[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] building rust-real-time-os/os_lab against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frust-real-time-os%2Fos_lab" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rust-real-time-os/os_lab on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-5-tc1/source/Cargo.toml
[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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5cad259b0ceea36be8dd77b56b807ea0f888f55d60979f4258f8c272b7c3252
[INFO] running `Command { std: "docker" "start" "-a" "f5cad259b0ceea36be8dd77b56b807ea0f888f55d60979f4258f8c272b7c3252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5cad259b0ceea36be8dd77b56b807ea0f888f55d60979f4258f8c272b7c3252", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5cad259b0ceea36be8dd77b56b807ea0f888f55d60979f4258f8c272b7c3252", kill_on_drop: false }`
[INFO] [stdout] f5cad259b0ceea36be8dd77b56b807ea0f888f55d60979f4258f8c272b7c3252
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fd8266614230eb47cd6e4fc8bbad7a7a45c667b9badc2f56669f136fd0796f8d
[INFO] running `Command { std: "docker" "start" "-a" "fd8266614230eb47cd6e4fc8bbad7a7a45c667b9badc2f56669f136fd0796f8d", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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<P>(&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)]` 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<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "fd8266614230eb47cd6e4fc8bbad7a7a45c667b9badc2f56669f136fd0796f8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd8266614230eb47cd6e4fc8bbad7a7a45c667b9badc2f56669f136fd0796f8d", kill_on_drop: false }`
[INFO] [stdout] fd8266614230eb47cd6e4fc8bbad7a7a45c667b9badc2f56669f136fd0796f8d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4caeb96d0e208c77770440384c14ce6414a95b0c10aa1baa2d509e9e4e5f7296
[INFO] running `Command { std: "docker" "start" "-a" "4caeb96d0e208c77770440384c14ce6414a95b0c10aa1baa2d509e9e4e5f7296", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `predicate`
[INFO] [stdout]    --> src/double_linked_list.rs:268:34
[INFO] [stdout]     |
[INFO] [stdout] 268 |     pub fn find_mut<P>(&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)]` 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<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling 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<P>(&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)]` 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<T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "4caeb96d0e208c77770440384c14ce6414a95b0c10aa1baa2d509e9e4e5f7296", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4caeb96d0e208c77770440384c14ce6414a95b0c10aa1baa2d509e9e4e5f7296", kill_on_drop: false }`
[INFO] [stdout] 4caeb96d0e208c77770440384c14ce6414a95b0c10aa1baa2d509e9e4e5f7296