[INFO] crate seq-macro 0.1.4 is already in cache
[INFO] extracting crate seq-macro 0.1.4 into work/ex/beta-1.37-6/sources/1.36.0/reg/seq-macro/0.1.4
[INFO] extracting crate seq-macro 0.1.4 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/seq-macro/0.1.4
[INFO] validating manifest of seq-macro-0.1.4 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 seq-macro-0.1.4 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 seq-macro-0.1.4
[INFO] finished frobbing seq-macro-0.1.4
[INFO] frobbed toml for seq-macro-0.1.4 written to work/ex/beta-1.37-6/sources/1.36.0/reg/seq-macro/0.1.4/Cargo.toml
[INFO] started frobbing seq-macro-0.1.4
[INFO] finished frobbing seq-macro-0.1.4
[INFO] frobbed toml for seq-macro-0.1.4 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/seq-macro/0.1.4/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] testing seq-macro-0.1.4 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-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/seq-macro/0.1.4:/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] d7043fecc58e14cfe4fbec556de6c56c13ff5236bdf65f92d465cbbfc475c72e
[INFO] running `"docker" "start" "-a" "d7043fecc58e14cfe4fbec556de6c56c13ff5236bdf65f92d465cbbfc475c72e"`
[INFO] [stderr]    Compiling seq-macro v0.1.4 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.14s
[INFO] running `"docker" "inspect" "d7043fecc58e14cfe4fbec556de6c56c13ff5236bdf65f92d465cbbfc475c72e"`
[INFO] running `"docker" "rm" "-f" "d7043fecc58e14cfe4fbec556de6c56c13ff5236bdf65f92d465cbbfc475c72e"`
[INFO] [stdout] d7043fecc58e14cfe4fbec556de6c56c13ff5236bdf65f92d465cbbfc475c72e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/seq-macro/0.1.4:/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] d9c9b82efdeb566ee8982ed867da4d4061b90deb53cbb37f7218aeaaf2b7a67e
[INFO] running `"docker" "start" "-a" "d9c9b82efdeb566ee8982ed867da4d4061b90deb53cbb37f7218aeaaf2b7a67e"`
[INFO] [stderr]    Compiling seq-macro v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> tests/test_group.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(proc_macro_hygiene)]
[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 `seq-macro`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "d9c9b82efdeb566ee8982ed867da4d4061b90deb53cbb37f7218aeaaf2b7a67e"`
[INFO] running `"docker" "rm" "-f" "d9c9b82efdeb566ee8982ed867da4d4061b90deb53cbb37f7218aeaaf2b7a67e"`
[INFO] [stdout] d9c9b82efdeb566ee8982ed867da4d4061b90deb53cbb37f7218aeaaf2b7a67e