[INFO] cloning repository https://github.com/huchenxu97/learn [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/huchenxu97/learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 420b0a7c501febfbdc18bfd2a9ee7e037d5ecb4d [INFO] checking huchenxu97/learn against master#8a65ee08296b36342bf7c3cdc15312ccbc357227 for pr-142704 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhuchenxu97%2Flearn" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/huchenxu97/learn on toolchain 8a65ee08296b36342bf7c3cdc15312ccbc357227 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/huchenxu97/learn [INFO] finished tweaking git repo https://github.com/huchenxu97/learn [INFO] tweaked toml for git repo https://github.com/huchenxu97/learn written to /workspace/builds/worker-2-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/huchenxu97/learn 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" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367 [INFO] running `Command { std: "docker" "start" "-a" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367", kill_on_drop: false }` [INFO] [stdout] 4d2c8776b331ac6c284bd1687bd87609dbd60cc696da29c14411a541b53cd367 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8a65ee08296b36342bf7c3cdc15312ccbc357227" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3 [INFO] running `Command { std: "docker" "start" "-a" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }` [INFO] [stderr] Checking learn v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `header` is never read [INFO] [stdout] --> src/first.rs:3:5 [INFO] [stdout] | [INFO] [stdout] 2 | pub struct List{ [INFO] [stdout] | ---- field in this struct [INFO] [stdout] 3 | header: Link, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variants `Empty` and `More` are never constructed [INFO] [stdout] --> src/first.rs:7:5 [INFO] [stdout] | [INFO] [stdout] 6 | enum Link { [INFO] [stdout] | ---- variants in this enum [INFO] [stdout] 7 | Empty, [INFO] [stdout] | ^^^^^ [INFO] [stdout] 8 | More(Box) [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Link` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: fields `elem` and `next` are never read [INFO] [stdout] --> src/first.rs:12:5 [INFO] [stdout] | [INFO] [stdout] 11 | struct Node{ [INFO] [stdout] | ---- fields in this struct [INFO] [stdout] 12 | elem: i32, [INFO] [stdout] | ^^^^ [INFO] [stdout] 13 | next: Link, [INFO] [stdout] | ^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Node` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, and `pop` are never used [INFO] [stdout] --> src/first.rs:17:8 [INFO] [stdout] | [INFO] [stdout] 16 | impl List { [INFO] [stdout] | --------- associated items in this implementation [INFO] [stdout] 17 | fn new()->Self{ [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 22 | fn push(&mut self, elem: i32){ [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | fn pop(&mut self) -> Option{ [INFO] [stdout] | ^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: associated items `new`, `push`, `peek`, `peek_mut`, and `into_iter` are never used [INFO] [stdout] --> src/second.rs:15:8 [INFO] [stdout] | [INFO] [stdout] 14 | impl List { [INFO] [stdout] | --------------- associated items in this implementation [INFO] [stdout] 15 | fn new()->Self{ [INFO] [stdout] | ^^^ [INFO] [stdout] ... [INFO] [stdout] 19 | fn push(&mut self, item: T){ [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 33 | fn peek(&self)->Option<&T>{ [INFO] [stdout] | ^^^^ [INFO] [stdout] ... [INFO] [stdout] 37 | fn peek_mut(&mut self)->Option<&mut T>{ [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] ... [INFO] [stdout] 41 | fn into_iter(self)->IntoIter{ [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.26s [INFO] running `Command { std: "docker" "inspect" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3", kill_on_drop: false }` [INFO] [stdout] 282105a762c437721f5d214cebf4096d00dd65d37b9d7ab75c8e10a3699a52c3