[INFO] fetching crate letter-sequence 0.6.0...
[INFO] testing letter-sequence-0.6.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate letter-sequence 0.6.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate letter-sequence 0.6.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate letter-sequence 0.6.0
[INFO] finished tweaking crates.io crate letter-sequence 0.6.0
[INFO] tweaked toml for crates.io crate letter-sequence 0.6.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate letter-sequence 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `strip` has been stabilized in the 1.58 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/profiles.html#strip-option for more information about using this feature.
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "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] d4766e9290e462bd0f3baec920c94b630156201176251a380f019ff26e00a295
[INFO] running `Command { std: "docker" "start" "-a" "d4766e9290e462bd0f3baec920c94b630156201176251a380f019ff26e00a295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d4766e9290e462bd0f3baec920c94b630156201176251a380f019ff26e00a295", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4766e9290e462bd0f3baec920c94b630156201176251a380f019ff26e00a295", kill_on_drop: false }`
[INFO] [stdout] d4766e9290e462bd0f3baec920c94b630156201176251a380f019ff26e00a295
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4497796073e252778f7c7d071bb236265ced390bce9f2d06a0ff13f6518bceb9
[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" "4497796073e252778f7c7d071bb236265ced390bce9f2d06a0ff13f6518bceb9", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `strip` has been stabilized in the 1.58 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/profiles.html#strip-option for more information about using this feature.
[INFO] [stderr]    Compiling letter-sequence v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `cur`
[INFO] [stdout]   --> src/sequence.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let cur = self.inner.clone();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_cur`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_unchecked`
[INFO] [stdout]   --> src/sequence.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/main.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use std::ops::Add;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.78s
[INFO] running `Command { std: "docker" "inspect" "4497796073e252778f7c7d071bb236265ced390bce9f2d06a0ff13f6518bceb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4497796073e252778f7c7d071bb236265ced390bce9f2d06a0ff13f6518bceb9", kill_on_drop: false }`
[INFO] [stdout] 4497796073e252778f7c7d071bb236265ced390bce9f2d06a0ff13f6518bceb9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5aa7ef60647d9ae449044c4376437150556527b18adda43eda50d2f3cb6f7b6d
[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" "5aa7ef60647d9ae449044c4376437150556527b18adda43eda50d2f3cb6f7b6d", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `strip` has been stabilized in the 1.58 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/profiles.html#strip-option for more information about using this feature.
[INFO] [stdout] warning: unused variable: `cur`
[INFO] [stdout]   --> src/sequence.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let cur = self.inner.clone();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_cur`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling letter-sequence v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `new_unchecked`
[INFO] [stdout]   --> src/sequence.rs:79:5
[INFO] [stdout]    |
[INFO] [stdout] 79 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]  --> src/main.rs:8:6
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use std::ops::Add;
[INFO] [stdout]   |         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cur`
[INFO] [stdout]   --> src/sequence.rs:38:7
[INFO] [stdout]    |
[INFO] [stdout] 38 |         let cur = self.inner.clone();
[INFO] [stdout]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_cur`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.09s
[INFO] running `Command { std: "docker" "inspect" "5aa7ef60647d9ae449044c4376437150556527b18adda43eda50d2f3cb6f7b6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5aa7ef60647d9ae449044c4376437150556527b18adda43eda50d2f3cb6f7b6d", kill_on_drop: false }`
[INFO] [stdout] 5aa7ef60647d9ae449044c4376437150556527b18adda43eda50d2f3cb6f7b6d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] a48b5f6486132140adfdd43c880d6cb2a1be58c392b36707fbf0a687a7f96ec6
[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" "a48b5f6486132140adfdd43c880d6cb2a1be58c392b36707fbf0a687a7f96ec6", kill_on_drop: false }`
[INFO] [stderr] warning: the cargo feature `strip` has been stabilized in the 1.58 release and is no longer necessary to be listed in the manifest
[INFO] [stderr]   See https://doc.rust-lang.org/cargo/reference/profiles.html#strip-option for more information about using this feature.
[INFO] [stderr] warning: unused variable: `cur`
[INFO] [stderr]   --> src/sequence.rs:38:7
[INFO] [stderr]    |
[INFO] [stderr] 38 |         let cur = self.inner.clone();
[INFO] [stderr]    |             ^^^ help: if this is intentional, prefix it with an underscore: `_cur`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new_unchecked`
[INFO] [stderr]   --> src/sequence.rs:79:5
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn new_unchecked(inner: u64) -> Self {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (lib) generated 2 warnings
[INFO] [stderr] warning: `letter-sequence` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr] warning: unused import: `std::ops::Add`
[INFO] [stderr]  --> src/main.rs:8:6
[INFO] [stderr]   |
[INFO] [stderr] 8 |     use std::ops::Add;
[INFO] [stderr]   |         ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (bin "letter-sequence" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/letter_sequence-5a0044ebdf48c758)
[INFO] [stdout] running 10 tests
[INFO] [stdout] test sequence::builder::test::max_render_capacity ... ok
[INFO] [stdout] test sequence::test::default ... ok
[INFO] [stdout] test sequence::helper::test::char::simple ... ok
[INFO] [stdout] test sequence::test::lower ... ok
[INFO] [stdout] test sequence::test::new_unchecked ... ok
[INFO] [stdout] test sequence::test::rollover ... ok
[INFO] [stdout] test sequence::test::upper ... ok
[INFO] [stdout] test sequence::builder::test::simple ... ok
[INFO] [stdout] test sequence::test::num ... ok
[INFO] [stdout] test sequence::builder::test::rollover ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 4.13s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/letter_sequence-697dc2e1978f56cc)
[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 letter-sequence
[INFO] [stdout] 
[INFO] [stdout] running 20 tests
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_char (line 36) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder::new (line 99) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder::max_render_capacity (line 115) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 40) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::char_to_int (line 53) ... ok
[INFO] [stdout] test src/sequence.rs - sequence::Sequence (line 49) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 187) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 23) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 6) ... ok
[INFO] [stdout] test src/lib.rs - sequence (line 32) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::string_to_int (line 70) ... ok
[INFO] [stdout] test src/lib.rs - sequence (line 13) ... ok
[INFO] [stdout] test src/sequence/combined.rs - sequence::combined::CombinedSequence (line 16) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_string (line 6) ... ok
[INFO] [stdout] test src/lib.rs - sequence (line 47) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 53) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_alpha (line 151) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::RenderDisplay (line 19) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_numeric (line 169) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::SeqRenderer::render (line 68) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 20 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 8.25s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "a48b5f6486132140adfdd43c880d6cb2a1be58c392b36707fbf0a687a7f96ec6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a48b5f6486132140adfdd43c880d6cb2a1be58c392b36707fbf0a687a7f96ec6", kill_on_drop: false }`
[INFO] [stdout] a48b5f6486132140adfdd43c880d6cb2a1be58c392b36707fbf0a687a7f96ec6