latest sha on rustio branch

$ ./pants --enable-v2-engine --no-verify-config list ::
Running pants from source with sha 381a03d16425502dfd9ef2a5f40128e8c234c29e .....

peaked out at ~6gb but finished with error that @rough-minister-58256 pasted above sha d966f9592fba2040429fc8a64f8aa4deb5e61f2c on rustio branch peaked out/crashed at ~23gb for

$ ./pants --enable-v2-engine --no-verify-config list ::

osx 10.11.6