[INFO] crate pylon 0.2.0 is already in cache
[INFO] extracting crate pylon 0.2.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/pylon/0.2.0
[INFO] extracting crate pylon 0.2.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/pylon/0.2.0
[INFO] validating manifest of pylon-0.2.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of pylon-0.2.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing pylon-0.2.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] fd8e891c6c94e5a7e2a77bdd2cbb05d483a7e6381c77a8a6c4fbc0718ed0dc81
[INFO] running `"docker" "start" "-a" "fd8e891c6c94e5a7e2a77bdd2cbb05d483a7e6381c77a8a6c4fbc0718ed0dc81"`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling rustc-demangle v0.1.15
[INFO] [stderr]    Compiling bindgen v0.50.0
[INFO] [stderr]    Compiling imgref v1.3.5
[INFO] [stderr]    Compiling rgb v0.8.13
[INFO] [stderr]    Compiling regex-syntax v0.6.10
[INFO] [stderr]    Compiling clang-sys v0.28.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling aho-corasick v0.7.4
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling atty v0.2.13
[INFO] [stderr]    Compiling backtrace-sys v0.1.31
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling cexpr v0.3.5
[INFO] [stderr]    Compiling backtrace v0.3.33
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling regex v1.2.0
[INFO] [stderr]    Compiling env_logger v0.6.2
[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" "fd8e891c6c94e5a7e2a77bdd2cbb05d483a7e6381c77a8a6c4fbc0718ed0dc81"`
[INFO] running `"docker" "rm" "-f" "fd8e891c6c94e5a7e2a77bdd2cbb05d483a7e6381c77a8a6c4fbc0718ed0dc81"`
[INFO] [stdout] fd8e891c6c94e5a7e2a77bdd2cbb05d483a7e6381c77a8a6c4fbc0718ed0dc81