[INFO] crate serde-pickle 0.5.0 is already in cache
[INFO] extracting crate serde-pickle 0.5.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/serde-pickle/0.5.0
[INFO] extracting crate serde-pickle 0.5.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde-pickle/0.5.0
[INFO] validating manifest of serde-pickle-0.5.0 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 serde-pickle-0.5.0 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 serde-pickle-0.5.0
[INFO] finished frobbing serde-pickle-0.5.0
[INFO] frobbed toml for serde-pickle-0.5.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/serde-pickle/0.5.0/Cargo.toml
[INFO] started frobbing serde-pickle-0.5.0
[INFO] finished frobbing serde-pickle-0.5.0
[INFO] frobbed toml for serde-pickle-0.5.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/serde-pickle/0.5.0/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] [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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing serde-pickle-0.5.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/serde-pickle/0.5.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] e99a9f997f442c8c365f120fbbb80982442b382208283e13e96a2fec7421ced5
[INFO] running `"docker" "start" "-a" "e99a9f997f442c8c365f120fbbb80982442b382208283e13e96a2fec7421ced5"`
[INFO] [stderr]    Compiling iter-read v0.2.0
[INFO] [stderr]    Compiling num-bigint v0.2.2
[INFO] [stderr]    Compiling serde-pickle v0.5.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.87s
[INFO] running `"docker" "inspect" "e99a9f997f442c8c365f120fbbb80982442b382208283e13e96a2fec7421ced5"`
[INFO] running `"docker" "rm" "-f" "e99a9f997f442c8c365f120fbbb80982442b382208283e13e96a2fec7421ced5"`
[INFO] [stdout] e99a9f997f442c8c365f120fbbb80982442b382208283e13e96a2fec7421ced5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/serde-pickle/0.5.0:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 4262b50eee55e06b735822dd2f9ad3f8867dbee054ba5250c94cf5d8e3015d05
[INFO] running `"docker" "start" "-a" "4262b50eee55e06b735822dd2f9ad3f8867dbee054ba5250c94cf5d8e3015d05"`
[INFO] [stderr]    Compiling env_logger v0.6.2
[INFO] [stderr]    Compiling quickcheck v0.8.5
[INFO] [stderr]    Compiling serde-pickle v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:53:19
[INFO] [stderr]    |
[INFO] [stderr] 53 | #![cfg_attr(test, feature(test))]
[INFO] [stderr]    |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `serde-pickle`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "4262b50eee55e06b735822dd2f9ad3f8867dbee054ba5250c94cf5d8e3015d05"`
[INFO] running `"docker" "rm" "-f" "4262b50eee55e06b735822dd2f9ad3f8867dbee054ba5250c94cf5d8e3015d05"`
[INFO] [stdout] 4262b50eee55e06b735822dd2f9ad3f8867dbee054ba5250c94cf5d8e3015d05