[INFO] fetching crate chainmap 0.1.2...
[INFO] testing chainmap-0.1.2 against 1.55.0 for beta-1.56-1
[INFO] extracting crate chainmap 0.1.2 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate chainmap 0.1.2 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 chainmap 0.1.2
[INFO] finished tweaking crates.io crate chainmap 0.1.2
[INFO] tweaked toml for crates.io crate chainmap 0.1.2 written to /workspace/builds/worker-13/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 67d7a1e49922fb6a4b7fd9e72566ceb2891f96c6c65bc0448bcf1b2d831abb4a
[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" "67d7a1e49922fb6a4b7fd9e72566ceb2891f96c6c65bc0448bcf1b2d831abb4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "67d7a1e49922fb6a4b7fd9e72566ceb2891f96c6c65bc0448bcf1b2d831abb4a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67d7a1e49922fb6a4b7fd9e72566ceb2891f96c6c65bc0448bcf1b2d831abb4a", kill_on_drop: false }`
[INFO] [stdout] 67d7a1e49922fb6a4b7fd9e72566ceb2891f96c6c65bc0448bcf1b2d831abb4a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] 4791a8e8f8f8327721c71bdd065d2a77bfd0c142a88af01165be5258dafe8a53
[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" "4791a8e8f8f8327721c71bdd065d2a77bfd0c142a88af01165be5258dafe8a53", kill_on_drop: false }`
[INFO] [stderr]    Compiling chainmap v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:416:9
[INFO] [stdout]     |
[INFO] [stdout] 416 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.10s
[INFO] running `Command { std: "docker" "inspect" "4791a8e8f8f8327721c71bdd065d2a77bfd0c142a88af01165be5258dafe8a53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4791a8e8f8f8327721c71bdd065d2a77bfd0c142a88af01165be5258dafe8a53", kill_on_drop: false }`
[INFO] [stdout] 4791a8e8f8f8327721c71bdd065d2a77bfd0c142a88af01165be5258dafe8a53
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] cc890a23970fc93f777335f8932b7e24ec92df947c133b6af07b392ed39cd513
[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" "cc890a23970fc93f777335f8932b7e24ec92df947c133b6af07b392ed39cd513", kill_on_drop: false }`
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling chainmap v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:416:9
[INFO] [stdout]     |
[INFO] [stdout] 416 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:331:9
[INFO] [stdout]     |
[INFO] [stdout] 331 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/lib.rs:416:9
[INFO] [stdout]     |
[INFO] [stdout] 416 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.64s
[INFO] running `Command { std: "docker" "inspect" "cc890a23970fc93f777335f8932b7e24ec92df947c133b6af07b392ed39cd513", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc890a23970fc93f777335f8932b7e24ec92df947c133b6af07b392ed39cd513", kill_on_drop: false }`
[INFO] [stdout] cc890a23970fc93f777335f8932b7e24ec92df947c133b6af07b392ed39cd513
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8db7fc0ec55c3a6e33172db83bee8a682bf73c805fb8451570d0d07f5eaeee26
[INFO] running `Command { std: "docker" "start" "-a" "8db7fc0ec55c3a6e33172db83bee8a682bf73c805fb8451570d0d07f5eaeee26", kill_on_drop: false }`
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/lib.rs:331:9
[INFO] [stderr]     |
[INFO] [stderr] 331 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stderr]    --> src/lib.rs:416:9
[INFO] [stderr]     |
[INFO] [stderr] 416 |         std::mem::replace(&mut *self, oldlevel);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] warning: `chainmap` (lib) generated 2 warnings
[INFO] [stderr] warning: `chainmap` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/chainmap-097c3f008f14f1fb)
[INFO] [stdout] 
[INFO] [stdout] running 19 tests
[INFO] [stdout] test test::deep_get ... ok
[INFO] [stdout] test test::clone_copies_one_layer ... ok
[INFO] [stdout] test test::fork ... ok
[INFO] [stdout] test test::fork_with ... ok
[INFO] [stdout] test test::update ... ok
[INFO] [stdout] test test::override_insert ... ok
[INFO] [stdout] test test::basics ... ok
[INFO] [stdout] test test::update_or ... ok
[INFO] [stdout] test test::local_get ... ok
[INFO] [stdout] test test::update_or_readonly ... ok
[INFO] [stdout] test test::collect ... ok
[INFO] [stdout] test test::update_or_preserves_lock ... ok
[INFO] [stdout] test test::insert_and_get ... ok
[INFO] [stdout] test test::self_bypass_readonly ... ok
[INFO] [stdout] test test::lock_and_unlock ... ok
[INFO] [stdout] test test::update_missing - should panic ... ok
[INFO] [stdout] test test::update_write_protect - should panic ... ok
[INFO] [stdout] test test::insert_despite_lock - should panic ... ok
[INFO] [stdout] test test::update_despite_lock - should panic ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests chainmap
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - ChainMap<K, V>::extend_with (line 271) ... ok
[INFO] [stdout] test src/lib.rs - ChainMap<K, V>::fork_with (line 376) ... ok
[INFO] [stdout] test src/lib.rs - ChainMap<K, V>::fork_with (line 344) ... ok
[INFO] [stdout] test src/lib.rs - ChainMap<K, V>::extend_with (line 242) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.10s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8db7fc0ec55c3a6e33172db83bee8a682bf73c805fb8451570d0d07f5eaeee26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8db7fc0ec55c3a6e33172db83bee8a682bf73c805fb8451570d0d07f5eaeee26", kill_on_drop: false }`
[INFO] [stdout] 8db7fc0ec55c3a6e33172db83bee8a682bf73c805fb8451570d0d07f5eaeee26