[INFO] updating cached repository CrimsonAndRed/MyLittleTree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/CrimsonAndRed/MyLittleTree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/CrimsonAndRed/MyLittleTree" "work/ex/beta-1.37-6/sources/1.36.0/gh/CrimsonAndRed/MyLittleTree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/CrimsonAndRed/MyLittleTree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/CrimsonAndRed/MyLittleTree" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 78579106ceda8e62514cfb157392a5c603b54fdf
[INFO] sha for GitHub repo CrimsonAndRed/MyLittleTree: 78579106ceda8e62514cfb157392a5c603b54fdf
[INFO] validating manifest of CrimsonAndRed/MyLittleTree 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 CrimsonAndRed/MyLittleTree 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 CrimsonAndRed/MyLittleTree
[INFO] finished frobbing CrimsonAndRed/MyLittleTree
[INFO] frobbed toml for CrimsonAndRed/MyLittleTree written to work/ex/beta-1.37-6/sources/1.36.0/gh/CrimsonAndRed/MyLittleTree/Cargo.toml
[INFO] started frobbing CrimsonAndRed/MyLittleTree
[INFO] finished frobbing CrimsonAndRed/MyLittleTree
[INFO] frobbed toml for CrimsonAndRed/MyLittleTree written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree/Cargo.toml
[INFO] crate CrimsonAndRed/MyLittleTree already has a lockfile, it will not be regenerated
[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] testing CrimsonAndRed/MyLittleTree 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-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree:/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] 133d38fca13fb2b08d0f91c31267dee308c3b54e0b2e86485e0792cecdcd79a3
[INFO] running `"docker" "start" "-a" "133d38fca13fb2b08d0f91c31267dee308c3b54e0b2e86485e0792cecdcd79a3"`
[INFO] [stderr]    Compiling my_little_tree v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/lib.rs:108:27
[INFO] [stderr]     |
[INFO] [stderr] 102 |         match &self.root {
[INFO] [stderr]     |               ---------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 108 |             Some(link) => self.inner_insert(new_node, Rc::clone(&link)),
[INFO] [stderr]     |                           ^^^^ mutable borrow occurs here       ----- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `"docker" "inspect" "133d38fca13fb2b08d0f91c31267dee308c3b54e0b2e86485e0792cecdcd79a3"`
[INFO] running `"docker" "rm" "-f" "133d38fca13fb2b08d0f91c31267dee308c3b54e0b2e86485e0792cecdcd79a3"`
[INFO] [stdout] 133d38fca13fb2b08d0f91c31267dee308c3b54e0b2e86485e0792cecdcd79a3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree:/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] ed959adc618f980caae1c827c7a9ca96930ed32f1d641448185f18a48623b6a2
[INFO] running `"docker" "start" "-a" "ed959adc618f980caae1c827c7a9ca96930ed32f1d641448185f18a48623b6a2"`
[INFO] [stderr]    Compiling my_little_tree v1.0.0 (/opt/crater/workdir)
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/lib.rs:108:27
[INFO] [stderr]     |
[INFO] [stderr] 102 |         match &self.root {
[INFO] [stderr]     |               ---------- immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 108 |             Some(link) => self.inner_insert(new_node, Rc::clone(&link)),
[INFO] [stderr]     |                           ^^^^ mutable borrow occurs here       ----- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(mutable_borrow_reservation_conflict)] on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `"docker" "inspect" "ed959adc618f980caae1c827c7a9ca96930ed32f1d641448185f18a48623b6a2"`
[INFO] running `"docker" "rm" "-f" "ed959adc618f980caae1c827c7a9ca96930ed32f1d641448185f18a48623b6a2"`
[INFO] [stdout] ed959adc618f980caae1c827c7a9ca96930ed32f1d641448185f18a48623b6a2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/CrimsonAndRed/MyLittleTree:/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] 9183d71398bc30198a9617de68d6c7b884e6a93598cdd971108c54cf61ae99ac
[INFO] running `"docker" "start" "-a" "9183d71398bc30198a9617de68d6c7b884e6a93598cdd971108c54cf61ae99ac"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/my_little_tree-f0d4ee9c4d9127d0
[INFO] [stdout] 
[INFO] [stdout] running 17 tests
[INFO] [stdout] test tests::delete_miss ... ok
[INFO] [stdout] test tests::delete_node_both_l_diff ... ok
[INFO] [stdout] test tests::delete_find ... ok
[INFO] [stdout] test tests::delete_node_both_l_same ... ok
[INFO] [stdout] test tests::delete_node_both_r_same ... ok
[INFO] [stdout] test tests::delete_node_both_r_diff ... ok
[INFO] [stdout] test tests::delete_root_l ... ok
[INFO] [stdout] test tests::delete_root_none ... ok
[INFO] [stdout] test tests::delete_root_r ... ok
[INFO] [stdout] test tests::delete_root_both_same ... ok
[INFO] [stdout] test tests::delete_root_both_diff ... ok
[INFO] [stdout] test tests::delete_node_none ... ok
[INFO] [stdout] test tests::delete_node_l ... ok
[INFO] [stdout] test tests::empty_tree ... ok
[INFO] [stdout] test tests::insert_find ... ok
[INFO] [stdout] test tests::iterate ... ok
[INFO] [stdout] test tests::delete_node_r ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 17 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests my_little_tree
[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" "9183d71398bc30198a9617de68d6c7b884e6a93598cdd971108c54cf61ae99ac"`
[INFO] running `"docker" "rm" "-f" "9183d71398bc30198a9617de68d6c7b884e6a93598cdd971108c54cf61ae99ac"`
[INFO] [stdout] 9183d71398bc30198a9617de68d6c7b884e6a93598cdd971108c54cf61ae99ac