[INFO] cloning repository https://github.com/trinitronx/rust-understanding-ownership [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/trinitronx/rust-understanding-ownership" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrinitronx%2Frust-understanding-ownership", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrinitronx%2Frust-understanding-ownership'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 57778d31155d6500a7cecc437d5dc85fcf3a1d2b [INFO] checking trinitronx/rust-understanding-ownership against master#a5db378dc14a40dd1580c27fb8362156446382c3 for pr-136490 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrinitronx%2Frust-understanding-ownership" "/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/trinitronx/rust-understanding-ownership on toolchain a5db378dc14a40dd1580c27fb8362156446382c3 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a5db378dc14a40dd1580c27fb8362156446382c3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/trinitronx/rust-understanding-ownership [INFO] finished tweaking git repo https://github.com/trinitronx/rust-understanding-ownership [INFO] tweaked toml for git repo https://github.com/trinitronx/rust-understanding-ownership written to /workspace/builds/worker-5-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/trinitronx/rust-understanding-ownership 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" "+a5db378dc14a40dd1580c27fb8362156446382c3" "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-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a5db378dc14a40dd1580c27fb8362156446382c3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 946e1ef8c27500f712ef17a488bb510b6c323cfe3667cbd229720934d789256e [INFO] running `Command { std: "docker" "start" "-a" "946e1ef8c27500f712ef17a488bb510b6c323cfe3667cbd229720934d789256e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "946e1ef8c27500f712ef17a488bb510b6c323cfe3667cbd229720934d789256e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "946e1ef8c27500f712ef17a488bb510b6c323cfe3667cbd229720934d789256e", kill_on_drop: false }` [INFO] [stdout] 946e1ef8c27500f712ef17a488bb510b6c323cfe3667cbd229720934d789256e [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" "-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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a5db378dc14a40dd1580c27fb8362156446382c3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] b561087ac22b0d9301483fc3bbad7991c3993d31affc40d61b5e2086dbc7c32a [INFO] running `Command { std: "docker" "start" "-a" "b561087ac22b0d9301483fc3bbad7991c3993d31affc40d61b5e2086dbc7c32a", kill_on_drop: false }` [INFO] [stderr] Checking understanding-ownership v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/main.rs:154:9 [INFO] [stdout] | [INFO] [stdout] 154 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/main.rs:159:9 [INFO] [stdout] | [INFO] [stdout] 159 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/main.rs:262:13 [INFO] [stdout] | [INFO] [stdout] 262 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/main.rs:265:9 [INFO] [stdout] | [INFO] [stdout] 265 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:270:9 [INFO] [stdout] | [INFO] [stdout] 270 | let mut s = String::from("hello"); [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: unused variable: `word` [INFO] [stdout] --> src/main.rs:353:9 [INFO] [stdout] | [INFO] [stdout] 353 | let word = first_word(&s); // word will get the value 5 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s1` [INFO] [stdout] --> src/main.rs:154:9 [INFO] [stdout] | [INFO] [stdout] 154 | let s1 = gives_ownership(); // gives_ownership moves its return [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s1` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `s3` [INFO] [stdout] --> src/main.rs:159:9 [INFO] [stdout] | [INFO] [stdout] 159 | let s3 = takes_and_gives_back(s2); // s2 is moved into [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_s3` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r1` [INFO] [stdout] --> src/main.rs:262:13 [INFO] [stdout] | [INFO] [stdout] 262 | let r1 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r1` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `r2` [INFO] [stdout] --> src/main.rs:265:9 [INFO] [stdout] | [INFO] [stdout] 265 | let r2 = &mut s; [INFO] [stdout] | ^^ help: if this is intentional, prefix it with an underscore: `_r2` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/main.rs:270:9 [INFO] [stdout] | [INFO] [stdout] 270 | let mut s = String::from("hello"); [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: unused variable: `word` [INFO] [stdout] --> src/main.rs:353:9 [INFO] [stdout] | [INFO] [stdout] 353 | let word = first_word(&s); // word will get the value 5 [INFO] [stdout] | ^^^^ help: if this is intentional, prefix it with an underscore: `_word` [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s [INFO] running `Command { std: "docker" "inspect" "b561087ac22b0d9301483fc3bbad7991c3993d31affc40d61b5e2086dbc7c32a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "b561087ac22b0d9301483fc3bbad7991c3993d31affc40d61b5e2086dbc7c32a", kill_on_drop: false }` [INFO] [stdout] b561087ac22b0d9301483fc3bbad7991c3993d31affc40d61b5e2086dbc7c32a