[INFO] fetching crate better_btree 0.2.6...
[INFO] testing better_btree-0.2.6 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate better_btree 0.2.6 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate better_btree 0.2.6 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate better_btree 0.2.6
[INFO] finished tweaking crates.io crate better_btree 0.2.6
[INFO] tweaked toml for crates.io crate better_btree 0.2.6 written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04b67159a88eca78162955c1cf1d4c389360636bcb330d8f6127c77b9b7a742c
[INFO] running `Command { std: "docker" "start" "-a" "04b67159a88eca78162955c1cf1d4c389360636bcb330d8f6127c77b9b7a742c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04b67159a88eca78162955c1cf1d4c389360636bcb330d8f6127c77b9b7a742c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04b67159a88eca78162955c1cf1d4c389360636bcb330d8f6127c77b9b7a742c", kill_on_drop: false }`
[INFO] [stdout] 04b67159a88eca78162955c1cf1d4c389360636bcb330d8f6127c77b9b7a742c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9632a9f232a6833490da83eda60845775090e9832d96a4cee4cc93356b61876
[INFO] running `Command { std: "docker" "start" "-a" "e9632a9f232a6833490da83eda60845775090e9832d96a4cee4cc93356b61876", kill_on_drop: false }`
[INFO] [stderr]    Compiling better_btree v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:243:9
[INFO] [stdout]     |
[INFO] [stdout] 243 |     pub fn deref_mut(&mut self) -> &'a mut LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 255 |     pub fn deref_mut(&mut self) -> &'a mut InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |     pub fn deref(&self) -> &'a InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.79s
[INFO] running `Command { std: "docker" "inspect" "e9632a9f232a6833490da83eda60845775090e9832d96a4cee4cc93356b61876", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9632a9f232a6833490da83eda60845775090e9832d96a4cee4cc93356b61876", kill_on_drop: false }`
[INFO] [stdout] e9632a9f232a6833490da83eda60845775090e9832d96a4cee4cc93356b61876
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 52b34ccefd424d6be700921b4fa98af83345cfa2b89b96569546f9ef9c043ea4
[INFO] running `Command { std: "docker" "start" "-a" "52b34ccefd424d6be700921b4fa98af83345cfa2b89b96569546f9ef9c043ea4", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:243:9
[INFO] [stdout]     |
[INFO] [stdout] 243 |     pub fn deref_mut(&mut self) -> &'a mut LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 255 |     pub fn deref_mut(&mut self) -> &'a mut InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling better_btree v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |     pub fn deref(&self) -> &'a InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:243:9
[INFO] [stdout]     |
[INFO] [stdout] 243 |     pub fn deref_mut(&mut self) -> &'a mut LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref_mut`
[INFO] [stdout]    --> src/node_ref.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 255 |     pub fn deref_mut(&mut self) -> &'a mut InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `deref`
[INFO] [stdout]    --> src/node_ref.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |     pub fn deref(&self) -> &'a InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.53s
[INFO] [stderr]   Executable unittests src/lib.rs (/opt/rustwide/target/debug/deps/better_btree-3777f90f5b28d683)
[INFO] running `Command { std: "docker" "inspect" "52b34ccefd424d6be700921b4fa98af83345cfa2b89b96569546f9ef9c043ea4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52b34ccefd424d6be700921b4fa98af83345cfa2b89b96569546f9ef9c043ea4", kill_on_drop: false }`
[INFO] [stdout] 52b34ccefd424d6be700921b4fa98af83345cfa2b89b96569546f9ef9c043ea4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4f732010bffa08b4f879246a6799fdbe8d29d967cece59c5a49cdd940262452c
[INFO] running `Command { std: "docker" "start" "-a" "4f732010bffa08b4f879246a6799fdbe8d29d967cece59c5a49cdd940262452c", kill_on_drop: false }`
[INFO] [stderr] warning: associated function is never used: `deref_mut`
[INFO] [stderr]    --> src/node_ref.rs:243:9
[INFO] [stderr]     |
[INFO] [stderr] 243 |     pub fn deref_mut(&mut self) -> &'a mut LeafNode<K, V> {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `deref_mut`
[INFO] [stderr]    --> src/node_ref.rs:255:9
[INFO] [stderr]     |
[INFO] [stderr] 255 |     pub fn deref_mut(&mut self) -> &'a mut InternalNode<K, V> {
[INFO] [stderr]     |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `deref`
[INFO] [stderr]    --> src/node_ref.rs:276:9
[INFO] [stderr]     |
[INFO] [stderr] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `deref`
[INFO] [stderr]    --> src/node_ref.rs:288:9
[INFO] [stderr]     |
[INFO] [stderr] 288 |     pub fn deref(&self) -> &'a InternalNode<K, V> {
[INFO] [stderr]     |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `better_btree` (lib) generated 4 warnings
[INFO] [stderr] warning: `better_btree` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/better_btree-3777f90f5b28d683)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests better_btree
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4f732010bffa08b4f879246a6799fdbe8d29d967cece59c5a49cdd940262452c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f732010bffa08b4f879246a6799fdbe8d29d967cece59c5a49cdd940262452c", kill_on_drop: false }`
[INFO] [stdout] 4f732010bffa08b4f879246a6799fdbe8d29d967cece59c5a49cdd940262452c