[INFO] cloning repository https://github.com/Berteun/rust-toy-list
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Berteun/rust-toy-list" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8c02b9732a93b89c6528d053069dafac7f7b6bfe
[INFO] checking Berteun/rust-toy-list against master#cfbc6d4cf1acbac5c025acf8ed68929caa551df3 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBerteun%2Frust-toy-list" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Berteun/rust-toy-list on toolchain cfbc6d4cf1acbac5c025acf8ed68929caa551df3
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Berteun/rust-toy-list
[INFO] finished tweaking git repo https://github.com/Berteun/rust-toy-list
[INFO] tweaked toml for git repo https://github.com/Berteun/rust-toy-list written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/Berteun/rust-toy-list already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e00f318fc581d3860f312097a7eae1dda8c01f92889de74ccb74cce42ef3995f
[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" "e00f318fc581d3860f312097a7eae1dda8c01f92889de74ccb74cce42ef3995f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e00f318fc581d3860f312097a7eae1dda8c01f92889de74ccb74cce42ef3995f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e00f318fc581d3860f312097a7eae1dda8c01f92889de74ccb74cce42ef3995f", kill_on_drop: false }`
[INFO] [stdout] e00f318fc581d3860f312097a7eae1dda8c01f92889de74ccb74cce42ef3995f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+cfbc6d4cf1acbac5c025acf8ed68929caa551df3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30b8cf1d0a12c673b675181cf28965fa97479d48744b41315ae01ed069be91d4
[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" "30b8cf1d0a12c673b675181cf28965fa97479d48744b41315ae01ed069be91d4", kill_on_drop: false }`
[INFO] [stderr]     Checking reverse v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: private type `list::Node<T>` in public interface (error E0446)
[INFO] [stdout]   --> src/list/mod.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | /     pub fn first(&self) -> Option<&Node<T>>
[INFO] [stdout] 66 | |     {
[INFO] [stdout] 67 | |         match self.head
[INFO] [stdout] 68 | |         {
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |         }
[INFO] [stdout] 72 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `list::Node<T>` in public interface (error E0446)
[INFO] [stdout]   --> src/list/mod.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | /     pub fn last(&self) -> Option<&Node<T>>
[INFO] [stdout] 75 | |     {
[INFO] [stdout] 76 | |         match self.head {
[INFO] [stdout] 77 | |             Some(ref boxed_node) => Some(boxed_node.last()),
[INFO] [stdout] 78 | |             None => None
[INFO] [stdout] 79 | |         }
[INFO] [stdout] 80 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/list/mod.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         mem::replace(self, new_list);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `list::Node<T>` in public interface (error E0446)
[INFO] [stdout]   --> src/list/mod.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 65 | /     pub fn first(&self) -> Option<&Node<T>>
[INFO] [stdout] 66 | |     {
[INFO] [stdout] 67 | |         match self.head
[INFO] [stdout] 68 | |         {
[INFO] [stdout] ...  |
[INFO] [stdout] 71 | |         }
[INFO] [stdout] 72 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(private_in_public)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: private type `list::Node<T>` in public interface (error E0446)
[INFO] [stdout]   --> src/list/mod.rs:74:5
[INFO] [stdout]    |
[INFO] [stdout] 74 | /     pub fn last(&self) -> Option<&Node<T>>
[INFO] [stdout] 75 | |     {
[INFO] [stdout] 76 | |         match self.head {
[INFO] [stdout] 77 | |             Some(ref boxed_node) => Some(boxed_node.last()),
[INFO] [stdout] 78 | |             None => None
[INFO] [stdout] 79 | |         }
[INFO] [stdout] 80 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #34537 <https://github.com/rust-lang/rust/issues/34537>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]    --> src/list/mod.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         mem::replace(self, new_list);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `Command { std: "docker" "inspect" "30b8cf1d0a12c673b675181cf28965fa97479d48744b41315ae01ed069be91d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30b8cf1d0a12c673b675181cf28965fa97479d48744b41315ae01ed069be91d4", kill_on_drop: false }`
[INFO] [stdout] 30b8cf1d0a12c673b675181cf28965fa97479d48744b41315ae01ed069be91d4
