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<@U053J9JB4>: what OSX version did you use to build that?  Yosemite / 10.10?

Does this error ring any bells for anyone? <https://travis-ci.org/pantsbuild/pants/jobs/71004753>

Using cached artifacts for 1 target.
00:34:54 00:24           [zinc]
                         [info] 'compiler-interface' not yet compiled for Scala 2.10.4. Compiling...
                         [info]   Compilation completed in 19.869 s
                         [info] Compiling 2 Scala sources and 1 Java source to /home/travis/build/pantsbuild/pants/.pants.d/compile/jvm/scala/classes...
                         [error] error while loading &lt;root&gt;, error in opening zip file
                         [error] object scala.runtime in compiler mirror not found.

<@U051221NF>: we have seen this before, but I'm not seeing an obvious fix

I have yet to put effort into understanding the dynamic compiling of the compiler interface - I did see pre-builts were available.  Benjy - is there any reason we shouldn't be using the pre-builts to your knowledge?

IE: These presumably are useful?: <http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22com.typesafe.sbt%22%20AND%20a%3A%22compiler-interface-precompiled%22>

Ah - sorry for the noise.  Just looked at <https://repo1.maven.org/maven2/com/typesafe/sbt/compiler-interface-precompiled/0.13.8/compiler-interface-precompiled-0.13.8.pom> and it pulls in scala-library 2.10.4 which is almost certainly not what a pants install wants - it'll be 2.10.other or 2.11 or ... but not 2.10.4

the dynamic compiling of the compiler interface is to enable cross-compiling, which we don't currently support?

Aha - right.  Correct - we do not support that

i don't see an issue with switching to a pre-compiled lib assuming they're available for any relevant version

and we'd need magic (extra ivy introspection) or tables to keep track of which were

...ah, yea. if the artifact doesn't have the version suffix, they probably didn't intend it to be consumed

so - on the surface - zinc thinks the scala-library.jar is corrupt

It happened a second time when I re-ran the test

apparently travis ci machines have hard drives made out of cheese

yep. all good now: <https://travis-ci.org/pantsbuild/pants/builds/71004749>