[INFO] fetching crate savefile 0.7.2...
[INFO] checking savefile-0.7.2 against try#05c8870159e4f328578a970e125aa76d24f03b56 for pr-76219
[INFO] extracting crate savefile 0.7.2 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate savefile 0.7.2 on toolchain 05c8870159e4f328578a970e125aa76d24f03b56
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+05c8870159e4f328578a970e125aa76d24f03b56" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate savefile 0.7.2
[INFO] finished tweaking crates.io crate savefile 0.7.2
[INFO] tweaked toml for crates.io crate savefile 0.7.2 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+05c8870159e4f328578a970e125aa76d24f03b56" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+05c8870159e4f328578a970e125aa76d24f03b56" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded savefile-derive v0.7.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+05c8870159e4f328578a970e125aa76d24f03b56" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b1778fe8e9c7f1b6847442bf98072c07e24a160dcbc94e609a2fea72246685d5
[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" "b1778fe8e9c7f1b6847442bf98072c07e24a160dcbc94e609a2fea72246685d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b1778fe8e9c7f1b6847442bf98072c07e24a160dcbc94e609a2fea72246685d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b1778fe8e9c7f1b6847442bf98072c07e24a160dcbc94e609a2fea72246685d5", kill_on_drop: false }`
[INFO] [stdout] b1778fe8e9c7f1b6847442bf98072c07e24a160dcbc94e609a2fea72246685d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+05c8870159e4f328578a970e125aa76d24f03b56" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] efc80e2e7ff13db523b6e908c1beb2d7299f8276db13315f5b29d2b168c4b1f6
[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" "efc80e2e7ff13db523b6e908c1beb2d7299f8276db13315f5b29d2b168c4b1f6", kill_on_drop: false }`
[INFO] [stderr]     Checking gimli v0.22.0
[INFO] [stderr]     Checking adler v0.2.3
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking smallvec v1.4.2
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
[INFO] [stderr]     Checking object v0.20.0
[INFO] [stderr]     Checking hashbrown v0.9.0
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]     Checking untrusted v0.7.1
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking arrayvec v0.5.1
[INFO] [stderr]    Compiling ring v0.16.15
[INFO] [stderr]    Compiling bzip2-sys v0.1.9+1.0.8
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]    Compiling savefile v0.7.2 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking miniz_oxide v0.4.1
[INFO] [stderr]    Compiling syn v1.0.40
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking bzip2 v0.3.3
[INFO] [stderr]     Checking addr2line v0.13.0
[INFO] [stderr]    Compiling savefile-derive v0.7.4
[INFO] [stderr]     Checking backtrace v0.3.50
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]     --> src/lib.rs:3741:39
[INFO] [stdout]      |
[INFO] [stdout] 3741 |     fn introspect_child<'a>(&'a self, index: usize) -> Option<Box<dyn IntrospectItem<'a>>> {
[INFO] [stdout]      |                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]     --> src/lib.rs:3741:39
[INFO] [stdout]      |
[INFO] [stdout] 3741 |     fn introspect_child<'a>(&'a self, index: usize) -> Option<Box<dyn IntrospectItem<'a>>> {
[INFO] [stdout]      |                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 58.14s
[INFO] running `Command { std: "docker" "inspect" "efc80e2e7ff13db523b6e908c1beb2d7299f8276db13315f5b29d2b168c4b1f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "efc80e2e7ff13db523b6e908c1beb2d7299f8276db13315f5b29d2b168c4b1f6", kill_on_drop: false }`
[INFO] [stdout] efc80e2e7ff13db523b6e908c1beb2d7299f8276db13315f5b29d2b168c4b1f6