[INFO] cloning repository https://github.com/Hoverbear/rust-rosetta
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Hoverbear/rust-rosetta" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHoverbear%2Frust-rosetta", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHoverbear%2Frust-rosetta'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a86f82a94d496a469f96714131c111c21631576b
[INFO] checking Hoverbear/rust-rosetta against 1.55.0 for beta-1.56-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FHoverbear%2Frust-rosetta" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Hoverbear/rust-rosetta 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] removed /workspace/builds/worker-11/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/Hoverbear/rust-rosetta
[INFO] finished tweaking git repo https://github.com/Hoverbear/rust-rosetta
[INFO] tweaked toml for git repo https://github.com/Hoverbear/rust-rosetta written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Hoverbear/rust-rosetta 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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] [stdout] 11079faa4999bf977e10cddacebe2c8ea36568ce236d226ffa68e620fd90749f
[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" "11079faa4999bf977e10cddacebe2c8ea36568ce236d226ffa68e620fd90749f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "11079faa4999bf977e10cddacebe2c8ea36568ce236d226ffa68e620fd90749f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11079faa4999bf977e10cddacebe2c8ea36568ce236d226ffa68e620fd90749f", kill_on_drop: false }`
[INFO] [stdout] 11079faa4999bf977e10cddacebe2c8ea36568ce236d226ffa68e620fd90749f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 85987247ab5dcaf37967cfcbf4961051a53dce203e4f5c9e21b2f5549c4ba83f
[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" "85987247ab5dcaf37967cfcbf4961051a53dce203e4f5c9e21b2f5549c4ba83f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.87
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]     Checking futures-core v0.3.13
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[INFO] [stderr]    Compiling matrixmultiply v0.1.15
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[INFO] [stderr]     Checking prime-decomposition v0.1.0 (/opt/rustwide/workdir/tasks/prime-decomposition)
[INFO] [stderr]    Compiling ndarray v0.14.0
[INFO] [stderr]     Checking entropy v0.1.0 (/opt/rustwide/workdir/tasks/entropy)
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[INFO] [stderr]    Compiling doc-comment v0.3.3
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[INFO] [stderr]     Checking takeable-option v0.5.0
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[INFO] [stderr]     Checking implementation v0.1.0 (/opt/rustwide/workdir/tasks/md5/implementation)
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[INFO] [stderr]     Checking the-twelve-days-of-christmas v0.1.0 (/opt/rustwide/workdir/tasks/the-twelve-days-of-christmas)
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[INFO] [stderr]     Checking integer v0.1.0 (/opt/rustwide/workdir/tasks/arithmetic/integer)
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[INFO] [stderr]     Checking create-a-file v0.1.0 (/opt/rustwide/workdir/tasks/create-a-file)
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[INFO] [stderr]     Checking hofstadter-q-sequence v0.1.0 (/opt/rustwide/workdir/tasks/hofstadter-q-sequence)
[INFO] [stderr]     Checking greatest-subsequential-sum v0.1.0 (/opt/rustwide/workdir/tasks/greatest-subsequential-sum)
[INFO] [stderr]     Checking mouse-position v0.1.0 (/opt/rustwide/workdir/tasks/mouse-position)
[INFO] [stderr]     Checking align-columns v0.1.0 (/opt/rustwide/workdir/tasks/align-columns)
[INFO] [stderr]     Checking bitwise-operations v0.1.0 (/opt/rustwide/workdir/tasks/bitwise-operations)
[INFO] [stderr]     Checking with-feedback-player v0.1.0 (/opt/rustwide/workdir/tasks/guess-the-number/with-feedback-player)
[INFO] [stderr]     Checking modular-inverse v0.1.0 (/opt/rustwide/workdir/tasks/modular-inverse)
