[INFO] fetching crate sweeper 1.0.0-rc3...
[INFO] testing sweeper-1.0.0-rc3 against try#33835004928d3bf65db4d4712e1330766263b0bd for pr-155739-1
[INFO] extracting crate sweeper 1.0.0-rc3 into /workspace/builds/worker-3-tc2/source
[INFO] started tweaking crates.io crate sweeper 1.0.0-rc3
[INFO] finished tweaking crates.io crate sweeper 1.0.0-rc3
[INFO] tweaked toml for crates.io crate sweeper 1.0.0-rc3 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate sweeper 1.0.0-rc3 on toolchain 33835004928d3bf65db4d4712e1330766263b0bd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 18 packages to latest compatible versions
[INFO] [stderr]       Adding rand v0.7.3 (available: v0.10.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f62409039991ebb439cf0aa8be59bd0483526d1a3343bb7ce9084c4e56605db
[INFO] running `Command { std: "docker" "start" "-a" "8f62409039991ebb439cf0aa8be59bd0483526d1a3343bb7ce9084c4e56605db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f62409039991ebb439cf0aa8be59bd0483526d1a3343bb7ce9084c4e56605db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f62409039991ebb439cf0aa8be59bd0483526d1a3343bb7ce9084c4e56605db", kill_on_drop: false }`
[INFO] [stdout] 8f62409039991ebb439cf0aa8be59bd0483526d1a3343bb7ce9084c4e56605db
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 113681ef211541176093a0b7376978359266a674c05ff5c22445cb80f4c72963
[INFO] running `Command { std: "docker" "start" "-a" "113681ef211541176093a0b7376978359266a674c05ff5c22445cb80f4c72963", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]    Compiling zerocopy v0.8.48
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling sweeper v1.0.0-rc3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/field.rs:575:49
[INFO] [stdout]     |
[INFO] [stdout] 575 |         enum StructField { Storage, Dimensions };
[INFO] [stdout]     |                                                 ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/field.rs:552:5
[INFO] [stdout]     |
[INFO] [stdout] 552 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^ help: remove this attribute
[INFO] [stdout]     |
[INFO] [stdout] note: attribute also specified here
[INFO] [stdout]    --> src/field.rs:547:5
[INFO] [stdout]     |
[INFO] [stdout] 547 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:433:21
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<Ct, Cf>> {
[INFO] [stdout]     |                     ^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:438:25
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<Ct, Cf>> {
[INFO] [stdout]     |                         ^^^^^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.57s
[INFO] running `Command { std: "docker" "inspect" "113681ef211541176093a0b7376978359266a674c05ff5c22445cb80f4c72963", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "113681ef211541176093a0b7376978359266a674c05ff5c22445cb80f4c72963", kill_on_drop: false }`
[INFO] [stdout] 113681ef211541176093a0b7376978359266a674c05ff5c22445cb80f4c72963
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b10202c525eebadb7d0ae0ee7a5c4ff0117bb254d293e37c7ea85bfdd6c1bc4
[INFO] running `Command { std: "docker" "start" "-a" "5b10202c525eebadb7d0ae0ee7a5c4ff0117bb254d293e37c7ea85bfdd6c1bc4", kill_on_drop: false }`
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/field.rs:575:49
[INFO] [stdout]     |
[INFO] [stdout] 575 |         enum StructField { Storage, Dimensions };
[INFO] [stdout]     |                                                 ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/field.rs:552:5
[INFO] [stdout]     |
[INFO] [stdout] 552 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^ help: remove this attribute
[INFO] [stdout]     |
[INFO] [stdout] note: attribute also specified here
[INFO] [stdout]    --> src/field.rs:547:5
[INFO] [stdout]     |
[INFO] [stdout] 547 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:433:21
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<Ct, Cf>> {
[INFO] [stdout]     |                     ^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling sweeper v1.0.0-rc3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:438:25
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<Ct, Cf>> {
[INFO] [stdout]     |                         ^^^^^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/field.rs:575:49
[INFO] [stdout]     |
[INFO] [stdout] 575 |         enum StructField { Storage, Dimensions };
[INFO] [stdout]     |                                                 ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused attribute
[INFO] [stdout]    --> src/field.rs:552:5
[INFO] [stdout]     |
[INFO] [stdout] 552 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^ help: remove this attribute
[INFO] [stdout]     |
