[INFO] cloning repository https://github.com/dgunther2001/Rust_Linked_List [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dgunther2001/Rust_Linked_List" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdgunther2001%2FRust_Linked_List", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdgunther2001%2FRust_Linked_List'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] ff02fa9b5e6b6a0e76acd2c5966816b5667d6ca8 [INFO] checking dgunther2001/Rust_Linked_List/ff02fa9b5e6b6a0e76acd2c5966816b5667d6ca8 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdgunther2001%2FRust_Linked_List" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/dgunther2001/Rust_Linked_List on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/dgunther2001/Rust_Linked_List [INFO] finished tweaking git repo https://github.com/dgunther2001/Rust_Linked_List [INFO] tweaked toml for git repo https://github.com/dgunther2001/Rust_Linked_List written to /workspace/builds/worker-0-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/dgunther2001/Rust_Linked_List 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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 6e96999a4a80bc0d603bca39f317fa313194581a7f25fb9512bb57ed8ad213d4 [INFO] running `Command { std: "docker" "start" "-a" "6e96999a4a80bc0d603bca39f317fa313194581a7f25fb9512bb57ed8ad213d4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "6e96999a4a80bc0d603bca39f317fa313194581a7f25fb9512bb57ed8ad213d4", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6e96999a4a80bc0d603bca39f317fa313194581a7f25fb9512bb57ed8ad213d4", kill_on_drop: false }` [INFO] [stdout] 6e96999a4a80bc0d603bca39f317fa313194581a7f25fb9512bb57ed8ad213d4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 1054fde13c1503c99777ae95b34e6bb55f4bed2df4a693d9af197283ceb7abec [INFO] running `Command { std: "docker" "start" "-a" "1054fde13c1503c99777ae95b34e6bb55f4bed2df4a693d9af197283ceb7abec", kill_on_drop: false }` [INFO] [stderr] Checking dgunther2001-linked_list v1.0.8 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `crate::linked_list::LinkedList` [INFO] [stdout] --> src/lib.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 3 | use crate::linked_list::LinkedList; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/linked_list.rs:89:18 [INFO] [stdout] | [INFO] [stdout] 89 | Some(n) => { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/linked_list.rs:221:33 [INFO] [stdout] | [INFO] [stdout] 221 | ... self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a mutable... [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `next` and `iter` are never used [INFO] [stdout] --> src/linked_list.rs:29:8 [INFO] [stdout] | [INFO] [stdout] 21 | / impl ListNode [INFO] [stdout] 22 | | where T: Debug { [INFO] [stdout] | |______________- methods in this implementation [INFO] [stdout] ... [INFO] [stdout] 29 | fn next(&self) -> &Link { // implementation of a next function [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | fn iter(&self) { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `get_head_ref` is never used [INFO] [stdout] --> src/linked_list.rs:229:8 [INFO] [stdout] | [INFO] [stdout] 46 | / impl LinkedList [INFO] [stdout] 47 | | where T: Debug + Clone { [INFO] [stdout] | |______________________- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 229 | fn get_head_ref(&self) -> Option<&ListNode> { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/linked_list.rs:388:17 [INFO] [stdout] | [INFO] [stdout] 388 | write!(f, "{} ", n.el); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `n` [INFO] [stdout] --> src/linked_list.rs:89:18 [INFO] [stdout] | [INFO] [stdout] 89 | Some(n) => { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_n` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/linked_list.rs:221:33 [INFO] [stdout] | [INFO] [stdout] 221 | ... self.head.as_mut().map(|mut n| &mut n.el) // if the mutable reference to self.head is None, return None, otherwise return a mutable... [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: methods `next` and `iter` are never used [INFO] [stdout] --> src/linked_list.rs:29:8 [INFO] [stdout] | [INFO] [stdout] 21 | / impl ListNode [INFO] [stdout] 22 | | where T: Debug { [INFO] [stdout] | |______________- methods in this implementation [INFO] [stdout] ... [INFO] [stdout] 29 | fn next(&self) -> &Link { // implementation of a next function [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | fn iter(&self) { [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `get_head_ref` is never used [INFO] [stdout] --> src/linked_list.rs:229:8 [INFO] [stdout] | [INFO] [stdout] 46 | / impl LinkedList [INFO] [stdout] 47 | | where T: Debug + Clone { [INFO] [stdout] | |______________________- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 229 | fn get_head_ref(&self) -> Option<&ListNode> { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/linked_list.rs:388:17 [INFO] [stdout] | [INFO] [stdout] 388 | write!(f, "{} ", n.el); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s [INFO] running `Command { std: "docker" "inspect" "1054fde13c1503c99777ae95b34e6bb55f4bed2df4a693d9af197283ceb7abec", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1054fde13c1503c99777ae95b34e6bb55f4bed2df4a693d9af197283ceb7abec", kill_on_drop: false }` [INFO] [stdout] 1054fde13c1503c99777ae95b34e6bb55f4bed2df4a693d9af197283ceb7abec