[INFO] crate tokio-imap 0.4.0 is already in cache
[INFO] extracting crate tokio-imap 0.4.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/tokio-imap/0.4.0
[INFO] extracting crate tokio-imap 0.4.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tokio-imap/0.4.0
[INFO] validating manifest of tokio-imap-0.4.0 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of tokio-imap-0.4.0 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing tokio-imap-0.4.0
[INFO] finished frobbing tokio-imap-0.4.0
[INFO] frobbed toml for tokio-imap-0.4.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/tokio-imap/0.4.0/Cargo.toml
[INFO] started frobbing tokio-imap-0.4.0
[INFO] finished frobbing tokio-imap-0.4.0
[INFO] frobbed toml for tokio-imap-0.4.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tokio-imap/0.4.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing tokio-imap-0.4.0 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tokio-imap/0.4.0:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] d0613b3c55fb7707c2c44f705f7722f6c3e286d595b8ab5d190d049118b01237
[INFO] running `"docker" "start" "-a" "d0613b3c55fb7707c2c44f705f7722f6c3e286d595b8ab5d190d049118b01237"`
[INFO] [stderr]    Compiling futures-state-stream v0.1.1
[INFO] [stderr]    Compiling imap-proto v0.6.0
[INFO] [stderr]    Compiling tokio-tls v0.2.1
[INFO] [stderr]    Compiling tokio-imap v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/client/mod.rs:133:18
[INFO] [stderr]     |
[INFO] [stderr] 133 |             Some(mut transport) => transport,
[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 4.42s
[INFO] running `"docker" "inspect" "d0613b3c55fb7707c2c44f705f7722f6c3e286d595b8ab5d190d049118b01237"`
[INFO] running `"docker" "rm" "-f" "d0613b3c55fb7707c2c44f705f7722f6c3e286d595b8ab5d190d049118b01237"`
[INFO] [stdout] d0613b3c55fb7707c2c44f705f7722f6c3e286d595b8ab5d190d049118b01237
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tokio-imap/0.4.0:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 17e798f35d3d3ffc1a04352da406bb35aef94da9ebc778404d998cc8dedfce6f
[INFO] running `"docker" "start" "-a" "17e798f35d3d3ffc1a04352da406bb35aef94da9ebc778404d998cc8dedfce6f"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling tokio-imap v0.4.0 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> examples/basic.rs:95:32
[INFO] [stderr]    |
[INFO] [stderr] 95 |     fn cause(&self) -> Option<&Error> {
[INFO] [stderr]    |                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/client/mod.rs:133:18
[INFO] [stderr]     |
[INFO] [stderr] 133 |             Some(mut transport) => transport,
[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 2.96s
[INFO] running `"docker" "inspect" "17e798f35d3d3ffc1a04352da406bb35aef94da9ebc778404d998cc8dedfce6f"`
[INFO] running `"docker" "rm" "-f" "17e798f35d3d3ffc1a04352da406bb35aef94da9ebc778404d998cc8dedfce6f"`
[INFO] [stdout] 17e798f35d3d3ffc1a04352da406bb35aef94da9ebc778404d998cc8dedfce6f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/tokio-imap/0.4.0:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 96809868f04630c864ecc40c4c86f45072d3fccdb4878645ed062bc9db281eac
[INFO] running `"docker" "start" "-a" "96809868f04630c864ecc40c4c86f45072d3fccdb4878645ed062bc9db281eac"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tokio_imap-a640b47e41613832
[INFO] [stderr]    Doc-tests tokio-imap
[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] [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" "96809868f04630c864ecc40c4c86f45072d3fccdb4878645ed062bc9db281eac"`
[INFO] running `"docker" "rm" "-f" "96809868f04630c864ecc40c4c86f45072d3fccdb4878645ed062bc9db281eac"`
[INFO] [stdout] 96809868f04630c864ecc40c4c86f45072d3fccdb4878645ed062bc9db281eac