[INFO] updating cached repository LeakyBucket/app_therapy
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LeakyBucket/app_therapy
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LeakyBucket/app_therapy" "work/ex/beta-1.38-1/sources/1.37.0/gh/LeakyBucket/app_therapy"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/LeakyBucket/app_therapy'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LeakyBucket/app_therapy" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LeakyBucket/app_therapy"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LeakyBucket/app_therapy'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a6bb7682af6c9427838a05f1f917439603b1bc8c
[INFO] sha for GitHub repo LeakyBucket/app_therapy: a6bb7682af6c9427838a05f1f917439603b1bc8c
[INFO] validating manifest of LeakyBucket/app_therapy 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 LeakyBucket/app_therapy 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 LeakyBucket/app_therapy
[INFO] finished frobbing LeakyBucket/app_therapy
[INFO] frobbed toml for LeakyBucket/app_therapy written to work/ex/beta-1.38-1/sources/1.37.0/gh/LeakyBucket/app_therapy/Cargo.toml
[INFO] started frobbing LeakyBucket/app_therapy
[INFO] finished frobbing LeakyBucket/app_therapy
[INFO] frobbed toml for LeakyBucket/app_therapy written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/LeakyBucket/app_therapy/Cargo.toml
[INFO] crate LeakyBucket/app_therapy 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 LeakyBucket/app_therapy 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-5/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/LeakyBucket/app_therapy:/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] 5e11f860f67d467f3cdff52c61518b0a100fc2fe82056cb04c885229cf044b86
[INFO] running `"docker" "start" "-a" "5e11f860f67d467f3cdff52c61518b0a100fc2fe82056cb04c885229cf044b86"`
[INFO] [stderr]    Compiling phf_shared v0.7.19
[INFO] [stderr]    Compiling md5 v0.2.1
[INFO] [stderr]    Compiling libsodium-sys v0.0.12
[INFO] [stderr]    Compiling serde_derive v0.8.19
[INFO] [stderr]    Compiling docopt v0.6.86
[INFO] [stderr]    Compiling postgres-protocol v0.1.1
[INFO] [stderr]    Compiling phf v0.7.19
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/crater/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" "5e11f860f67d467f3cdff52c61518b0a100fc2fe82056cb04c885229cf044b86"`
[INFO] running `"docker" "rm" "-f" "5e11f860f67d467f3cdff52c61518b0a100fc2fe82056cb04c885229cf044b86"`
[INFO] [stdout] 5e11f860f67d467f3cdff52c61518b0a100fc2fe82056cb04c885229cf044b86