[INFO] fetching crate mini-v8 0.2.1...
[INFO] checking mini-v8-0.2.1 against master#c724b67e1b474262917a5154d74e7072267593fe for pr-74315
[INFO] extracting crate mini-v8 0.2.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate mini-v8 0.2.1 on toolchain c724b67e1b474262917a5154d74e7072267593fe
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mini-v8 0.2.1
[INFO] finished tweaking crates.io crate mini-v8 0.2.1
[INFO] tweaked toml for crates.io crate mini-v8 0.2.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate mini-v8 0.2.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b212de7cb8c13cb9b701a906d258c2e1586ec8cdc9bc20543979d5a2e713d59d
[INFO] running `Command { std: "docker" "start" "-a" "b212de7cb8c13cb9b701a906d258c2e1586ec8cdc9bc20543979d5a2e713d59d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b212de7cb8c13cb9b701a906d258c2e1586ec8cdc9bc20543979d5a2e713d59d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b212de7cb8c13cb9b701a906d258c2e1586ec8cdc9bc20543979d5a2e713d59d", kill_on_drop: false }`
[INFO] [stdout] b212de7cb8c13cb9b701a906d258c2e1586ec8cdc9bc20543979d5a2e713d59d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+c724b67e1b474262917a5154d74e7072267593fe" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 033e8b8a3a8d2923d244438a9710578ef46abe0bef50422f1d70602b0e401c06
[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" "033e8b8a3a8d2923d244438a9710578ef46abe0bef50422f1d70602b0e401c06", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking unicode-segmentation v1.3.0
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling mini-v8 v0.2.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking dirs-sys v0.3.4
[INFO] [stderr]     Checking log v0.4.8
[INFO] [stdout] error: environment variable `V8_PATH` not defined
[INFO] [stdout]  --> build.rs:4:14
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let v8 = env!("V8_PATH");
[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 `mini-v8`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "033e8b8a3a8d2923d244438a9710578ef46abe0bef50422f1d70602b0e401c06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "033e8b8a3a8d2923d244438a9710578ef46abe0bef50422f1d70602b0e401c06", kill_on_drop: false }`
[INFO] [stdout] 033e8b8a3a8d2923d244438a9710578ef46abe0bef50422f1d70602b0e401c06