[INFO] crate json-trait-rs 0.3.0 is already in cache
[INFO] extracting crate json-trait-rs 0.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/json-trait-rs/0.3.0
[INFO] extracting crate json-trait-rs 0.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/json-trait-rs/0.3.0
[INFO] validating manifest of json-trait-rs-0.3.0 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 json-trait-rs-0.3.0 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 json-trait-rs-0.3.0
[INFO] finished frobbing json-trait-rs-0.3.0
[INFO] frobbed toml for json-trait-rs-0.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/json-trait-rs/0.3.0/Cargo.toml
[INFO] started frobbing json-trait-rs-0.3.0
[INFO] finished frobbing json-trait-rs-0.3.0
[INFO] frobbed toml for json-trait-rs-0.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/json-trait-rs/0.3.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 json-trait-rs-0.3.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/json-trait-rs/0.3.0:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] d59b7d947da802fc5ef7ba7dff7530ad5cf40f9a1725641635a6f43559967e69
[INFO] running `"docker" "start" "-a" "d59b7d947da802fc5ef7ba7dff7530ad5cf40f9a1725641635a6f43559967e69"`
[INFO] [stderr]    Compiling strum_macros v0.15.0
[INFO] [stderr]    Compiling json-trait-rs v0.3.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.91s
[INFO] running `"docker" "inspect" "d59b7d947da802fc5ef7ba7dff7530ad5cf40f9a1725641635a6f43559967e69"`
[INFO] running `"docker" "rm" "-f" "d59b7d947da802fc5ef7ba7dff7530ad5cf40f9a1725641635a6f43559967e69"`
[INFO] [stdout] d59b7d947da802fc5ef7ba7dff7530ad5cf40f9a1725641635a6f43559967e69
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/json-trait-rs/0.3.0:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8d68343915e85f1a9e18e76e7ca4b9a8df3048b72d0982c883cb99304a8b75ec
[INFO] running `"docker" "start" "-a" "8d68343915e85f1a9e18e76e7ca4b9a8df3048b72d0982c883cb99304a8b75ec"`
[INFO] [stderr]    Compiling test-case-derive v0.2.1
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/test-case-derive-0.2.1/src/lib.rs:214:1
[INFO] [stderr]     |
[INFO] [stderr] 214 | #![feature(proc_macro)]
[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 `test-case-derive`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "8d68343915e85f1a9e18e76e7ca4b9a8df3048b72d0982c883cb99304a8b75ec"`
[INFO] running `"docker" "rm" "-f" "8d68343915e85f1a9e18e76e7ca4b9a8df3048b72d0982c883cb99304a8b75ec"`
[INFO] [stdout] 8d68343915e85f1a9e18e76e7ca4b9a8df3048b72d0982c883cb99304a8b75ec