[INFO] fetching crate string-builder 0.2.0...
[INFO] testing string-builder-0.2.0 against 1.49.0 for beta-1.50-1
[INFO] extracting crate string-builder 0.2.0 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate string-builder 0.2.0 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 string-builder 0.2.0
[INFO] finished tweaking crates.io crate string-builder 0.2.0
[INFO] tweaked toml for crates.io crate string-builder 0.2.0 written to /workspace/builds/worker-11/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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] c83f874d2ea0841f76f00271a397423cf7817a8e42a8665132bd15eb995ca49f
[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" "c83f874d2ea0841f76f00271a397423cf7817a8e42a8665132bd15eb995ca49f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c83f874d2ea0841f76f00271a397423cf7817a8e42a8665132bd15eb995ca49f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c83f874d2ea0841f76f00271a397423cf7817a8e42a8665132bd15eb995ca49f", kill_on_drop: false }`
[INFO] [stdout] c83f874d2ea0841f76f00271a397423cf7817a8e42a8665132bd15eb995ca49f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 35c6c6132e5aa190b6031d4211ff3abe046c3412109930b29ae5e3742cf453f8
[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" "35c6c6132e5aa190b6031d4211ff3abe046c3412109930b29ae5e3742cf453f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling string-builder v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "35c6c6132e5aa190b6031d4211ff3abe046c3412109930b29ae5e3742cf453f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35c6c6132e5aa190b6031d4211ff3abe046c3412109930b29ae5e3742cf453f8", kill_on_drop: false }`
[INFO] [stdout] 35c6c6132e5aa190b6031d4211ff3abe046c3412109930b29ae5e3742cf453f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 699583a12e0703fd88d20446545fb7eae0c3758466583c42814f4a56c83c35dc
[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" "699583a12e0703fd88d20446545fb7eae0c3758466583c42814f4a56c83c35dc", kill_on_drop: false }`
[INFO] [stderr]    Compiling string-builder v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.98s
[INFO] running `Command { std: "docker" "inspect" "699583a12e0703fd88d20446545fb7eae0c3758466583c42814f4a56c83c35dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "699583a12e0703fd88d20446545fb7eae0c3758466583c42814f4a56c83c35dc", kill_on_drop: false }`
[INFO] [stdout] 699583a12e0703fd88d20446545fb7eae0c3758466583c42814f4a56c83c35dc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] db2e9d421681c81035e2f4f2577e514ceb678dee1c8eff4015c77cb4b5b463fd
[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" "db2e9d421681c81035e2f4f2577e514ceb678dee1c8eff4015c77cb4b5b463fd", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stdout] running 3 tests
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/string_builder-5986453d13912859
[INFO] [stdout] test tests::test_individual_unicode_characters ... ok
[INFO] [stderr]    Doc-tests string-builder
[INFO] [stdout] test tests::test_tool_album ... ok
[INFO] [stdout] test tests::test_all_supported_types ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test src/lib.rs - Builder::string (line 60) ... ok
[INFO] [stdout] test src/lib.rs - Builder::append (line 30) ... ok
[INFO] [stdout] test src/lib.rs - Builder::len (line 44) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "db2e9d421681c81035e2f4f2577e514ceb678dee1c8eff4015c77cb4b5b463fd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "db2e9d421681c81035e2f4f2577e514ceb678dee1c8eff4015c77cb4b5b463fd", kill_on_drop: false }`
[INFO] [stdout] db2e9d421681c81035e2f4f2577e514ceb678dee1c8eff4015c77cb4b5b463fd