[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-1.38-1/sources/1.37.0/gh/CrimsonAndRed/MyLittleTree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/CrimsonAndRed/MyLittleTree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/CrimsonAndRed/MyLittleTree" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/CrimsonAndRed/MyLittleTree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of CrimsonAndRed/MyLittleTree 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 CrimsonAndRed/MyLittleTree
[INFO] finished frobbing CrimsonAndRed/MyLittleTree
[INFO] frobbed toml for CrimsonAndRed/MyLittleTree written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 CrimsonAndRed/MyLittleTree 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 874cf29d01731a96040995ee3616bc5242e4e88858e101c9b49b1462f77dba39
[INFO] running `"docker" "start" "-a" "874cf29d01731a96040995ee3616bc5242e4e88858e101c9b49b1462f77dba39"`
[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 0.23s
[INFO] running `"docker" "inspect" "874cf29d01731a96040995ee3616bc5242e4e88858e101c9b49b1462f77dba39"`
[INFO] running `"docker" "rm" "-f" "874cf29d01731a96040995ee3616bc5242e4e88858e101c9b49b1462f77dba39"`
[INFO] [stdout] 874cf29d01731a96040995ee3616bc5242e4e88858e101c9b49b1462f77dba39
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 57c8085ba085f423f3b544a1e031a93e42f36835df0e5ba7864de8108b866d6c
[INFO] running `"docker" "start" "-a" "57c8085ba085f423f3b544a1e031a93e42f36835df0e5ba7864de8108b866d6c"`
[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 0.73s
[INFO] running `"docker" "inspect" "57c8085ba085f423f3b544a1e031a93e42f36835df0e5ba7864de8108b866d6c"`
[INFO] running `"docker" "rm" "-f" "57c8085ba085f423f3b544a1e031a93e42f36835df0e5ba7864de8108b866d6c"`
[INFO] [stdout] 57c8085ba085f423f3b544a1e031a93e42f36835df0e5ba7864de8108b866d6c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] e9fbb3741c7374a7b613f58378d58478361f59cb34a4cc579b5e97f920fb012a
[INFO] running `"docker" "start" "-a" "e9fbb3741c7374a7b613f58378d58478361f59cb34a4cc579b5e97f920fb012a"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/my_little_tree-57b484f9819aa293
[INFO] [stdout] 
[INFO] [stdout] running 17 tests
[INFO] [stdout] test tests::delete_node_both_r_diff ... ok
[INFO] [stdout] test tests::delete_node_both_l_same ... ok
[INFO] [stdout] test tests::delete_miss ... ok
[INFO] [stdout] test tests::delete_find ... ok
[INFO] [stdout] test tests::delete_node_r ... ok
[INFO] [stdout] test tests::delete_root_both_diff ... ok
[INFO] [stdout] test tests::delete_root_both_same ... 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::empty_tree ... ok
[INFO] [stdout] test tests::insert_find ... ok
[INFO] [stdout] test tests::delete_node_both_r_same ... ok
[INFO] [stdout] test tests::delete_node_none ... ok
[INFO] [stdout] test tests::delete_node_l ... ok
[INFO] [stdout] test tests::iterate ... ok
[INFO] [stdout] test tests::delete_node_both_l_diff ... 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" "e9fbb3741c7374a7b613f58378d58478361f59cb34a4cc579b5e97f920fb012a"`
[INFO] running `"docker" "rm" "-f" "e9fbb3741c7374a7b613f58378d58478361f59cb34a4cc579b5e97f920fb012a"`
[INFO] [stdout] e9fbb3741c7374a7b613f58378d58478361f59cb34a4cc579b5e97f920fb012a