[INFO] [stdout] note: attribute also specified here
[INFO] [stdout]    --> src/field.rs:547:5
[INFO] [stdout]     |
[INFO] [stdout] 547 |     #[inline(always)]
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:433:21
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<Ct, Cf>> {
[INFO] [stdout]     |                     ^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/field.rs:438:25
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<Ct, Cf>> {
[INFO] [stdout]     |                         ^^^^^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<'_, Ct, Cf>> {
[INFO] [stdout]     |                                                                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.56s
[INFO] running `Command { std: "docker" "inspect" "5b10202c525eebadb7d0ae0ee7a5c4ff0117bb254d293e37c7ea85bfdd6c1bc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b10202c525eebadb7d0ae0ee7a5c4ff0117bb254d293e37c7ea85bfdd6c1bc4", kill_on_drop: false }`
[INFO] [stdout] 5b10202c525eebadb7d0ae0ee7a5c4ff0117bb254d293e37c7ea85bfdd6c1bc4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+33835004928d3bf65db4d4712e1330766263b0bd" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ea26abdb0145bcbd3230be95cdcac79dc78978504ebe266d4d33ff65137a2276
[INFO] running `Command { std: "docker" "start" "-a" "ea26abdb0145bcbd3230be95cdcac79dc78978504ebe266d4d33ff65137a2276", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/field.rs:575:49
[INFO] [stderr]     |
[INFO] [stderr] 575 |         enum StructField { Storage, Dimensions };
[INFO] [stderr]     |                                                 ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused attribute
[INFO] [stderr]    --> src/field.rs:552:5
[INFO] [stderr]     |
[INFO] [stderr] 552 |     #[inline(always)]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^ help: remove this attribute
[INFO] [stderr]     |
[INFO] [stderr] note: attribute also specified here
[INFO] [stderr]    --> src/field.rs:547:5
[INFO] [stderr]     |
[INFO] [stderr] 547 |     #[inline(always)]
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stderr]     = note: `#[warn(unused_attributes)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/field.rs:433:21
[INFO] [stderr]     |
[INFO] [stderr] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<Ct, Cf>> {
[INFO] [stderr]     |                     ^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 433 |     pub fn clearing(&self, anchor_location: FieldCoordinates) -> Option<Clearing<'_, Ct, Cf>> {
[INFO] [stderr]     |                                                                                  +++
[INFO] [stderr] 
[INFO] [stderr] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stderr]    --> src/field.rs:438:25
[INFO] [stderr]     |
[INFO] [stderr] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<Ct, Cf>> {
[INFO] [stderr]     |                         ^^^^^^^^^ the lifetime is elided here                   ^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stderr]     |
[INFO] [stderr]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stderr] help: use `'_` for type paths
[INFO] [stderr]     |
[INFO] [stderr] 438 |     pub fn clearing_mut(&mut self, anchor_location: FieldCoordinates) -> Option<ClearingMut<'_, Ct, Cf>> {
[INFO] [stderr]     |                                                                                             +++
[INFO] [stderr] 
[INFO] [stderr] warning: `sweeper` (lib) generated 4 warnings (run `cargo fix --lib -p sweeper` to apply 3 suggestions)
[INFO] [stderr] warning: `sweeper` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/sweeper-280519d766cf85af)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests sweeper
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/field.rs:575:49
[INFO] [stderr]     |
[INFO] [stderr] 575 |         enum StructField { Storage, Dimensions };
[INFO] [stderr]     |                                                 ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/iter.rs - iter::ColumnIter (line 132) ... ok
[INFO] [stdout] test src/iter.rs - iter::RowIter (line 28) ... ok
[INFO] [stdout] test src/iter.rs - iter::FieldColumnsIter (line 296) ... FAILED
[INFO] [stdout] test src/iter.rs - iter::FieldRowsIter (line 230) ... ok
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/iter.rs - iter::FieldColumnsIter (line 296) stdout ----
[INFO] [stdout] Test executable failed (signal: 6 (SIGABRT) (core dumped)).
[INFO] [stdout] 
[INFO] [stdout] stderr:
[INFO] [stdout] 
[INFO] [stdout] thread 'main' (108) panicked at src/field.rs:238:34:
[INFO] [stdout] unsafe precondition(s) violated: slice::get_unchecked requires that the index is within the slice
[INFO] [stdout] 
[INFO] [stdout] This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.
