[INFO] fetching crate histogram-sampler 0.5.0...
[INFO] testing histogram-sampler-0.5.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate histogram-sampler 0.5.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate histogram-sampler 0.5.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate histogram-sampler 0.5.0
[INFO] finished tweaking crates.io crate histogram-sampler 0.5.0
[INFO] tweaked toml for crates.io crate histogram-sampler 0.5.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 28a46cd412da73fcc05dd2378e826e976e35946bebdac80f77fd7a28565668ea
[INFO] running `Command { std: "docker" "start" "-a" "28a46cd412da73fcc05dd2378e826e976e35946bebdac80f77fd7a28565668ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "28a46cd412da73fcc05dd2378e826e976e35946bebdac80f77fd7a28565668ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28a46cd412da73fcc05dd2378e826e976e35946bebdac80f77fd7a28565668ea", kill_on_drop: false }`
[INFO] [stdout] 28a46cd412da73fcc05dd2378e826e976e35946bebdac80f77fd7a28565668ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5c29117bd409a7d1719d26d1ad36678553841630e06253fcbd42bc5f2dd37bd1
[INFO] running `Command { std: "docker" "start" "-a" "5c29117bd409a7d1719d26d1ad36678553841630e06253fcbd42bc5f2dd37bd1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling histogram-sampler v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.51s
[INFO] running `Command { std: "docker" "inspect" "5c29117bd409a7d1719d26d1ad36678553841630e06253fcbd42bc5f2dd37bd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c29117bd409a7d1719d26d1ad36678553841630e06253fcbd42bc5f2dd37bd1", kill_on_drop: false }`
[INFO] [stdout] 5c29117bd409a7d1719d26d1ad36678553841630e06253fcbd42bc5f2dd37bd1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 392adf50195dc4c426ee8eb312a7d9c7e354545139b9c867fdac5aecde13130c
[INFO] running `Command { std: "docker" "start" "-a" "392adf50195dc4c426ee8eb312a7d9c7e354545139b9c867fdac5aecde13130c", kill_on_drop: false }`
[INFO] [stderr]    Compiling histogram-sampler v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.53s
[INFO] running `Command { std: "docker" "inspect" "392adf50195dc4c426ee8eb312a7d9c7e354545139b9c867fdac5aecde13130c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "392adf50195dc4c426ee8eb312a7d9c7e354545139b9c867fdac5aecde13130c", kill_on_drop: false }`
[INFO] [stdout] 392adf50195dc4c426ee8eb312a7d9c7e354545139b9c867fdac5aecde13130c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0b7550dcb752cafb81898149a3cfe24002f379f8db338800a40133249e094b08
[INFO] running `Command { std: "docker" "start" "-a" "0b7550dcb752cafb81898149a3cfe24002f379f8db338800a40133249e094b08", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.44s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/histogram_sampler-308ccf76f6e59a0e)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 1.67s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests histogram-sampler
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 39) ... ok
[INFO] [stdout] test src/lib.rs - Sampler (line 97) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.94s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0b7550dcb752cafb81898149a3cfe24002f379f8db338800a40133249e094b08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b7550dcb752cafb81898149a3cfe24002f379f8db338800a40133249e094b08", kill_on_drop: false }`
[INFO] [stdout] 0b7550dcb752cafb81898149a3cfe24002f379f8db338800a40133249e094b08