[INFO] cloning repository https://github.com/elamani-drawing/rust_algo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/elamani-drawing/rust_algo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felamani-drawing%2Frust_algo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felamani-drawing%2Frust_algo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2238f9fc92d5b9dbc81dcecf92ef91d8ea3bcf55
[INFO] checking elamani-drawing/rust_algo against try#a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399 for pr-145770
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Felamani-drawing%2Frust_algo" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/elamani-drawing/rust_algo
[INFO] finished tweaking git repo https://github.com/elamani-drawing/rust_algo
[INFO] tweaked toml for git repo https://github.com/elamani-drawing/rust_algo written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/elamani-drawing/rust_algo on toolchain a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/elamani-drawing/rust_algo 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" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c09ff9903004ea54108b7458b1a268d9a4490fead3435f9d9f30cfa3d656ed62
[INFO] running `Command { std: "docker" "start" "-a" "c09ff9903004ea54108b7458b1a268d9a4490fead3435f9d9f30cfa3d656ed62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c09ff9903004ea54108b7458b1a268d9a4490fead3435f9d9f30cfa3d656ed62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c09ff9903004ea54108b7458b1a268d9a4490fead3435f9d9f30cfa3d656ed62", kill_on_drop: false }`
[INFO] [stdout] c09ff9903004ea54108b7458b1a268d9a4490fead3435f9d9f30cfa3d656ed62
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a2a6e871b05c7b8ecc9a3c8a20db1f39e995e399" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa1f33398d815de99745f079f53f5d8011167400eba4dfbd7d4bf176cad074b4
[INFO] running `Command { std: "docker" "start" "-a" "aa1f33398d815de99745f079f53f5d8011167400eba4dfbd7d4bf176cad074b4", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_algo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:226:21
[INFO] [stdout]     |
[INFO] [stdout] 226 |     fn get_back_ref(&mut self) -> Option<Ref<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            ------ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 226 |     fn get_back_ref(&mut self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:232:21
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn get_back_mut(&mut self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            --------- the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn get_back_mut(&mut self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:270:21
[INFO] [stdout]     |
[INFO] [stdout] 270 |     pub fn back_ref(&mut self) -> Option<Ref<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            ------ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 270 |     pub fn back_ref(&mut self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:292:21
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn back_mut(&mut self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            --------- the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn back_mut(&mut self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:226:21
[INFO] [stdout]     |
[INFO] [stdout] 226 |     fn get_back_ref(&mut self) -> Option<Ref<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            ------ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 226 |     fn get_back_ref(&mut self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:232:21
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn get_back_mut(&mut self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            --------- the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 232 |     fn get_back_mut(&mut self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:270:21
[INFO] [stdout]     |
[INFO] [stdout] 270 |     pub fn back_ref(&mut self) -> Option<Ref<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            ------ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 270 |     pub fn back_ref(&mut self) -> Option<Ref<'_, T>> {
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collections/linked_list.rs:292:21
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn back_mut(&mut self) -> Option<RefMut<T>> {
[INFO] [stdout]     |                     ^^^^^^^^^            --------- the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 292 |     pub fn back_mut(&mut self) -> Option<RefMut<'_, T>> {
[INFO] [stdout]     |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.42s
[INFO] running `Command { std: "docker" "inspect" "aa1f33398d815de99745f079f53f5d8011167400eba4dfbd7d4bf176cad074b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa1f33398d815de99745f079f53f5d8011167400eba4dfbd7d4bf176cad074b4", kill_on_drop: false }`
[INFO] [stdout] aa1f33398d815de99745f079f53f5d8011167400eba4dfbd7d4bf176cad074b4
