[INFO] updating cached repository dragman/chat
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dragman/chat
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dragman/chat" "work/ex/beta-1.38-1/sources/1.37.0/gh/dragman/chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/dragman/chat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dragman/chat" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8d1f01b6f7dee43cb4875270829a25f54cede6cb
[INFO] sha for GitHub repo dragman/chat: 8d1f01b6f7dee43cb4875270829a25f54cede6cb
[INFO] validating manifest of dragman/chat 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 dragman/chat 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 dragman/chat
[INFO] finished frobbing dragman/chat
[INFO] frobbed toml for dragman/chat written to work/ex/beta-1.38-1/sources/1.37.0/gh/dragman/chat/Cargo.toml
[INFO] started frobbing dragman/chat
[INFO] finished frobbing dragman/chat
[INFO] frobbed toml for dragman/chat written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat/Cargo.toml
[INFO] crate dragman/chat 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dragman/chat against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 529d590a5c43566e5dada40f55cd9264f1cf56a37b7018c7b7a4edc85bdca78a
[INFO] running `"docker" "start" "-a" "529d590a5c43566e5dada40f55cd9264f1cf56a37b7018c7b7a4edc85bdca78a"`
[INFO] [stderr]    Compiling http-muncher v0.3.1
[INFO] [stderr]    Compiling sha1 v0.1.1
[INFO] [stderr]    Compiling mio v0.6.14
[INFO] [stderr]    Compiling chat v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:298:33
[INFO] [stderr]     |
[INFO] [stderr] 298 |                             let mut client = self.clients.get_mut(&token).unwrap();
[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 3.76s
[INFO] running `"docker" "inspect" "529d590a5c43566e5dada40f55cd9264f1cf56a37b7018c7b7a4edc85bdca78a"`
[INFO] running `"docker" "rm" "-f" "529d590a5c43566e5dada40f55cd9264f1cf56a37b7018c7b7a4edc85bdca78a"`
[INFO] [stdout] 529d590a5c43566e5dada40f55cd9264f1cf56a37b7018c7b7a4edc85bdca78a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] cff8a15048223c9123bda11e2c0db30507be876c4b9142d3bcd168ff0e666e04
[INFO] running `"docker" "start" "-a" "cff8a15048223c9123bda11e2c0db30507be876c4b9142d3bcd168ff0e666e04"`
[INFO] [stderr]    Compiling chat v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:298:33
[INFO] [stderr]     |
[INFO] [stderr] 298 |                             let mut client = self.clients.get_mut(&token).unwrap();
[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 0.95s
[INFO] running `"docker" "inspect" "cff8a15048223c9123bda11e2c0db30507be876c4b9142d3bcd168ff0e666e04"`
[INFO] running `"docker" "rm" "-f" "cff8a15048223c9123bda11e2c0db30507be876c4b9142d3bcd168ff0e666e04"`
[INFO] [stdout] cff8a15048223c9123bda11e2c0db30507be876c4b9142d3bcd168ff0e666e04
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dragman/chat:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] dec0beec83e51be550cd45bace44671e4a6edda1e59edfb1ad07b400d1f14bbe
[INFO] running `"docker" "start" "-a" "dec0beec83e51be550cd45bace44671e4a6edda1e59edfb1ad07b400d1f14bbe"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/chat-3e6a68d3079036ad
[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] running `"docker" "inspect" "dec0beec83e51be550cd45bace44671e4a6edda1e59edfb1ad07b400d1f14bbe"`
[INFO] running `"docker" "rm" "-f" "dec0beec83e51be550cd45bace44671e4a6edda1e59edfb1ad07b400d1f14bbe"`
[INFO] [stdout] dec0beec83e51be550cd45bace44671e4a6edda1e59edfb1ad07b400d1f14bbe