[INFO] [stdout] stack backtrace:
[INFO] [stdout]    0:     0x5bbe469d37da - std[ec419fa8110287d5]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stdout]    1:     0x5bbe469d37da - std[ec419fa8110287d5]::backtrace_rs::backtrace::trace_unsynchronized::<std[ec419fa8110287d5]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stdout]    2:     0x5bbe469d37da - std[ec419fa8110287d5]::sys::backtrace::_print_fmt
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/sys/backtrace.rs:74:9
[INFO] [stdout]    3:     0x5bbe469d37da - <<std[ec419fa8110287d5]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[35159d6ffb30e017]::fmt::Display>::fmt
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/sys/backtrace.rs:44:26
[INFO] [stdout]    4:     0x5bbe469e36aa - <core[35159d6ffb30e017]::fmt::rt::Argument>::fmt
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/core/src/fmt/rt.rs:152:76
[INFO] [stdout]    5:     0x5bbe469e36aa - core[35159d6ffb30e017]::fmt::write
[INFO] [stdout]    6:     0x5bbe469d6b12 - std[ec419fa8110287d5]::io::default_write_fmt::<std[ec419fa8110287d5]::sys::stdio::unix::Stderr>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/io/mod.rs:621:11
[INFO] [stdout]    7:     0x5bbe469d6b12 - <std[ec419fa8110287d5]::sys::stdio::unix::Stderr as std[ec419fa8110287d5]::io::Write>::write_fmt
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/io/mod.rs:1976:13
[INFO] [stdout]    8:     0x5bbe469bf69f - <std[ec419fa8110287d5]::sys::backtrace::BacktraceLock>::print
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/sys/backtrace.rs:47:9
[INFO] [stdout]    9:     0x5bbe469bf69f - std[ec419fa8110287d5]::panicking::default_hook::{closure#0}
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:292:27
[INFO] [stdout]   10:     0x5bbe469cfda1 - std[ec419fa8110287d5]::panicking::default_hook
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:319:9
[INFO] [stdout]   11:     0x5bbe469cff5b - std[ec419fa8110287d5]::panicking::panic_with_hook
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:825:13
[INFO] [stdout]   12:     0x5bbe469bf78a - std[ec419fa8110287d5]::panicking::panic_handler::{closure#0}
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:691:13
[INFO] [stdout]   13:     0x5bbe469b74d9 - std[ec419fa8110287d5]::sys::backtrace::__rust_end_short_backtrace::<std[ec419fa8110287d5]::panicking::panic_handler::{closure#0}, !>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/sys/backtrace.rs:182:18
[INFO] [stdout]   14:     0x5bbe469bff3d - __rustc[cfb3622dd870db93]::rust_begin_unwind
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:689:5
[INFO] [stdout]   15:     0x5bbe469e3c1d - core[35159d6ffb30e017]::panicking::panic_nounwind_fmt::runtime
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/core/src/panicking.rs:122:22
[INFO] [stdout]   16:     0x5bbe469e3c1d - core[35159d6ffb30e017]::panicking::panic_nounwind_fmt
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/core/src/intrinsics/mod.rs:2450:9
[INFO] [stdout]   17:     0x5bbe469a95f2 - <usize as core[35159d6ffb30e017]::slice::index::SliceIndex<[_]>>::get_unchecked::precondition_check
[INFO] [stdout]   18:     0x5bbe469a974e - <usize as core[35159d6ffb30e017]::slice::index::SliceIndex<[sweeper[37a22d95041156fa]::tile::Tile<(), ()>]>>::get_unchecked
[INFO] [stdout]   19:     0x5bbe469a8984 - <[sweeper[37a22d95041156fa]::tile::Tile<(), ()>]>::get_unchecked::<usize>
[INFO] [stdout]   20:     0x5bbe469a912e - <sweeper[37a22d95041156fa]::field::Field<(), ()>>::get
[INFO] [stdout]   21:     0x5bbe469a98a7 - <sweeper[37a22d95041156fa]::iter::ColumnIter<(), ()> as core[35159d6ffb30e017]::iter::traits::iterator::Iterator>::next
[INFO] [stdout]   22:     0x5bbe469a8ae8 - <sweeper[37a22d95041156fa]::iter::ColumnIter<(), ()> as core[35159d6ffb30e017]::iter::traits::iterator::Iterator>::try_fold::<(), core[35159d6ffb30e017]::iter::traits::iterator::Iterator::find::check<&sweeper[37a22d95041156fa]::tile::Tile<(), ()>, rust_out[999a937b1cc8d0f6]::main::_doctest_main_src_iter_rs_296_0::{closure#0}>::{closure#0}, core[35159d6ffb30e017]::ops::control_flow::ControlFlow<&sweeper[37a22d95041156fa]::tile::Tile<(), ()>>>
