[INFO] cloning repository https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 1)
[INFO] cloning repository https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 361b8e639f30a5242e5958d7ea89e8ed32e7e8c8
[INFO] checking ghanshyamkryadav2001/rust-ques-sol-ghanu-2001 against master#d8810e3e2dab96778d20dd6d746ff95465515509 for pr-137033
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fghanshyamkryadav2001%2Frust-ques-sol-ghanu-2001" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001 on toolchain d8810e3e2dab96778d20dd6d746ff95465515509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d8810e3e2dab96778d20dd6d746ff95465515509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001
[INFO] finished tweaking git repo https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001
[INFO] tweaked toml for git repo https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ghanshyamkryadav2001/rust-ques-sol-ghanu-2001 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" "+d8810e3e2dab96778d20dd6d746ff95465515509" "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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+d8810e3e2dab96778d20dd6d746ff95465515509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8ff2dca648a461c297bd178e16b636986c8fb7a7e25b5188f3ff9e44ef38f875
[INFO] running `Command { std: "docker" "start" "-a" "8ff2dca648a461c297bd178e16b636986c8fb7a7e25b5188f3ff9e44ef38f875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ff2dca648a461c297bd178e16b636986c8fb7a7e25b5188f3ff9e44ef38f875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ff2dca648a461c297bd178e16b636986c8fb7a7e25b5188f3ff9e44ef38f875", kill_on_drop: false }`
[INFO] [stdout] 8ff2dca648a461c297bd178e16b636986c8fb7a7e25b5188f3ff9e44ef38f875
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:3959728d45483eb673ba100a951a6b9f5012970368db2a9e08e0ac9b67c8a5ad" "/opt/rustwide/cargo-home/bin/cargo" "+d8810e3e2dab96778d20dd6d746ff95465515509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92abe8d7adb3e4931b1107f4e4dac382cb4f188a61a3b4108fe0d9a26c45681b
[INFO] running `Command { std: "docker" "start" "-a" "92abe8d7adb3e4931b1107f4e4dac382cb4f188a61a3b4108fe0d9a26c45681b", kill_on_drop: false }`
[INFO] [stderr]     Checking quadtech v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `TreeNode` is more private than the item `max_depth`
[INFO] [stdout]  --> src/max_depth.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn max_depth(root: &Option<Box<TreeNode>>) -> i32 {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function `max_depth` is reachable at visibility `pub(crate)`
[INFO] [stdout]   |
[INFO] [stdout] note: but type `TreeNode` is only usable at visibility `pub(self)`
[INFO] [stdout]  --> src/max_depth.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TreeNode {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `val` is never read
[INFO] [stdout]  --> src/max_depth.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TreeNode {
[INFO] [stdout]   |        -------- field in this struct
[INFO] [stdout] 4 |     val: i32,                         
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `TreeNode` is more private than the item `max_depth`
[INFO] [stdout]  --> src/max_depth.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn max_depth(root: &Option<Box<TreeNode>>) -> i32 {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ function `max_depth` is reachable at visibility `pub(crate)`
[INFO] [stdout]   |
[INFO] [stdout] note: but type `TreeNode` is only usable at visibility `pub(self)`
[INFO] [stdout]  --> src/max_depth.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TreeNode {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `val` is never read
[INFO] [stdout]  --> src/max_depth.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct TreeNode {
[INFO] [stdout]   |        -------- field in this struct
[INFO] [stdout] 4 |     val: i32,                         
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "92abe8d7adb3e4931b1107f4e4dac382cb4f188a61a3b4108fe0d9a26c45681b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92abe8d7adb3e4931b1107f4e4dac382cb4f188a61a3b4108fe0d9a26c45681b", kill_on_drop: false }`
[INFO] [stdout] 92abe8d7adb3e4931b1107f4e4dac382cb4f188a61a3b4108fe0d9a26c45681b