[INFO] cloning repository https://github.com/rust-real-time-os/os_lab [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rust-real-time-os/os_lab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-real-time-os%2Fos_lab", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-real-time-os%2Fos_lab'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 4fe53abda22acf546525936027055e64cb5379a8 [INFO] checking rust-real-time-os/os_lab against c25253fac451fff60fb5b6c0b2c64d60f628c7cd for pr-160391 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-real-time-os%2Fos_lab" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'... [INFO] [stderr] done. [INFO] started tweaking git repo https://github.com/rust-real-time-os/os_lab [INFO] finished tweaking git repo https://github.com/rust-real-time-os/os_lab [INFO] tweaked toml for git repo https://github.com/rust-real-time-os/os_lab written to /workspace/builds/worker-3-tc1/source/Cargo.toml [INFO] validating manifest of git repo https://github.com/rust-real-time-os/os_lab on toolchain c25253fac451fff60fb5b6c0b2c64d60f628c7cd [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c25253fac451fff60fb5b6c0b2c64d60f628c7cd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] crate git repo https://github.com/rust-real-time-os/os_lab 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" "+c25253fac451fff60fb5b6c0b2c64d60f628c7cd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded libc v0.2.139 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }` [INFO] [stdout] d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53 [INFO] running `Command { std: "docker" "start" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53", kill_on_drop: false }` [INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53" "/opt/rustwide/cargo-home/bin/cargo" "+c25253fac451fff60fb5b6c0b2c64d60f628c7cd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53", kill_on_drop: false }` [INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53" "/opt/rustwide/cargo-home/bin/cargo" "+c25253fac451fff60fb5b6c0b2c64d60f628c7cd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.139 [INFO] [stderr] Checking getrandom v0.2.8 [INFO] [stderr] Checking rand_core v0.6.4 [INFO] [stderr] Checking rand_chacha v0.3.1 [INFO] [stderr] Checking rand v0.8.5 [INFO] [stderr] Checking linked_list v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `predicate` [INFO] [stdout] --> src/double_linked_list.rs:268:34 [INFO] [stdout] | [INFO] [stdout] 268 | pub fn find_mut

(&mut self,predicate:P)->Option<&mut T> where P:Fn(&T) -> bool{ [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_predicate` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Node` is never constructed [INFO] [stdout] --> src/double_linked_list.rs:13:8 [INFO] [stdout] | [INFO] [stdout] 13 | struct Node { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> src/double_linked_list.rs:175:17 [INFO] [stdout] | [INFO] [stdout] 175 | pub fn iter(&self) -> Iter { [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] 175 | pub fn iter(&self) -> Iter<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> src/double_linked_list.rs:184:21 [INFO] [stdout] | [INFO] [stdout] 184 | pub fn iter_mut(&mut self) -> IterMut { [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] 184 | pub fn iter_mut(&mut self) -> IterMut<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `predicate` [INFO] [stdout] --> src/double_linked_list.rs:268:34 [INFO] [stdout] | [INFO] [stdout] 268 | pub fn find_mut

(&mut self,predicate:P)->Option<&mut T> where P:Fn(&T) -> bool{ [INFO] [stdout] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_predicate` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: struct `Node` is never constructed [INFO] [stdout] --> src/double_linked_list.rs:13:8 [INFO] [stdout] | [INFO] [stdout] 13 | struct Node { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> src/double_linked_list.rs:175:17 [INFO] [stdout] | [INFO] [stdout] 175 | pub fn iter(&self) -> Iter { [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] 175 | pub fn iter(&self) -> Iter<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing [INFO] [stdout] --> src/double_linked_list.rs:184:21 [INFO] [stdout] | [INFO] [stdout] 184 | pub fn iter_mut(&mut self) -> IterMut { [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] 184 | pub fn iter_mut(&mut self) -> IterMut<'_, T> { [INFO] [stdout] | +++ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.41s [INFO] running `Command { std: "docker" "inspect" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53", kill_on_drop: false }` [INFO] [stdout] d4669d13a383c89499090672599ad031a9c240a0fec65cf150cbc519a38f8d53