Segfaults during pretty printing tests

[alexcrichton]

These have started cropping up recently

http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/256
http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/255
http://buildbot.rust-lang.org/builders/auto-mac-64-opt/builds/1153
http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/1160

cc #8458

[alexcrichton]

Or maybe this is happening just during the test suite

http://buildbot.rust-lang.org/builders/auto-mac-32-opt/builds/1157

It's very likely that this is affiliated with the libuv process bindings.

[alexcrichton]

Yeah these are just piling up:

http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/270/

I'm investigating...

[huonw]

Linux segfaulted there too: http://buildbot.rust-lang.org/builders/auto-linux-32-nopt-t/builds/280

[alexcrichton]

libuv was reverted, this has been fixed (for now)