[INFO] fetching crate better_btree 0.2.6...
[INFO] checking better_btree-0.2.6 against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] extracting crate better_btree 0.2.6 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate better_btree 0.2.6 on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "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-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f296f06e33b73be6be9c4addce4ef81adeb148cf342367479946e4054d6e8186
[INFO] running `Command { std: "docker" "start" "-a" "f296f06e33b73be6be9c4addce4ef81adeb148cf342367479946e4054d6e8186", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f296f06e33b73be6be9c4addce4ef81adeb148cf342367479946e4054d6e8186", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f296f06e33b73be6be9c4addce4ef81adeb148cf342367479946e4054d6e8186", kill_on_drop: false }`
[INFO] [stdout] f296f06e33b73be6be9c4addce4ef81adeb148cf342367479946e4054d6e8186
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c652cd8d4f9fe291fa4b4bec11721a70c236b9040460b70a485ef398412a51b8
[INFO] running `Command { std: "docker" "start" "-a" "c652cd8d4f9fe291fa4b4bec11721a70c236b9040460b70a485ef398412a51b8", kill_on_drop: false }`
[INFO] [stderr]     Checking better_btree v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `deref_mut` is never used
[INFO] [stdout]    --> src/node_ref.rs:243:9
[INFO] [stdout]     |
[INFO] [stdout] 237 | impl<'a, K, V> NodeRef<K, V, marker::Owned, marker::LeafNode> {
[INFO] [stdout]     | ------------------------------------------------------------- method in this implementation
[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: method `deref_mut` is never used
[INFO] [stdout]    --> src/node_ref.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 249 | impl<'a, K, V> NodeRef<K, V, marker::Owned, marker::InternalNode> {
[INFO] [stdout]     | ----------------------------------------------------------------- method in this implementation
[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: method `deref` is never used
[INFO] [stdout]    --> src/node_ref.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 275 | impl<'a, K, V> NodeRef<K, V, marker::Mut<'a>, marker::LeafNode> {
[INFO] [stdout]     | --------------------------------------------------------------- method in this implementation
[INFO] [stdout] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `deref` is never used
[INFO] [stdout]    --> src/node_ref.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 287 | impl<'a, K, V> NodeRef<K, V, marker::Mut<'a>, marker::InternalNode> {
[INFO] [stdout]     | ------------------------------------------------------------------- method in this implementation
[INFO] [stdout] 288 |     pub fn deref(&self) -> &'a InternalNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `deref_mut` is never used
[INFO] [stdout]    --> src/node_ref.rs:243:9
[INFO] [stdout]     |
[INFO] [stdout] 237 | impl<'a, K, V> NodeRef<K, V, marker::Owned, marker::LeafNode> {
[INFO] [stdout]     | ------------------------------------------------------------- method in this implementation
[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: method `deref_mut` is never used
[INFO] [stdout]    --> src/node_ref.rs:255:9
[INFO] [stdout]     |
[INFO] [stdout] 249 | impl<'a, K, V> NodeRef<K, V, marker::Owned, marker::InternalNode> {
[INFO] [stdout]     | ----------------------------------------------------------------- method in this implementation
[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: method `deref` is never used
[INFO] [stdout]    --> src/node_ref.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 275 | impl<'a, K, V> NodeRef<K, V, marker::Mut<'a>, marker::LeafNode> {
[INFO] [stdout]     | --------------------------------------------------------------- method in this implementation
[INFO] [stdout] 276 |     pub fn deref(&self) -> &'a LeafNode<K, V> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `deref` is never used
[INFO] [stdout]    --> src/node_ref.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 287 | impl<'a, K, V> NodeRef<K, V, marker::Mut<'a>, marker::InternalNode> {
[INFO] [stdout]     | ------------------------------------------------------------------- method in this implementation
[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: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "c652cd8d4f9fe291fa4b4bec11721a70c236b9040460b70a485ef398412a51b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c652cd8d4f9fe291fa4b4bec11721a70c236b9040460b70a485ef398412a51b8", kill_on_drop: false }`
[INFO] [stdout] c652cd8d4f9fe291fa4b4bec11721a70c236b9040460b70a485ef398412a51b8