp.squeak.org/3.10/Squeak3.10.2-7179-basic.zip.

Magma was tested with 3.10.4 (VM).  Is the new compiler something added
with the 3.10.4 release?  I see a package by that name on SM (marked as
very alpha).