[INFO] fetching crate letter-sequence 0.1.0...
[INFO] testing letter-sequence-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate letter-sequence 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate letter-sequence 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate letter-sequence 0.1.0
[INFO] finished tweaking crates.io crate letter-sequence 0.1.0
[INFO] tweaked toml for crates.io crate letter-sequence 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate letter-sequence 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "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] 732c17fa393e2c6afe966dbdd7c0e3f44b085c6851544b6fa17dfd76797794b1
[INFO] running `Command { std: "docker" "start" "-a" "732c17fa393e2c6afe966dbdd7c0e3f44b085c6851544b6fa17dfd76797794b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "732c17fa393e2c6afe966dbdd7c0e3f44b085c6851544b6fa17dfd76797794b1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "732c17fa393e2c6afe966dbdd7c0e3f44b085c6851544b6fa17dfd76797794b1", kill_on_drop: false }`
[INFO] [stdout] 732c17fa393e2c6afe966dbdd7c0e3f44b085c6851544b6fa17dfd76797794b1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 038577c997572572e50245ee89b917c27a16f07287374e13b15834d64e1a533e
[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" "038577c997572572e50245ee89b917c27a16f07287374e13b15834d64e1a533e", kill_on_drop: false }`
[INFO] [stderr]    Compiling letter-sequence v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/sequence/builder.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn new_from_string(start: &str) -> () {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/sequence.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn new(x: u64) -> Result<Self, SequenceError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_unchecked`
[INFO] [stdout]   --> src/sequence.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn new_unchecked(x: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `A`
[INFO] [stdout]   --> src/lib.rs:51:1
[INFO] [stdout]    |
[INFO] [stdout] 51 | const A: u32  = 0;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.94s
[INFO] running `Command { std: "docker" "inspect" "038577c997572572e50245ee89b917c27a16f07287374e13b15834d64e1a533e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "038577c997572572e50245ee89b917c27a16f07287374e13b15834d64e1a533e", kill_on_drop: false }`
[INFO] [stdout] 038577c997572572e50245ee89b917c27a16f07287374e13b15834d64e1a533e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f886501657ed8a70c39b314f99c5f0e005888ee866281ac6647d951d30838868
[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" "f886501657ed8a70c39b314f99c5f0e005888ee866281ac6647d951d30838868", kill_on_drop: false }`
[INFO] [stderr]    Compiling letter-sequence v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/sequence/builder.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn new_from_string(start: &str) -> () {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/sequence.rs:29:5
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn new(x: u64) -> Result<Self, SequenceError> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new_unchecked`
[INFO] [stdout]   --> src/sequence.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     fn new_unchecked(x: u64) -> Self {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `A`
[INFO] [stdout]   --> src/lib.rs:51:1
[INFO] [stdout]    |
[INFO] [stdout] 51 | const A: u32  = 0;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::sequence::renderer::*`
[INFO] [stdout]   --> src/sequence.rs:64:6
[INFO] [stdout]    |
[INFO] [stdout] 64 |     use crate::sequence::renderer::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `start`
[INFO] [stdout]   --> src/sequence/builder.rs:52:25
[INFO] [stdout]    |
[INFO] [stdout] 52 |     pub fn new_from_string(start: &str) -> () {
[INFO] [stdout]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.54s
[INFO] running `Command { std: "docker" "inspect" "f886501657ed8a70c39b314f99c5f0e005888ee866281ac6647d951d30838868", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f886501657ed8a70c39b314f99c5f0e005888ee866281ac6647d951d30838868", kill_on_drop: false }`
[INFO] [stdout] f886501657ed8a70c39b314f99c5f0e005888ee866281ac6647d951d30838868
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] bb39fec83638211d942a345e2279c576554e3c371a6531678317834822bcc216
[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" "bb39fec83638211d942a345e2279c576554e3c371a6531678317834822bcc216", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `start`
[INFO] [stdout] running 11 tests
[INFO] [stderr]   --> src/sequence/builder.rs:52:25
[INFO] [stdout] test sequence::builder::test::bounds ... ok
[INFO] [stderr]    |
[INFO] [stdout] test sequence::helper::test::char::simple ... ok
[INFO] [stderr] 52 |     pub fn new_from_string(start: &str) -> () {
[INFO] [stderr]    |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_start`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/sequence.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     fn new(x: u64) -> Result<Self, SequenceError> {
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new_unchecked`
[INFO] [stderr]   --> src/sequence.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn new_unchecked(x: u64) -> Self {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `A`
[INFO] [stderr]   --> src/lib.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | const A: u32  = 0;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (lib) generated 4 warnings
[INFO] [stderr] warning: unused import: `crate::sequence::renderer::*`
[INFO] [stderr]   --> src/sequence.rs:64:6
[INFO] [stderr]    |
[INFO] [stderr] 64 |     use crate::sequence::renderer::*;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `letter-sequence` (lib test) generated 2 warnings (1 duplicate)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/letter_sequence-7f529d9ead6453d0)
[INFO] [stdout] test sequence::test::rollover ... ok
[INFO] [stdout] test sequence::test::lower ... ok
[INFO] [stdout] test sequence::test::upper ... ok
[INFO] [stdout] test sequence::test::default ... ok
[INFO] [stdout] test sequence::test::new ... ok
[INFO] [stdout] test sequence::test::new_unchecked ... ok
[INFO] [stdout] test sequence::test::num ... ok
[INFO] [stdout] test sequence::builder::test::simple ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/letter_sequence-97091424ba373c47)
[INFO] [stdout] test sequence::builder::test::rollover ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.30s
[INFO] [stdout] 
[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 10 tests
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_char (line 36) ... ok
[INFO] [stdout] test src/lib.rs - (line 18) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_numeric (line 69) ... ok
[INFO] [stdout] test src/lib.rs - (line 31) ... ok
[INFO] [stdout] test src/sequence/helper.rs - sequence::helper::int_to_string (line 6) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 16) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder::new (line 43) ... ok
[INFO] [stdout] test src/lib.rs - (line 2) ... ok
[INFO] [stdout] test src/sequence/builder.rs - sequence::builder::SequenceBuilder (line 3) ... ok
[INFO] [stdout] test src/sequence/renderer.rs - sequence::renderer::max_alpha (line 53) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.29s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "bb39fec83638211d942a345e2279c576554e3c371a6531678317834822bcc216", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb39fec83638211d942a345e2279c576554e3c371a6531678317834822bcc216", kill_on_drop: false }`
[INFO] [stdout] bb39fec83638211d942a345e2279c576554e3c371a6531678317834822bcc216