[INFO] updating cached repository dbeck/tcp-echo-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dbeck/tcp-echo-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dbeck/tcp-echo-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dbeck/tcp-echo-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dbeck/tcp-echo-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dbeck/tcp-echo-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bb4c07335482d0063fba3f0cc7d41d32a46f510b
[INFO] sha for GitHub repo dbeck/tcp-echo-rs: bb4c07335482d0063fba3f0cc7d41d32a46f510b
[INFO] validating manifest of dbeck/tcp-echo-rs on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dbeck/tcp-echo-rs on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dbeck/tcp-echo-rs
[INFO] finished frobbing dbeck/tcp-echo-rs
[INFO] frobbed toml for dbeck/tcp-echo-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs/Cargo.toml
[INFO] started frobbing dbeck/tcp-echo-rs
[INFO] finished frobbing dbeck/tcp-echo-rs
[INFO] frobbed toml for dbeck/tcp-echo-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dbeck/tcp-echo-rs/Cargo.toml
[INFO] crate dbeck/tcp-echo-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs/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[INFO] the lockfile is outdated, regenerating it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" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dbeck/tcp-echo-rs against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs:/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] cbc992652a402e85993762189468baf02e099a9fbcbbc25c627f0f55c99fe51a
[INFO] running `"docker" "start" "-a" "cbc992652a402e85993762189468baf02e099a9fbcbbc25c627f0f55c99fe51a"`
[INFO] [stderr]    Compiling lossyq v0.1.19
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling acto-rs v0.4.0
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling tcp-echo v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `channel_id`
[INFO] [stderr]   --> src/handle_parsed.rs:12:59
[INFO] [stderr]    |
[INFO] [stderr] 12 |     if let &mut ChannelWrapper::ConnectedReceiver(ref mut channel_id,
[INFO] [stderr]    |                                                           ^^^^^^^^^^ help: consider prefixing with an underscore: `_channel_id`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.25s
[INFO] running `"docker" "inspect" "cbc992652a402e85993762189468baf02e099a9fbcbbc25c627f0f55c99fe51a"`
[INFO] running `"docker" "rm" "-f" "cbc992652a402e85993762189468baf02e099a9fbcbbc25c627f0f55c99fe51a"`
[INFO] [stdout] cbc992652a402e85993762189468baf02e099a9fbcbbc25c627f0f55c99fe51a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs:/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=warn" "-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0622619d8f89c226ad2c5c1515a83beca21c29dff2499b62a0329d0e92c6d63f
[INFO] running `"docker" "start" "-a" "0622619d8f89c226ad2c5c1515a83beca21c29dff2499b62a0329d0e92c6d63f"`
[INFO] [stderr]    Compiling tcp-echo v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `channel_id`
[INFO] [stderr]   --> src/handle_parsed.rs:12:59
[INFO] [stderr]    |
[INFO] [stderr] 12 |     if let &mut ChannelWrapper::ConnectedReceiver(ref mut channel_id,
[INFO] [stderr]    |                                                           ^^^^^^^^^^ help: consider prefixing with an underscore: `_channel_id`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.94s
[INFO] running `"docker" "inspect" "0622619d8f89c226ad2c5c1515a83beca21c29dff2499b62a0329d0e92c6d63f"`
[INFO] running `"docker" "rm" "-f" "0622619d8f89c226ad2c5c1515a83beca21c29dff2499b62a0329d0e92c6d63f"`
[INFO] [stdout] 0622619d8f89c226ad2c5c1515a83beca21c29dff2499b62a0329d0e92c6d63f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dbeck/tcp-echo-rs:/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=warn" "-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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 1cfebd69509f16187c956ffb2de4eb91f112d8b1f54e62c85fc25bc2f081a4d2
[INFO] running `"docker" "start" "-a" "1cfebd69509f16187c956ffb2de4eb91f112d8b1f54e62c85fc25bc2f081a4d2"`
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tcp_echo-e8a6ac358d6dd896
[INFO] running `"docker" "inspect" "1cfebd69509f16187c956ffb2de4eb91f112d8b1f54e62c85fc25bc2f081a4d2"`
[INFO] running `"docker" "rm" "-f" "1cfebd69509f16187c956ffb2de4eb91f112d8b1f54e62c85fc25bc2f081a4d2"`
[INFO] [stdout] 1cfebd69509f16187c956ffb2de4eb91f112d8b1f54e62c85fc25bc2f081a4d2