[INFO] fetching crate rctree 0.3.3...
[INFO] extracting crate rctree 0.3.3 into work/ex/beta-1.37-6/sources/1.36.0/reg/rctree/0.3.3
[INFO] extracting crate rctree 0.3.3 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rctree/0.3.3
[INFO] validating manifest of rctree-0.3.3 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 rctree-0.3.3 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 rctree-0.3.3
[INFO] finished frobbing rctree-0.3.3
[INFO] frobbed toml for rctree-0.3.3 written to work/ex/beta-1.37-6/sources/1.36.0/reg/rctree/0.3.3/Cargo.toml
[INFO] started frobbing rctree-0.3.3
[INFO] finished frobbing rctree-0.3.3
[INFO] frobbed toml for rctree-0.3.3 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rctree/0.3.3/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] [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" "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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing rctree-0.3.3 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rctree/0.3.3:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 377ce276d96facdf18dfe50e0635f894b66df9665657356d1a465aed95dc93de
[INFO] running `"docker" "start" "-a" "377ce276d96facdf18dfe50e0635f894b66df9665657356d1a465aed95dc93de"`
[INFO] [stderr]    Compiling rctree v0.3.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.28s
[INFO] running `"docker" "inspect" "377ce276d96facdf18dfe50e0635f894b66df9665657356d1a465aed95dc93de"`
[INFO] running `"docker" "rm" "-f" "377ce276d96facdf18dfe50e0635f894b66df9665657356d1a465aed95dc93de"`
[INFO] [stdout] 377ce276d96facdf18dfe50e0635f894b66df9665657356d1a465aed95dc93de
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rctree/0.3.3:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] a566680d74c5ce03504e22401faf5bea1c75d8b7573fb6053c278bd6d959c463
[INFO] running `"docker" "start" "-a" "a566680d74c5ce03504e22401faf5bea1c75d8b7573fb6053c278bd6d959c463"`
[INFO] [stderr]    Compiling rctree v0.3.3 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.28s
[INFO] running `"docker" "inspect" "a566680d74c5ce03504e22401faf5bea1c75d8b7573fb6053c278bd6d959c463"`
[INFO] running `"docker" "rm" "-f" "a566680d74c5ce03504e22401faf5bea1c75d8b7573fb6053c278bd6d959c463"`
[INFO] [stdout] a566680d74c5ce03504e22401faf5bea1c75d8b7573fb6053c278bd6d959c463
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/rctree/0.3.3:/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-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 91ac7a6fe391e4905ad9ff7410c1fb9ff35a4e0d5d5c446abb6f3a88fb69f25e
[INFO] running `"docker" "start" "-a" "91ac7a6fe391e4905ad9ff7410c1fb9ff35a4e0d5d5c446abb6f3a88fb69f25e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rctree-a513e5092c97d7ef
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/tests-4536b2d5d135bd1a
[INFO] [stdout] 
[INFO] [stdout] running 19 tests
[INFO] [stdout] test children_2 ... ok
[INFO] [stdout] test children_1 ... ok
[INFO] [stdout] test it_works ... ok
[INFO] [stdout] test root_1 ... ok
[INFO] [stdout] test make_deep_copy_1 ... ok
[INFO] [stdout] test make_copy_1 ... ok
[INFO] [stdout] test root_4 ... ok
[INFO] [stdout] test root_3 ... ok
[INFO] [stdout] test root_2 ... ok
[INFO] [stdout] test traverse_2 ... ok
[INFO] [stdout] test weak_1 ... ok
[INFO] [stdout] test weak_2 ... ok
[INFO] [stdout] test traverse_1 ... ok
[INFO] [stdout] test append_1 ... ok
[INFO] [stdout] test insert_before_1 ... ok
[INFO] [stdout] test insert_after_1 ... ok
[INFO] [stdout] test prepend_1 ... ok
[INFO] [stdout] test iter_1 ... ok
[INFO] [stdout] test stack_overflow ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rctree
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "91ac7a6fe391e4905ad9ff7410c1fb9ff35a4e0d5d5c446abb6f3a88fb69f25e"`
[INFO] running `"docker" "rm" "-f" "91ac7a6fe391e4905ad9ff7410c1fb9ff35a4e0d5d5c446abb6f3a88fb69f25e"`
[INFO] [stdout] 91ac7a6fe391e4905ad9ff7410c1fb9ff35a4e0d5d5c446abb6f3a88fb69f25e