[INFO] cloning repository https://github.com/mhn1991/BinaryTree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mhn1991/BinaryTree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhn1991%2FBinaryTree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhn1991%2FBinaryTree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7656902817f6da21bcc0d08e9f5b6266d92d2521
[INFO] documenting mhn1991/BinaryTree against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmhn1991%2FBinaryTree" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mhn1991/BinaryTree on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mhn1991/BinaryTree
[INFO] finished tweaking git repo https://github.com/mhn1991/BinaryTree
[INFO] tweaked toml for git repo https://github.com/mhn1991/BinaryTree written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/mhn1991/BinaryTree already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded typed-arena v2.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2c459de328fed05441ac03e83025bbff837b116df547716e12f05093c7467457
[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" "2c459de328fed05441ac03e83025bbff837b116df547716e12f05093c7467457", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2c459de328fed05441ac03e83025bbff837b116df547716e12f05093c7467457", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2c459de328fed05441ac03e83025bbff837b116df547716e12f05093c7467457", kill_on_drop: false }`
[INFO] [stdout] 2c459de328fed05441ac03e83025bbff837b116df547716e12f05093c7467457
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d9292fa1bc148dc5fedb3ba4705832d57d1e91f4717e9d2497bb32c27139571
[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" "1d9292fa1bc148dc5fedb3ba4705832d57d1e91f4717e9d2497bb32c27139571", kill_on_drop: false }`
[INFO] [stderr]     Checking typed-arena v2.0.0
[INFO] [stderr]  Documenting BinaryTree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]   --> src/main.rs:67:12
[INFO] [stdout]    |
[INFO] [stdout] 67 |         if (self.left.as_ref().unwrap().left.is_none()) {
[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 `if` condition
[INFO] [stdout]    --> src/main.rs:135:12
[INFO] [stdout]     |
[INFO] [stdout] 135 |         if (self.value.unwrap() <= value) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:136:16
[INFO] [stdout]     |
[INFO] [stdout] 136 |             if (self.right.is_none()) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:140:16
[INFO] [stdout]     |
[INFO] [stdout] 140 |               if (self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout]     |  ________________^
[INFO] [stdout] 141 | |                 && self.right.as_ref().unwrap().left.is_none()
[INFO] [stdout] 142 | |                 && self.right.as_ref().unwrap().right.is_none())
[INFO] [stdout]     | |________________________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 140 |             if self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout] 141 |                 && self.right.as_ref().unwrap().left.is_none()
[INFO] [stdout] 142 |                 && self.right.as_ref().unwrap().right.is_none()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:147:16
[INFO] [stdout]     |
[INFO] [stdout] 147 |               if (self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout]     |  ________________^
[INFO] [stdout] 148 | |                 && self.right.as_ref().unwrap().right.is_some())
[INFO] [stdout]     | |________________________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 147 |             if self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout] 148 |                 && self.right.as_ref().unwrap().right.is_some()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/main.rs:155:16
[INFO] [stdout]     |
[INFO] [stdout] 155 |               if (self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout]     |  ________________^
[INFO] [stdout] 156 | |                 && self.right.as_ref().unwrap().left.is_some())
[INFO] [stdout]     | |_______________________________________________________________^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 155 |             if self.right.as_ref().unwrap().value.unwrap() == value
[INFO] [stdout] 156 |                 && self.right.as_ref().unwrap().left.is_some()
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.88s
[INFO] running `Command { std: "docker" "inspect" "1d9292fa1bc148dc5fedb3ba4705832d57d1e91f4717e9d2497bb32c27139571", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d9292fa1bc148dc5fedb3ba4705832d57d1e91f4717e9d2497bb32c27139571", kill_on_drop: false }`
[INFO] [stdout] 1d9292fa1bc148dc5fedb3ba4705832d57d1e91f4717e9d2497bb32c27139571