[INFO] fetching crate backtracking_iterator 0.4.4...
[INFO] checking backtracking_iterator-0.4.4 against master#6526e5c772f2da07db745c94ca6bb0a591a39ba4 for pr-80920
[INFO] extracting crate backtracking_iterator 0.4.4 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate backtracking_iterator 0.4.4 on toolchain 6526e5c772f2da07db745c94ca6bb0a591a39ba4
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate backtracking_iterator 0.4.4
[INFO] finished tweaking crates.io crate backtracking_iterator 0.4.4
[INFO] tweaked toml for crates.io crate backtracking_iterator 0.4.4 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4ce4865e1635d579d40f09a7a9bdcc9da962d36bdf6b4020dc00daef0adc3f0b
[INFO] running `Command { std: "docker" "start" "-a" "4ce4865e1635d579d40f09a7a9bdcc9da962d36bdf6b4020dc00daef0adc3f0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4ce4865e1635d579d40f09a7a9bdcc9da962d36bdf6b4020dc00daef0adc3f0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ce4865e1635d579d40f09a7a9bdcc9da962d36bdf6b4020dc00daef0adc3f0b", kill_on_drop: false }`
[INFO] [stdout] 4ce4865e1635d579d40f09a7a9bdcc9da962d36bdf6b4020dc00daef0adc3f0b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+6526e5c772f2da07db745c94ca6bb0a591a39ba4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0a67f90b6f86056571fb39bfba2fd0bd87c5012d995a19a8798fdf4fc2995572
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0a67f90b6f86056571fb39bfba2fd0bd87c5012d995a19a8798fdf4fc2995572", kill_on_drop: false }`
[INFO] [stderr]     Checking backtracking_iterator v0.4.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `Backtracking` is imported redundantly
[INFO] [stdout]   --> src/copying.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Backtracking` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 38 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Progressing` is imported redundantly
[INFO] [stdout]   --> src/copying.rs:38:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Progressing` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 38 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Backtracking` is imported redundantly
[INFO] [stdout]   --> src/referencing.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Backtracking` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Progressing` is imported redundantly
[INFO] [stdout]   --> src/referencing.rs:57:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Progressing` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BacktrackingState`
[INFO] [stdout]   --> src/concurrent.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 | use super::{BacktrackingState, BacktrackingIterator};
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Backtracking`, `Progressing`
[INFO] [stdout]   --> src/concurrent.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 72 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Backtracking`, `Progressing`
[INFO] [stdout]    --> src/concurrent.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]     |                 ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/concurrent.rs:209:26
[INFO] [stdout]     |
[INFO] [stdout] 209 |     struct Uncloneable {};
[INFO] [stdout]     |                          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Backtracking` is imported redundantly
[INFO] [stdout]   --> src/copying.rs:38:17
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Backtracking` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 38 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Progressing` is imported redundantly
[INFO] [stdout]   --> src/copying.rs:38:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Progressing` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 38 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Backtracking` is imported redundantly
[INFO] [stdout]   --> src/referencing.rs:57:17
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Backtracking` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Progressing` is imported redundantly
[INFO] [stdout]   --> src/referencing.rs:57:31
[INFO] [stdout]    |
[INFO] [stdout] 23 | use super::BacktrackingState::*;
[INFO] [stdout]    |     --------------------------- the item `Progressing` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BacktrackingState`
[INFO] [stdout]   --> src/concurrent.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 22 | use super::{BacktrackingState, BacktrackingIterator};
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Backtracking`, `Progressing`
[INFO] [stdout]   --> src/concurrent.rs:72:17
[INFO] [stdout]    |
[INFO] [stdout] 72 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]    |                 ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Backtracking`, `Progressing`
[INFO] [stdout]    --> src/concurrent.rs:140:17
[INFO] [stdout]     |
[INFO] [stdout] 140 |     use crate::{Backtracking, Progressing};
[INFO] [stdout]     |                 ^^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.33s
[INFO] running `Command { std: "docker" "inspect" "0a67f90b6f86056571fb39bfba2fd0bd87c5012d995a19a8798fdf4fc2995572", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0a67f90b6f86056571fb39bfba2fd0bd87c5012d995a19a8798fdf4fc2995572", kill_on_drop: false }`
[INFO] [stdout] 0a67f90b6f86056571fb39bfba2fd0bd87c5012d995a19a8798fdf4fc2995572