[INFO] crate acacia 0.1.2 is already in cache
[INFO] extracting crate acacia 0.1.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/acacia/0.1.2
[INFO] extracting crate acacia 0.1.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/acacia/0.1.2
[INFO] validating manifest of acacia-0.1.2 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 acacia-0.1.2 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 acacia-0.1.2
[INFO] finished frobbing acacia-0.1.2
[INFO] frobbed toml for acacia-0.1.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/acacia/0.1.2/Cargo.toml
[INFO] started frobbing acacia-0.1.2
[INFO] finished frobbing acacia-0.1.2
[INFO] frobbed toml for acacia-0.1.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/acacia/0.1.2/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 acacia-0.1.2 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/acacia/0.1.2:/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] d0f84d03caef71ba48cf94785a1a273c6f625a36650b71087b2abd4771efc4b6
[INFO] running `"docker" "start" "-a" "d0f84d03caef71ba48cf94785a1a273c6f625a36650b71087b2abd4771efc4b6"`
[INFO] [stderr]    Compiling nalgebra v0.10.1
[INFO] [stderr]    Compiling acacia v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]    --> src/partition/mod.rs:97:1
[INFO] [stderr]     |
[INFO] [stderr] 97  | / macro_rules! partition_quickcheck (
[INFO] [stderr] 98  | |     ($testfn: ident, $p: ty, $t: ty) => (
[INFO] [stderr] 99  | |         mod $testfn {
[INFO] [stderr] 100 | |             use $crate::partition::{
[INFO] [stderr] ...   |
[INFO] [stderr] 122 | |     )
[INFO] [stderr] 123 | | );
[INFO] [stderr]     | |__^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.20s
[INFO] running `"docker" "inspect" "d0f84d03caef71ba48cf94785a1a273c6f625a36650b71087b2abd4771efc4b6"`
[INFO] running `"docker" "rm" "-f" "d0f84d03caef71ba48cf94785a1a273c6f625a36650b71087b2abd4771efc4b6"`
[INFO] [stdout] d0f84d03caef71ba48cf94785a1a273c6f625a36650b71087b2abd4771efc4b6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/acacia/0.1.2:/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] a5b19eae0121940e0575bf5f05f8ef9796fac0060036b2a1eb4b4da860761d64
[INFO] running `"docker" "start" "-a" "a5b19eae0121940e0575bf5f05f8ef9796fac0060036b2a1eb4b4da860761d64"`
[INFO] [stderr]    Compiling acacia v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:4:19
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(test, feature(test))]
[INFO] [stderr]   |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]   --> src/partition/unitquad.rs:87:13
[INFO] [stderr]    |
[INFO] [stderr] 87 |         use rand::Rng;
[INFO] [stderr]    |             ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Node`
[INFO] [stderr]    --> src/data_tree.rs:148:29
[INFO] [stderr]     |
[INFO] [stderr] 148 |     use traits::{NodeState, Node, Positioned};
[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 `acacia`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a5b19eae0121940e0575bf5f05f8ef9796fac0060036b2a1eb4b4da860761d64"`
[INFO] running `"docker" "rm" "-f" "a5b19eae0121940e0575bf5f05f8ef9796fac0060036b2a1eb4b4da860761d64"`
[INFO] [stdout] a5b19eae0121940e0575bf5f05f8ef9796fac0060036b2a1eb4b4da860761d64