[INFO] fetching crate toy_arena 0.2.0... [INFO] checking toy_arena-0.2.0 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1 [INFO] extracting crate toy_arena 0.2.0 into /workspace/builds/worker-1-tc1/source [INFO] validating manifest of crates.io crate toy_arena 0.2.0 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate toy_arena 0.2.0 [INFO] finished tweaking crates.io crate toy_arena 0.2.0 [INFO] tweaked toml for crates.io crate toy_arena 0.2.0 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 6 packages to latest compatible versions [INFO] [stderr] Adding syn v1.0.109 (latest: v2.0.77) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] cf82ea724b863b6380bc925fd1af8d4c676962d9a292e84f51299a102eb9f96a [INFO] running `Command { std: "docker" "start" "-a" "cf82ea724b863b6380bc925fd1af8d4c676962d9a292e84f51299a102eb9f96a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "cf82ea724b863b6380bc925fd1af8d4c676962d9a292e84f51299a102eb9f96a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "cf82ea724b863b6380bc925fd1af8d4c676962d9a292e84f51299a102eb9f96a", kill_on_drop: false }` [INFO] [stdout] cf82ea724b863b6380bc925fd1af8d4c676962d9a292e84f51299a102eb9f96a [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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] de10cfb14684710be13525e7ea3e8029b1cd797348a54612a242ad6fa3911d6b [INFO] running `Command { std: "docker" "start" "-a" "de10cfb14684710be13525e7ea3e8029b1cd797348a54612a242ad6fa3911d6b", kill_on_drop: false }` [INFO] [stderr] Compiling derivative v2.2.0 [INFO] [stderr] Checking toy_arena v0.2.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:340:13 [INFO] [stdout] | [INFO] [stdout] 340 | let mut slot_states = self.slot_states.get_mut(); [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: method `set_parent` is never used [INFO] [stdout] --> src/tree/link.rs:49:12 [INFO] [stdout] | [INFO] [stdout] 37 | impl Link { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 49 | pub fn set_parent(&mut self, parent: Option) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/lib.rs:428:13 [INFO] [stdout] | [INFO] [stdout] 428 | drop(slot_states); [INFO] [stdout] | ^^^^^-----------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut SlotStates` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 428 - drop(slot_states); [INFO] [stdout] 428 + let _ = slot_states; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:340:13 [INFO] [stdout] | [INFO] [stdout] 340 | let mut slot_states = self.slot_states.get_mut(); [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: method `set_parent` is never used [INFO] [stdout] --> src/tree/link.rs:49:12 [INFO] [stdout] | [INFO] [stdout] 37 | impl Link { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 49 | pub fn set_parent(&mut self, parent: Option) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/lib.rs:428:13 [INFO] [stdout] | [INFO] [stdout] 428 | drop(slot_states); [INFO] [stdout] | ^^^^^-----------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut SlotStates` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 428 - drop(slot_states); [INFO] [stdout] 428 + let _ = slot_states; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.96s [INFO] running `Command { std: "docker" "inspect" "de10cfb14684710be13525e7ea3e8029b1cd797348a54612a242ad6fa3911d6b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "de10cfb14684710be13525e7ea3e8029b1cd797348a54612a242ad6fa3911d6b", kill_on_drop: false }` [INFO] [stdout] de10cfb14684710be13525e7ea3e8029b1cd797348a54612a242ad6fa3911d6b [INFO] checking toy_arena-0.2.0 against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1 [INFO] extracting crate toy_arena 0.2.0 into /workspace/builds/worker-1-tc2/source [INFO] validating manifest of crates.io crate toy_arena 0.2.0 on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate toy_arena 0.2.0 [INFO] finished tweaking crates.io crate toy_arena 0.2.0 [INFO] tweaked toml for crates.io crate toy_arena 0.2.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Updating crates.io index [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Locking 6 packages to latest compatible versions [INFO] [stderr] Adding syn v1.0.109 (latest: v2.0.77) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 6e0f0b179cb8e1ff9642970c1f3c8d64b5598f688d964478eb25d4b218c1cdba [INFO] running `Command { std: "docker" "start" "-a" "6e0f0b179cb8e1ff9642970c1f3c8d64b5598f688d964478eb25d4b218c1cdba", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "6e0f0b179cb8e1ff9642970c1f3c8d64b5598f688d964478eb25d4b218c1cdba", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "6e0f0b179cb8e1ff9642970c1f3c8d64b5598f688d964478eb25d4b218c1cdba", kill_on_drop: false }` [INFO] [stdout] 6e0f0b179cb8e1ff9642970c1f3c8d64b5598f688d964478eb25d4b218c1cdba [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 7daec8df5b39d0836613da61a3eee9d22502325d59d7edbaea6fe0b25bf110e1 [INFO] running `Command { std: "docker" "start" "-a" "7daec8df5b39d0836613da61a3eee9d22502325d59d7edbaea6fe0b25bf110e1", kill_on_drop: false }` [INFO] [stderr] Compiling derivative v2.2.0 [INFO] [stderr] Checking toy_arena v0.2.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/lib.rs:340:13 [INFO] [stdout] | [INFO] [stdout] 340 | let mut slot_states = self.slot_states.get_mut(); [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] --> src/lib.rs:340:13 [INFO] [stdout] | [INFO] [stdout] 340 | let mut slot_states = self.slot_states.get_mut(); [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: method `set_parent` is never used [INFO] [stdout] --> src/tree/link.rs:49:12 [INFO] [stdout] | [INFO] [stdout] 37 | impl Link { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 49 | pub fn set_parent(&mut self, parent: Option) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: method `set_parent` is never used [INFO] [stdout] --> src/tree/link.rs:49:12 [INFO] [stdout] | [INFO] [stdout] 37 | impl Link { [INFO] [stdout] | --------- method in this implementation [INFO] [stdout] ... [INFO] [stdout] 49 | pub fn set_parent(&mut self, parent: Option) { [INFO] [stdout] | ^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/lib.rs:428:13 [INFO] [stdout] | [INFO] [stdout] 428 | drop(slot_states); [INFO] [stdout] | ^^^^^-----------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut SlotStates` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 428 - drop(slot_states); [INFO] [stdout] 428 + let _ = slot_states; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing [INFO] [stdout] --> src/lib.rs:428:13 [INFO] [stdout] | [INFO] [stdout] 428 | drop(slot_states); [INFO] [stdout] | ^^^^^-----------^ [INFO] [stdout] | | [INFO] [stdout] | argument has type `&mut SlotStates` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dropping_references)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the expression or result [INFO] [stdout] | [INFO] [stdout] 428 - drop(slot_states); [INFO] [stdout] 428 + let _ = slot_states; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.55s [INFO] running `Command { std: "docker" "inspect" "7daec8df5b39d0836613da61a3eee9d22502325d59d7edbaea6fe0b25bf110e1", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "7daec8df5b39d0836613da61a3eee9d22502325d59d7edbaea6fe0b25bf110e1", kill_on_drop: false }` [INFO] [stdout] 7daec8df5b39d0836613da61a3eee9d22502325d59d7edbaea6fe0b25bf110e1