[INFO] updating cached repository https://github.com/colindjk/tin_can_telephone
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0d6aab22360302fce31f73fb36e612a9ad138f11
[INFO] testing colindjk/tin_can_telephone against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolindjk%2Ftin_can_telephone" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/colindjk/tin_can_telephone on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/colindjk/tin_can_telephone
[INFO] finished tweaking git repo https://github.com/colindjk/tin_can_telephone
[INFO] tweaked toml for git repo https://github.com/colindjk/tin_can_telephone written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/colindjk/tin_can_telephone already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 2f36f63e19f91aa22627d311aa73a102dad3fe630a95c04f764ee53e68127e11
[INFO] running `"docker" "start" "-a" "2f36f63e19f91aa22627d311aa73a102dad3fe630a95c04f764ee53e68127e11"`
[INFO] [stderr]    Compiling either v1.0.2
[INFO] [stderr]    Compiling serde v0.8.19
[INFO] [stderr]    Compiling net2 v0.2.26
[INFO] [stderr]    Compiling syn v0.10.3
[INFO] [stderr]    Compiling futures v0.1.6
[INFO] [stderr]    Compiling nix v0.7.0
[INFO] [stderr]    Compiling backtrace-sys v0.1.5
[INFO] [stderr]    Compiling regex v0.1.80
[INFO] [stderr]    Compiling backtrace v0.2.3
[INFO] [stderr]    Compiling error-chain v0.5.0
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.1
[INFO] [stderr]    Compiling env_logger v0.3.5
[INFO] [stderr]    Compiling serde_codegen v0.8.19
[INFO] [stderr]    Compiling mio v0.6.1
[INFO] [stderr]    Compiling serde_json v0.8.3
[INFO] [stderr]    Compiling serde_derive v0.8.19
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-0.8.19/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro, proc_macro_lib)]
[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_derive`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "2f36f63e19f91aa22627d311aa73a102dad3fe630a95c04f764ee53e68127e11"`
[INFO] running `"docker" "rm" "-f" "2f36f63e19f91aa22627d311aa73a102dad3fe630a95c04f764ee53e68127e11"`
[INFO] [stdout] 2f36f63e19f91aa22627d311aa73a102dad3fe630a95c04f764ee53e68127e11