[INFO] fetching crate pylon-sys 0.1.2...
[INFO] testing pylon-sys-0.1.2 against 1.49.0 for beta-1.50-1
[INFO] extracting crate pylon-sys 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate pylon-sys 0.1.2 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate pylon-sys 0.1.2
[INFO] finished tweaking crates.io crate pylon-sys 0.1.2
[INFO] tweaked toml for crates.io crate pylon-sys 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4fc02a6f1ef525e511ff89e530aedaef0d9fe0f740ea7cd75bbdda458e1e6ae0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4fc02a6f1ef525e511ff89e530aedaef0d9fe0f740ea7cd75bbdda458e1e6ae0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4fc02a6f1ef525e511ff89e530aedaef0d9fe0f740ea7cd75bbdda458e1e6ae0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4fc02a6f1ef525e511ff89e530aedaef0d9fe0f740ea7cd75bbdda458e1e6ae0", kill_on_drop: false }`
[INFO] [stdout] 4fc02a6f1ef525e511ff89e530aedaef0d9fe0f740ea7cd75bbdda458e1e6ae0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bbc6abd628ea8b38b7b685aff862f6ff17a9672e69dc0c5fb06475991788dd6f
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bbc6abd628ea8b38b7b685aff862f6ff17a9672e69dc0c5fb06475991788dd6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling bindgen v0.50.1
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling which v2.0.1
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling pylon-sys v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: environment variable `PYLON_ROOT` not defined
[INFO] [stdout]  --> build.rs:7:22
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let pylon_root = env!("PYLON_ROOT");
[INFO] [stdout]   |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pylon-sys`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "bbc6abd628ea8b38b7b685aff862f6ff17a9672e69dc0c5fb06475991788dd6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbc6abd628ea8b38b7b685aff862f6ff17a9672e69dc0c5fb06475991788dd6f", kill_on_drop: false }`
[INFO] [stdout] bbc6abd628ea8b38b7b685aff862f6ff17a9672e69dc0c5fb06475991788dd6f