[INFO] [stdout]   23:     0x5bbe469a8a69 - <sweeper[37a22d95041156fa]::iter::ColumnIter<(), ()> as core[35159d6ffb30e017]::iter::traits::iterator::Iterator>::find::<rust_out[999a937b1cc8d0f6]::main::_doctest_main_src_iter_rs_296_0::{closure#0}>
[INFO] [stdout]   24:     0x5bbe469a94d6 - rust_out[999a937b1cc8d0f6]::main::_doctest_main_src_iter_rs_296_0
[INFO] [stdout]   25:     0x5bbe469a8c86 - rust_out[999a937b1cc8d0f6]::main
[INFO] [stdout]   26:     0x5bbe469a9e03 - <fn() as core[35159d6ffb30e017]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]   27:     0x5bbe469a8a56 - std[ec419fa8110287d5]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
[INFO] [stdout]   28:     0x5bbe469a8be9 - std[ec419fa8110287d5]::rt::lang_start::<()>::{closure#0}
[INFO] [stdout]   29:     0x5bbe469cf527 - <&dyn core[35159d6ffb30e017]::ops::function::Fn<(), Output = i32> + core[35159d6ffb30e017]::marker::Sync + core[35159d6ffb30e017]::panic::unwind_safe::RefUnwindSafe as core[35159d6ffb30e017]::ops::function::FnOnce<()>>::call_once
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/core/src/ops/function.rs:287:21
[INFO] [stdout]   30:     0x5bbe469cf527 - std[ec419fa8110287d5]::panicking::catch_unwind::do_call::<&dyn core[35159d6ffb30e017]::ops::function::Fn<(), Output = i32> + core[35159d6ffb30e017]::marker::Sync + core[35159d6ffb30e017]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:581:40
[INFO] [stdout]   31:     0x5bbe469cf527 - std[ec419fa8110287d5]::panicking::catch_unwind::<i32, &dyn core[35159d6ffb30e017]::ops::function::Fn<(), Output = i32> + core[35159d6ffb30e017]::marker::Sync + core[35159d6ffb30e017]::panic::unwind_safe::RefUnwindSafe>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:544:19
[INFO] [stdout]   32:     0x5bbe469cf527 - std[ec419fa8110287d5]::panic::catch_unwind::<&dyn core[35159d6ffb30e017]::ops::function::Fn<(), Output = i32> + core[35159d6ffb30e017]::marker::Sync + core[35159d6ffb30e017]::panic::unwind_safe::RefUnwindSafe, i32>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panic.rs:359:14
[INFO] [stdout]   33:     0x5bbe469cf527 - std[ec419fa8110287d5]::rt::lang_start_internal::{closure#0}
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/rt.rs:175:24
[INFO] [stdout]   34:     0x5bbe469cf527 - std[ec419fa8110287d5]::panicking::catch_unwind::do_call::<std[ec419fa8110287d5]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:581:40
[INFO] [stdout]   35:     0x5bbe469cf527 - std[ec419fa8110287d5]::panicking::catch_unwind::<isize, std[ec419fa8110287d5]::rt::lang_start_internal::{closure#0}>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panicking.rs:544:19
[INFO] [stdout]   36:     0x5bbe469cf527 - std[ec419fa8110287d5]::panic::catch_unwind::<std[ec419fa8110287d5]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/panic.rs:359:14
[INFO] [stdout]   37:     0x5bbe469cf527 - std[ec419fa8110287d5]::rt::lang_start_internal
[INFO] [stdout]                                at /rustc/33835004928d3bf65db4d4712e1330766263b0bd/library/std/src/rt.rs:171:5
[INFO] [stdout]   38:     0x5bbe469a8a41 - std[ec419fa8110287d5]::rt::lang_start::<()>
[INFO] [stdout]   39:     0x5bbe469a9e95 - main
[INFO] [stdout]   40:     0x73e969e751ca - <unknown>
[INFO] [stdout]   41:     0x73e969e7528b - __libc_start_main
[INFO] [stdout]   42:     0x5bbe469a88a5 - _start
[INFO] [stdout]   43:                0x0 - <unknown>
[INFO] [stdout] thread caused non-unwinding panic. aborting.
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/iter.rs - iter::FieldColumnsIter (line 296)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 3 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.77s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "ea26abdb0145bcbd3230be95cdcac79dc78978504ebe266d4d33ff65137a2276", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea26abdb0145bcbd3230be95cdcac79dc78978504ebe266d4d33ff65137a2276", kill_on_drop: false }`
[INFO] [stdout] ea26abdb0145bcbd3230be95cdcac79dc78978504ebe266d4d33ff65137a2276
