[INFO] fetching crate math-ast 0.2.0...
[INFO] checking math-ast-0.2.0 against master#0d37dca25a51fb900a402c94c8818ad1c2789e30 for pr-77526
[INFO] extracting crate math-ast 0.2.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate math-ast 0.2.0 on toolchain 0d37dca25a51fb900a402c94c8818ad1c2789e30
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate math-ast 0.2.0
[INFO] finished tweaking crates.io crate math-ast 0.2.0
[INFO] tweaked toml for crates.io crate math-ast 0.2.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 991bf0f14ccf62eacd797e8700f2c31b0afa36a1da68cd6b1328ab134a05c044
[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" "991bf0f14ccf62eacd797e8700f2c31b0afa36a1da68cd6b1328ab134a05c044", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "991bf0f14ccf62eacd797e8700f2c31b0afa36a1da68cd6b1328ab134a05c044", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "991bf0f14ccf62eacd797e8700f2c31b0afa36a1da68cd6b1328ab134a05c044", kill_on_drop: false }`
[INFO] [stdout] 991bf0f14ccf62eacd797e8700f2c31b0afa36a1da68cd6b1328ab134a05c044
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=forbid" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+0d37dca25a51fb900a402c94c8818ad1c2789e30" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 88035efd797a85e0ef3d96a77c25cdaaa4a770504100e93856b1ebb7ae2ad3a5
[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" "88035efd797a85e0ef3d96a77c25cdaaa4a770504100e93856b1ebb7ae2ad3a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking num-complex v0.3.0
[INFO] [stderr]     Checking factorial v0.2.0
[INFO] [stderr]     Checking num v0.3.0
[INFO] [stderr]     Checking math-ast v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.79s
[INFO] running `Command { std: "docker" "inspect" "88035efd797a85e0ef3d96a77c25cdaaa4a770504100e93856b1ebb7ae2ad3a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88035efd797a85e0ef3d96a77c25cdaaa4a770504100e93856b1ebb7ae2ad3a5", kill_on_drop: false }`
[INFO] [stdout] 88035efd797a85e0ef3d96a77c25cdaaa4a770504100e93856b1ebb7ae2ad3a5