[INFO] cloning repository https://github.com/arunkumar-reddy/Rust-Intro
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/arunkumar-reddy/Rust-Intro" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar-reddy%2FRust-Intro", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar-reddy%2FRust-Intro'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 73e291e75bfee1cb3553d9dbc3febc54205007b7
[INFO] checking arunkumar-reddy/Rust-Intro against master#3aedcf06b73fc36feeebca3d579e1d2a6c40acc5 for pr-65819
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Farunkumar-reddy%2FRust-Intro" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/arunkumar-reddy/Rust-Intro on toolchain 3aedcf06b73fc36feeebca3d579e1d2a6c40acc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/arunkumar-reddy/Rust-Intro
[INFO] finished tweaking git repo https://github.com/arunkumar-reddy/Rust-Intro
[INFO] tweaked toml for git repo https://github.com/arunkumar-reddy/Rust-Intro written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/arunkumar-reddy/Rust-Intro already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fc19e90a7dd9fd188f47c1c8ee504508b2c9f99d2d5f73753b772ace76818e88
[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" "fc19e90a7dd9fd188f47c1c8ee504508b2c9f99d2d5f73753b772ace76818e88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc19e90a7dd9fd188f47c1c8ee504508b2c9f99d2d5f73753b772ace76818e88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc19e90a7dd9fd188f47c1c8ee504508b2c9f99d2d5f73753b772ace76818e88", kill_on_drop: false }`
[INFO] [stdout] fc19e90a7dd9fd188f47c1c8ee504508b2c9f99d2d5f73753b772ace76818e88
[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:c46a2d1a26fb48b37929c74ca49dd9409f2375a0a3bdb8fe07617f3ffccaa889" "/opt/rustwide/cargo-home/bin/cargo" "+3aedcf06b73fc36feeebca3d579e1d2a6c40acc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e8ed108ef73269d3db810faa227674873ae55522d87ae418443fd00230acea09
[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" "e8ed108ef73269d3db810faa227674873ae55522d87ae418443fd00230acea09", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.78
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling syn v1.0.42
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.25
[INFO] [stderr]    Compiling cc v1.0.60
[INFO] [stderr]     Checking bytes v0.5.6
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]     Checking fnv v1.0.7
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]     Checking arc-swap v0.4.7
[INFO] [stderr]     Checking pin-project-lite v0.1.10
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]     Checking itoa v0.4.6
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]    Compiling openssl v0.10.30
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]    Compiling native-tls v0.2.4
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking tinyvec v0.3.4
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling serde v1.0.116
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]     Checking percent-encoding v2.1.0
[INFO] [stderr]    Compiling encoding_rs v0.8.24
[INFO] [stderr]     Checking httpdate v0.3.2
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking dtoa v0.4.6
[INFO] [stderr]     Checking ipnet v2.3.0
[INFO] [stderr]     Checking base64 v0.12.3
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]     Checking unicode-normalization v0.1.13
[INFO] [stderr]    Compiling indexmap v1.6.0
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking tracing v0.1.21
[INFO] [stderr]    Compiling mime_guess v2.0.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling openssl-sys v0.9.58
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking net2 v0.2.35
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking signal-hook-registry v1.2.1
[INFO] [stderr]     Checking socket2 v0.3.15
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking pin-project v0.4.25
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]     Checking tokio-tls v0.3.1
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]     Checking futures-executor v0.3.5
[INFO] [stderr]     Checking futures v0.3.5
[INFO] [stderr]     Checking hyper v0.13.8
[INFO] [stderr]     Checking hyper-tls v0.4.3
[INFO] [stderr]     Checking reqwest v0.10.8
[INFO] [stderr]     Checking rust_intro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/async_await/mod.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let res = match res {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]   --> src/async_await/mod.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let res = match res {
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/mod.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub fn new(value: u32) -> Node {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/bst/mod.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn search(&self, val: i32) -> Option<&Node> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]    --> src/bst/mod.rs:141:12
[INFO] [stdout]     |
[INFO] [stdout] 141 |     pub fn search(&self, val: i32) -> Option<&Node> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/linked_list/mod.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |     pub fn new(value: u32) -> Node {
[INFO] [stdout]    |            ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]   --> src/bst/mod.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn search(&self, val: i32) -> Option<&Node> {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search`
[INFO] [stdout]    --> src/bst/mod.rs:141:12
[INFO] [stdout]     |
[INFO] [stdout] 141 |     pub fn search(&self, val: i32) -> Option<&Node> {
[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 [unoptimized + debuginfo] target(s) in 1m 25s
[INFO] running `Command { std: "docker" "inspect" "e8ed108ef73269d3db810faa227674873ae55522d87ae418443fd00230acea09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8ed108ef73269d3db810faa227674873ae55522d87ae418443fd00230acea09", kill_on_drop: false }`
[INFO] [stdout] e8ed108ef73269d3db810faa227674873ae55522d87ae418443fd00230acea09