[INFO] cloning repository https://github.com/ru5j4r0/leetcode
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ru5j4r0/leetcode" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fru5j4r0%2Fleetcode", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fru5j4r0%2Fleetcode'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f7f401584b6743dfa9c0e63957035ceb7eab5eea
[INFO] checking ru5j4r0/leetcode against master#8f359beca4e58bc3ae795a666301a8f47023044c for pr-121545
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fru5j4r0%2Fleetcode" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ru5j4r0/leetcode on toolchain 8f359beca4e58bc3ae795a666301a8f47023044c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc1/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/ru5j4r0/leetcode
[INFO] finished tweaking git repo https://github.com/ru5j4r0/leetcode
[INFO] tweaked toml for git repo https://github.com/ru5j4r0/leetcode written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ru5j4r0/leetcode already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f359beca4e58bc3ae795a666301a8f47023044c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking ru5j4r0/leetcode against try#7ee76453dd3eae6de6c1351f26482bed63b01beb for pr-121545
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fru5j4r0%2Fleetcode" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ru5j4r0/leetcode on toolchain 7ee76453dd3eae6de6c1351f26482bed63b01beb
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7ee76453dd3eae6de6c1351f26482bed63b01beb" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/ru5j4r0/leetcode
[INFO] finished tweaking git repo https://github.com/ru5j4r0/leetcode
[INFO] tweaked toml for git repo https://github.com/ru5j4r0/leetcode written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ru5j4r0/leetcode already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7ee76453dd3eae6de6c1351f26482bed63b01beb" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+7ee76453dd3eae6de6c1351f26482bed63b01beb" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd616531434809c21435e5a2fba1d25302dd1443ccd47a2244e1a82c3e0d49c7
[INFO] running `Command { std: "docker" "start" "-a" "fd616531434809c21435e5a2fba1d25302dd1443ccd47a2244e1a82c3e0d49c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd616531434809c21435e5a2fba1d25302dd1443ccd47a2244e1a82c3e0d49c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd616531434809c21435e5a2fba1d25302dd1443ccd47a2244e1a82c3e0d49c7", kill_on_drop: false }`
[INFO] [stdout] fd616531434809c21435e5a2fba1d25302dd1443ccd47a2244e1a82c3e0d49c7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+7ee76453dd3eae6de6c1351f26482bed63b01beb" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8e5751a7fa07e6cb6922228fea547bee7719c069f5d335a2988c8dd8187f2520
[INFO] running `Command { std: "docker" "start" "-a" "8e5751a7fa07e6cb6922228fea547bee7719c069f5d335a2988c8dd8187f2520", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking leetcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_inorder_traversal/recursion.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 21 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_inorder_traversal/recursion.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 23 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_postorder_traversal/recursion.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 21 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_postorder_traversal/recursion.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 23 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_preorder_traversal/recursion.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 21 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day10/binary_tree_preorder_traversal/recursion.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 23 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/binary_tree_level_order_traversal/recursion.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 34 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/binary_tree_level_order_traversal/recursion.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 36 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/maximum_depth_of_binary_tree/dfs.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 32 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/maximum_depth_of_binary_tree/dfs.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 34 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/symmetric_tree/bfs.rs:49:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 49 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day11/symmetric_tree/bfs.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 48 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 51 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day12/invert_binary_tree/recursion.rs:32:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 32 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day12/invert_binary_tree/recursion.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 34 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day12/path_sum/recursion.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 38 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day12/path_sum/recursion.rs:40:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 40 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day13/insert_into_a_binary_search_tree/recursion.rs:42:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 42 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day13/insert_into_a_binary_search_tree/recursion.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 44 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day13/search_in_a_binary_search_tree/recursion.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 31 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day13/search_in_a_binary_search_tree/recursion.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 33 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/lowest_common_ancestor_of_a_binary_search_tree/recursion.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 33 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/lowest_common_ancestor_of_a_binary_search_tree/recursion.rs:35:9
[INFO] [stdout]    |
[INFO] [stdout] 32 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 35 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/two_sum_iv_input_is_a_bst/recursion.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 36 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/two_sum_iv_input_is_a_bst/recursion.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 35 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 38 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `RefCell` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/validate_binary_search_tree/recursion.rs:48:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     use super::*;
[INFO] [stdout]    |         -------- the item `RefCell` is already imported here
[INFO] [stdout] 48 |     use std::cell::RefCell;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]   --> src/study_plan/data_structure/i/day14/validate_binary_search_tree/recursion.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 47 |     use super::*;
[INFO] [stdout]    |         -------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 50 |     use std::rc::Rc;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.40s
[INFO] running `Command { std: "docker" "inspect" "8e5751a7fa07e6cb6922228fea547bee7719c069f5d335a2988c8dd8187f2520", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e5751a7fa07e6cb6922228fea547bee7719c069f5d335a2988c8dd8187f2520", kill_on_drop: false }`
[INFO] [stdout] 8e5751a7fa07e6cb6922228fea547bee7719c069f5d335a2988c8dd8187f2520