[INFO] updating cached repository acmumn/minnehack-blockchain-check-in
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/acmumn/minnehack-blockchain-check-in
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/acmumn/minnehack-blockchain-check-in" "work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/acmumn/minnehack-blockchain-check-in"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/acmumn/minnehack-blockchain-check-in'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/acmumn/minnehack-blockchain-check-in" "work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/acmumn/minnehack-blockchain-check-in"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/acmumn/minnehack-blockchain-check-in'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b75908ad2b87b7c31018b8e2e7f8df6aa3092831
[INFO] sha for GitHub repo acmumn/minnehack-blockchain-check-in: b75908ad2b87b7c31018b8e2e7f8df6aa3092831
[INFO] validating manifest of acmumn/minnehack-blockchain-check-in on toolchain master#efe2f32a6b8217425f361ec7c206910c611c03ee
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of acmumn/minnehack-blockchain-check-in on toolchain try#78b0bd8441ef961f6475e3d47fe3bca38cb83432
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing acmumn/minnehack-blockchain-check-in
[INFO] removed workspace from acmumn/minnehack-blockchain-check-in
[INFO] finished frobbing acmumn/minnehack-blockchain-check-in
[INFO] frobbed toml for acmumn/minnehack-blockchain-check-in written to work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/acmumn/minnehack-blockchain-check-in/Cargo.toml
[INFO] started frobbing acmumn/minnehack-blockchain-check-in
[INFO] removed workspace from acmumn/minnehack-blockchain-check-in
[INFO] finished frobbing acmumn/minnehack-blockchain-check-in
[INFO] frobbed toml for acmumn/minnehack-blockchain-check-in written to work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/acmumn/minnehack-blockchain-check-in/Cargo.toml
[INFO] crate acmumn/minnehack-blockchain-check-in already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/acmumn/minnehack-blockchain-check-in/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking acmumn/minnehack-blockchain-check-in against master#efe2f32a6b8217425f361ec7c206910c611c03ee for pr-60039
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039/worker-7/master#efe2f32a6b8217425f361ec7c206910c611c03ee:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/acmumn/minnehack-blockchain-check-in:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5718475b341b729402ebdb95a20a1b1589eea7272c80f44c495496ec59175758
[INFO] running `"docker" "start" "-a" "5718475b341b729402ebdb95a20a1b1589eea7272c80f44c495496ec59175758"`
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]     Checking serde_cbor v0.8.2
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking quickcheck v0.6.2
[INFO] [stderr]     Checking crossbeam-epoch v0.7.1
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking tokio-threadpool v0.1.14
[INFO] [stderr]     Checking tokio-fs v0.1.6
[INFO] [stderr]     Checking tokio v0.1.19
[INFO] [stderr]     Checking tokio-core v0.1.17
[INFO] [stderr]     Checking minnehack-check-in v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut client = Client::new_with_opts(
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:79:13
[INFO] [stderr]    |
[INFO] [stderr] 79 |         let mut client = Client::new_with_opts(
[INFO] [stderr]    |             ----^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.44s
[INFO] running `"docker" "inspect" "5718475b341b729402ebdb95a20a1b1589eea7272c80f44c495496ec59175758"`
[INFO] running `"docker" "rm" "-f" "5718475b341b729402ebdb95a20a1b1589eea7272c80f44c495496ec59175758"`
[INFO] [stdout] 5718475b341b729402ebdb95a20a1b1589eea7272c80f44c495496ec59175758