[INFO] cloning repository https://github.com/Akash-Kumar-Sinha/ds_in_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Akash-Kumar-Sinha/ds_in_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAkash-Kumar-Sinha%2Fds_in_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAkash-Kumar-Sinha%2Fds_in_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fd1c7f7d34428035c7ed6e24ff09f4084ec4deeb
[INFO] checking Akash-Kumar-Sinha/ds_in_rust against master#36b21637e93b038453924d3c66821089e71d8baa for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAkash-Kumar-Sinha%2Fds_in_rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Akash-Kumar-Sinha/ds_in_rust
[INFO] finished tweaking git repo https://github.com/Akash-Kumar-Sinha/ds_in_rust
[INFO] tweaked toml for git repo https://github.com/Akash-Kumar-Sinha/ds_in_rust written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Akash-Kumar-Sinha/ds_in_rust on toolchain 36b21637e93b038453924d3c66821089e71d8baa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Akash-Kumar-Sinha/ds_in_rust 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" "+36b21637e93b038453924d3c66821089e71d8baa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 68613c6412400ecd5026cfc60a6cec1e09d2d12d663d612f919b19a057e4fb82
[INFO] running `Command { std: "docker" "start" "-a" "68613c6412400ecd5026cfc60a6cec1e09d2d12d663d612f919b19a057e4fb82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "68613c6412400ecd5026cfc60a6cec1e09d2d12d663d612f919b19a057e4fb82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68613c6412400ecd5026cfc60a6cec1e09d2d12d663d612f919b19a057e4fb82", kill_on_drop: false }`
[INFO] [stdout] 68613c6412400ecd5026cfc60a6cec1e09d2d12d663d612f919b19a057e4fb82
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0aedc67aab3ee74eddf33aa3f780725daceb07cf3f3561b36c57ca66d7f27407
[INFO] running `Command { std: "docker" "start" "-a" "0aedc67aab3ee74eddf33aa3f780725daceb07cf3f3561b36c57ca66d7f27407", kill_on_drop: false }`
[INFO] [stderr]     Checking ds_in_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/linked_list.rs:199:22
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn peak_elem(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ------ the lifetime gets resolved as `'_`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn peak_elem(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/linked_list.rs:205:22
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn last_elem(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ------ the lifetime gets resolved as `'_`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn last_elem(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/linked_list.rs:199:22
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn peak_elem(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ------ the lifetime gets resolved as `'_`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 199 |     pub fn peak_elem(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/linked_list.rs:205:22
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn last_elem(&self) -> Option<Ref<T>> {
[INFO] [stdout]     |                      ^^^^^            ------ the lifetime gets resolved as `'_`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 205 |     pub fn last_elem(&self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                           +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `Command { std: "docker" "inspect" "0aedc67aab3ee74eddf33aa3f780725daceb07cf3f3561b36c57ca66d7f27407", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0aedc67aab3ee74eddf33aa3f780725daceb07cf3f3561b36c57ca66d7f27407", kill_on_drop: false }`
[INFO] [stdout] 0aedc67aab3ee74eddf33aa3f780725daceb07cf3f3561b36c57ca66d7f27407
