[INFO] fetching crate rbtree 0.1.5...
[INFO] checking rbtree-0.1.5 against try#894d32a5432c6a6461bb2aac7c3d5f2e87dce83f for pr-77015
[INFO] extracting crate rbtree 0.1.5 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate rbtree 0.1.5 on toolchain 894d32a5432c6a6461bb2aac7c3d5f2e87dce83f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rbtree 0.1.5
[INFO] finished tweaking crates.io crate rbtree 0.1.5
[INFO] tweaked toml for crates.io crate rbtree 0.1.5 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3f8ce4864443d68dd927bc780f3ed4d07b6de30607df2f95796908b43e2b269
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d3f8ce4864443d68dd927bc780f3ed4d07b6de30607df2f95796908b43e2b269", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3f8ce4864443d68dd927bc780f3ed4d07b6de30607df2f95796908b43e2b269", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3f8ce4864443d68dd927bc780f3ed4d07b6de30607df2f95796908b43e2b269", kill_on_drop: false }`
[INFO] [stdout] d3f8ce4864443d68dd927bc780f3ed4d07b6de30607df2f95796908b43e2b269
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+894d32a5432c6a6461bb2aac7c3d5f2e87dce83f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] af81bee8f9c70bed774e8e8e66a3544e0660ef92602824ea4dabbde755ce78cd
[INFO] running `Command { std: "docker" "start" "-a" "af81bee8f9c70bed774e8e8e66a3544e0660ef92602824ea4dabbde755ce78cd", kill_on_drop: false }`
[INFO] [stderr]     Checking rbtree v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:491:34
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:535:34
[INFO] [stdout]     |
[INFO] [stdout] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::RBTree`
[INFO] [stdout]     --> src/lib.rs:1404:9
[INFO] [stdout]      |
[INFO] [stdout] 1404 |     use super::RBTree;
[INFO] [stdout]      |         ^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:491:34
[INFO] [stdout]     |
[INFO] [stdout] 491 |     fn next(&mut self) -> Option<(&'a K)> {
[INFO] [stdout]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:535:34
[INFO] [stdout]     |
[INFO] [stdout] 535 |     fn next(&mut self) -> Option<(&'a V)> {
[INFO] [stdout]     |                                  ^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/lib.rs:581:34
[INFO] [stdout]     |
[INFO] [stdout] 581 |     fn next(&mut self) -> Option<(&'a mut V)> {
[INFO] [stdout]     |                                  ^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.06s
[INFO] running `Command { std: "docker" "inspect" "af81bee8f9c70bed774e8e8e66a3544e0660ef92602824ea4dabbde755ce78cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af81bee8f9c70bed774e8e8e66a3544e0660ef92602824ea4dabbde755ce78cd", kill_on_drop: false }`
[INFO] [stdout] af81bee8f9c70bed774e8e8e66a3544e0660ef92602824ea4dabbde755ce78cd