error: failed to run custom build command for `engine v0.0.1 (file:///home/travis/build/pantsbuild/pants/src/rust/engine)`
process didn't exit successfully: `/home/travis/build/pantsbuild/pants/src/rust/engine/target/debug/build/engine-1ca951c3d239aab9/build-script-cffi_build` (exit code: 1)
--- stdout
cargo:rustc-link-lib=static=stdc++
cargo:rerun-if-changed=/home/travis/build/pantsbuild/pants/build-support/bin/native/bootstrap_cffi.sh
cargo:rerun-if-changed=/home/travis/build/pantsbuild/pants/src/python/pants/engine/native.py
cargo:rerun-if-changed=src/cffi/native_engine.c
cargo:rerun-if-changed=src/cffi/native_engine.cflags
--- stderr
Traceback (most recent call last):
  File "/home/travis/build/pantsbuild/pants/build-support/pants_dev_deps.venv/lib/python2.7/site.py", line 67, in <module>
    import os
  File "/home/travis/build/pantsbuild/pants/build-support/pants_dev_deps.venv/lib/python2.7/os.py", line 49, in <module>
    import posixpath as path
  File "/home/travis/build/pantsbuild/pants/build-support/pants_dev_deps.venv/lib/python2.7/posixpath.py", line 17, in <module>
    import warnings
ImportError: No module named warnings
Execution of "/home/travis/build/pantsbuild/pants/build-support/bin/native/bootstrap_cffi.sh" failed with exit code Some(1)
warning: build failed, waiting for other jobs to finish...
error: build failed
Pants rust test failure