[INFO] fetching crate pylon 0.2.0...
[INFO] extracting crate pylon 0.2.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/pylon/0.2.0
[INFO] extracting crate pylon 0.2.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/pylon/0.2.0
[INFO] validating manifest of pylon-0.2.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of pylon-0.2.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing pylon-0.2.0
[INFO] finished frobbing pylon-0.2.0
[INFO] frobbed toml for pylon-0.2.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/pylon/0.2.0/Cargo.toml
[INFO] started frobbing pylon-0.2.0
[INFO] finished frobbing pylon-0.2.0
[INFO] frobbed toml for pylon-0.2.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/pylon/0.2.0/Cargo.toml
[INFO] crate pylon-0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing pylon-0.2.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/pylon/0.2.0:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 753395cc0114025e5f0194ea75056da1c53f623c8a83ad7ad6544f94a7fc7776
[INFO] running `"docker" "start" "-a" "753395cc0114025e5f0194ea75056da1c53f623c8a83ad7ad6544f94a7fc7776"`
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling bindgen v0.50.0
[INFO] [stderr]    Compiling shlex v0.1.1
[INFO] [stderr]    Compiling imgref v1.3.5
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling clang-sys v0.28.0
[INFO] [stderr]    Compiling backtrace v0.3.33
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling cexpr v0.3.5
[INFO] [stderr]    Compiling pylon-sys v0.1.2
[INFO] [stderr] error: environment variable `PYLON_ROOT` not defined
[INFO] [stderr]  --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/pylon-sys-0.1.2/build.rs:7:22
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let pylon_root = env!("PYLON_ROOT");
[INFO] [stderr]   |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `pylon-sys`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "753395cc0114025e5f0194ea75056da1c53f623c8a83ad7ad6544f94a7fc7776"`
[INFO] running `"docker" "rm" "-f" "753395cc0114025e5f0194ea75056da1c53f623c8a83ad7ad6544f94a7fc7776"`
[INFO] [stdout] 753395cc0114025e5f0194ea75056da1c53f623c8a83ad7ad6544f94a7fc7776