[INFO] fetching crate cain 0.1.2... [INFO] checking cain-0.1.2 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604 [INFO] extracting crate cain 0.1.2 into /workspace/builds/worker-1-tc1/source [INFO] validating manifest of crates.io crate cain 0.1.2 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate cain 0.1.2 [INFO] finished tweaking crates.io crate cain 0.1.2 [INFO] tweaked toml for crates.io crate cain 0.1.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 8 packages to latest compatible versions [INFO] [stderr] Adding syn v1.0.109 (latest: v2.0.77) [INFO] [stderr] Adding yansi v0.5.1 (latest: v1.0.1) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 0e87936ed233f5b35f380a471bcb582a0677d2c7ec2fe43f7714112dd603bfd7 [INFO] running `Command { std: "docker" "start" "-a" "0e87936ed233f5b35f380a471bcb582a0677d2c7ec2fe43f7714112dd603bfd7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0e87936ed233f5b35f380a471bcb582a0677d2c7ec2fe43f7714112dd603bfd7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0e87936ed233f5b35f380a471bcb582a0677d2c7ec2fe43f7714112dd603bfd7", kill_on_drop: false }` [INFO] [stdout] 0e87936ed233f5b35f380a471bcb582a0677d2c7ec2fe43f7714112dd603bfd7 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 61d886f58f8cb36200eb0ef6a46c8399fd896698c414ba5938a66131094c8009 [INFO] running `Command { std: "docker" "start" "-a" "61d886f58f8cb36200eb0ef6a46c8399fd896698c414ba5938a66131094c8009", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Checking yansi v0.5.1 [INFO] [stderr] Checking diff v0.1.13 [INFO] [stderr] Checking pretty_assertions v1.4.0 [INFO] [stderr] Checking cain v0.1.2 (/opt/rustwide/workdir) [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:31:30 [INFO] [stdout] | [INFO] [stdout] 31 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unreachable_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:56:30 [INFO] [stdout] | [INFO] [stdout] 56 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:56:30 [INFO] [stdout] | [INFO] [stdout] 56 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:56:30 [INFO] [stdout] | [INFO] [stdout] 56 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:49:30 [INFO] [stdout] | [INFO] [stdout] 49 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unreachable expression [INFO] [stdout] --> tests/diverging_branches.rs:56:30 [INFO] [stdout] | [INFO] [stdout] 56 | _ => panic!() as &str, [INFO] [stdout] | --------^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | unreachable expression [INFO] [stdout] | any code following this expression is unreachable [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> tests/diverging_branches.rs:26:25 [INFO] [stdout] | [INFO] [stdout] 26 | let x = match n { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `y` [INFO] [stdout] --> tests/diverging_branches.rs:52:25 [INFO] [stdout] | [INFO] [stdout] 52 | let y = match n % 2 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_y` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `x` [INFO] [stdout] --> tests/diverging_branches.rs:44:25 [INFO] [stdout] | [INFO] [stdout] 44 | let x = match n % 3 { [INFO] [stdout] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 9 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> tests/no_behavior_change.rs:64:22 [INFO] [stdout] | [INFO] [stdout] 64 | Some(mut v) => { v.pop(); }, [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: variable does not need to be mutable [INFO] [stdout] --> tests/no_behavior_change.rs:78:22 [INFO] [stdout] | [INFO] [stdout] 78 | Some(mut b) => inc(&mut b), [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> tests/no_behavior_change.rs:109:22 [INFO] [stdout] | [INFO] [stdout] 109 | Some(mut b) => inc(&mut b), [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> tests/no_behavior_change.rs:140:26 [INFO] [stdout] | [INFO] [stdout] 140 | Some(ref mut b) => inc(b), [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> tests/no_behavior_change.rs:154:37 [INFO] [stdout] | [INFO] [stdout] 154 | let _ = if let Some(ref mut b) = &mut a { [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: irrefutable `if let` pattern [INFO] [stdout] --> tests/no_behavior_change.rs:179:16 [INFO] [stdout] | [INFO] [stdout] 179 | if let None = a { [INFO] [stdout] | ^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this pattern will always match, so the `if let` is useless [INFO] [stdout] = help: consider replacing the `if let` with a `let` [INFO] [stdout] = note: `#[warn(irrefutable_let_patterns)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 6 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.32s [INFO] running `Command { std: "docker" "inspect" "61d886f58f8cb36200eb0ef6a46c8399fd896698c414ba5938a66131094c8009", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "61d886f58f8cb36200eb0ef6a46c8399fd896698c414ba5938a66131094c8009", kill_on_drop: false }` [INFO] [stdout] 61d886f58f8cb36200eb0ef6a46c8399fd896698c414ba5938a66131094c8009