[INFO] fetching crate expanding_slice_rb 0.1.3...
[INFO] testing expanding_slice_rb-0.1.3 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate expanding_slice_rb 0.1.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate expanding_slice_rb 0.1.3 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate expanding_slice_rb 0.1.3
[INFO] finished tweaking crates.io crate expanding_slice_rb 0.1.3
[INFO] tweaked toml for crates.io crate expanding_slice_rb 0.1.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "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" "+beta-2021-09-08" "fetch" "--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-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" "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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0a050b59cfed4a3400b783b3bb687b4e708e25dd7d22935e4f5be0cba5cb0c14
[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" "0a050b59cfed4a3400b783b3bb687b4e708e25dd7d22935e4f5be0cba5cb0c14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0a050b59cfed4a3400b783b3bb687b4e708e25dd7d22935e4f5be0cba5cb0c14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a050b59cfed4a3400b783b3bb687b4e708e25dd7d22935e4f5be0cba5cb0c14", kill_on_drop: false }`
[INFO] [stdout] 0a050b59cfed4a3400b783b3bb687b4e708e25dd7d22935e4f5be0cba5cb0c14
[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" "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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", 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] 0f140fdd8c6e1c22e3ac9c9258364d5a2f5640083a24be19ae758c4cb3f488f7
[INFO] running `Command { std: "docker" "start" "-a" "0f140fdd8c6e1c22e3ac9c9258364d5a2f5640083a24be19ae758c4cb3f488f7", kill_on_drop: false }`
[INFO] [stderr]    Compiling slice_ring_buf v0.2.6
[INFO] [stderr]    Compiling expanding_slice_rb v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:389:17
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 let _ = &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:393:17
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 let _ = &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "0f140fdd8c6e1c22e3ac9c9258364d5a2f5640083a24be19ae758c4cb3f488f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f140fdd8c6e1c22e3ac9c9258364d5a2f5640083a24be19ae758c4cb3f488f7", kill_on_drop: false }`
[INFO] [stdout] 0f140fdd8c6e1c22e3ac9c9258364d5a2f5640083a24be19ae758c4cb3f488f7
[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" "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" "+beta-2021-09-08" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a1e61866b87668c0092b7ea8a8e8f527d43b270c478c8d52c298a6dc3995d159
[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" "a1e61866b87668c0092b7ea8a8e8f527d43b270c478c8d52c298a6dc3995d159", kill_on_drop: false }`
[INFO] [stderr]    Compiling expanding_slice_rb v0.1.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:389:17
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 let _ = &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:393:17
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 let _ = &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:389:17
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 389 |                 let _ = &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]    --> src/lib.rs:393:17
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]     |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 393 |                 let _ = &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.67s
[INFO] running `Command { std: "docker" "inspect" "a1e61866b87668c0092b7ea8a8e8f527d43b270c478c8d52c298a6dc3995d159", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a1e61866b87668c0092b7ea8a8e8f527d43b270c478c8d52c298a6dc3995d159", kill_on_drop: false }`
[INFO] [stdout] a1e61866b87668c0092b7ea8a8e8f527d43b270c478c8d52c298a6dc3995d159
[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" "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" "+beta-2021-09-08" "test" "--frozen", 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] 5dab2598f343053e696b44a52bddc4fbdd96b6872df1664d1836c4b7a8473caf
[INFO] running `Command { std: "docker" "start" "-a" "5dab2598f343053e696b44a52bddc4fbdd96b6872df1664d1836c4b7a8473caf", kill_on_drop: false }`
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/lib.rs:389:17
[INFO] [stderr]     |
[INFO] [stderr] 389 |                 &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 389 |                 let _ = &mut dst[start_data_len..start_data_len+additional].copy_from_slice(&src[0..additional]);
[INFO] [stderr]     |                 +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]    --> src/lib.rs:393:17
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]     |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]     |
[INFO] [stderr] 393 |                 let _ = &mut dst[start_data_len..start_data_len+wrapped_data_len].copy_from_slice(&src[0..wrapped_data_len]);
[INFO] [stderr]     |                 +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `expanding_slice_rb` (lib) generated 2 warnings
[INFO] [stderr] warning: `expanding_slice_rb` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/expanding_slice_rb-55f223b851c0ede1)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test tests::test ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests expanding_slice_rb
[INFO] [stdout] 
[INFO] [stdout] running 7 tests
[INFO] [stdout] test src/lib.rs - ExpSliceRB<T>::with_capacity (line 133) ... ok
[INFO] [stdout] test src/lib.rs - ExpSliceRB<T>::try_write (line 328) ... ok
[INFO] [stdout] test src/lib.rs - ExpSliceRB<T>::write (line 285) ... ok
[INFO] [stdout] test src/lib.rs - (line 20) ... ok
[INFO] [stdout] test src/lib.rs - ExpSliceRB (line 77) ... ok
[INFO] [stdout] test src/lib.rs - ExpSliceRB<T>::peek_into (line 236) ... ok
[INFO] [stdout] test src/lib.rs - ExpSliceRB<T>::read_into (line 171) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 7 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.91s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "5dab2598f343053e696b44a52bddc4fbdd96b6872df1664d1836c4b7a8473caf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5dab2598f343053e696b44a52bddc4fbdd96b6872df1664d1836c4b7a8473caf", kill_on_drop: false }`
[INFO] [stdout] 5dab2598f343053e696b44a52bddc4fbdd96b6872df1664d1836c4b7a8473caf