[INFO] [stderr]     Checking circles-of-given-radius-through-two-points v0.1.0 (/opt/rustwide/workdir/tasks/circles-of-given-radius-through-two-points)
[INFO] [stderr]     Checking spiral-matrix v0.1.0 (/opt/rustwide/workdir/tasks/spiral-matrix)
[INFO] [stderr]     Checking newline-omission v0.1.0 (/opt/rustwide/workdir/tasks/hello-world/newline-omission)
[INFO] [stderr]     Checking hash-from-two-arrays v0.1.0 (/opt/rustwide/workdir/tasks/hash-from-two-arrays)
[INFO] [stderr]     Checking currying v0.1.0 (/opt/rustwide/workdir/tasks/currying)
[INFO] [stderr]     Checking narcissistic-decimal-number v0.1.0 (/opt/rustwide/workdir/tasks/narcissistic-decimal-number)
[INFO] [stderr]     Checking merge-sort v0.1.0 (/opt/rustwide/workdir/tasks/sorting-algorithms/merge-sort)
[INFO] [stderr]     Checking sort-disjoint-sublist v0.1.0 (/opt/rustwide/workdir/tasks/sort-disjoint-sublist)
[INFO] [stderr]     Checking sort-an-array-of-composite-structures v0.1.0 (/opt/rustwide/workdir/tasks/sort-an-array-of-composite-structures)
[INFO] [stderr]     Checking even-or-odd v0.1.0 (/opt/rustwide/workdir/tasks/even-or-odd)
[INFO] [stderr]     Checking while v0.1.0 (/opt/rustwide/workdir/tasks/loops/while)
[INFO] [stderr]     Checking arrays v0.1.0 (/opt/rustwide/workdir/tasks/arrays)
[INFO] [stderr]     Checking associative-array-creation v0.1.0 (/opt/rustwide/workdir/tasks/associative-array/creation)
[INFO] [stderr]     Checking caesar-cipher v0.1.0 (/opt/rustwide/workdir/tasks/caesar-cipher)
[INFO] [stderr]     Checking line-printer v0.1.0 (/opt/rustwide/workdir/tasks/hello-world/line-printer)
[INFO] [stderr]     Checking hofstadter-figure-figure-sequences v0.1.0 (/opt/rustwide/workdir/tasks/hofstadter-figure-figure-sequences)
[INFO] [stderr]     Checking middle-three-digits v0.1.0 (/opt/rustwide/workdir/tasks/middle-three-digits)
[INFO] [stderr]     Checking balanced-ternary v0.1.0 (/opt/rustwide/workdir/tasks/balanced-ternary)
[INFO] [stderr]     Checking hash-join v0.1.0 (/opt/rustwide/workdir/tasks/hash-join)
[INFO] [stderr]     Checking sum-of-squares v0.1.0 (/opt/rustwide/workdir/tasks/sum-of-squares)
[INFO] [stderr]     Checking rename-a-file v0.1.0 (/opt/rustwide/workdir/tasks/rename-a-file)
[INFO] [stderr]     Checking letter-frequency v0.1.0 (/opt/rustwide/workdir/tasks/letter-frequency)
[INFO] [stderr]     Checking temperature-conversion v0.1.0 (/opt/rustwide/workdir/tasks/temperature-conversion)
[INFO] [stderr]     Checking repeat-a-string v0.1.0 (/opt/rustwide/workdir/tasks/repeat-a-string)
[INFO] [stderr]     Checking combinations-with-repetitions v0.1.0 (/opt/rustwide/workdir/tasks/combinations-with-repetitions)
[INFO] [stderr]     Checking read-entire-file v0.1.0 (/opt/rustwide/workdir/tasks/read-entire-file)
[INFO] [stderr]     Checking vampire-number v0.1.0 (/opt/rustwide/workdir/tasks/vampire-number)
[INFO] [stderr]     Checking fasta-format v0.1.0 (/opt/rustwide/workdir/tasks/fasta-format)
[INFO] [stderr]     Checking ethiopian-multiplication v0.1.0 (/opt/rustwide/workdir/tasks/ethiopian-multiplication)
[INFO] [stderr]     Checking compound-data-type v0.1.0 (/opt/rustwide/workdir/tasks/compound-data-type)
[INFO] [stderr]     Checking map-range v0.1.0 (/opt/rustwide/workdir/tasks/map-range)
[INFO] [stderr]     Checking vigenere-cipher v0.1.0 (/opt/rustwide/workdir/tasks/vigenere-cipher)
[INFO] [stderr]     Checking mean-angle v0.1.0 (/opt/rustwide/workdir/tasks/averages/mean-angle)
[INFO] [stderr]     Checking apply-a-callback-to-an-array v0.1.0 (/opt/rustwide/workdir/tasks/apply-a-callback-to-an-array)
[INFO] [stderr]     Checking substring-top-and-tail v0.1.0 (/opt/rustwide/workdir/tasks/substring/top-and-tail)
[INFO] [stderr]     Checking digital-root v0.1.0 (/opt/rustwide/workdir/tasks/digital-root)
[INFO] [stderr]     Checking wireworld v0.1.0 (/opt/rustwide/workdir/tasks/wireworld)
[INFO] [stderr]     Checking sum-digits-of-an-integer v0.1.0 (/opt/rustwide/workdir/tasks/sum-digits-of-an-integer)
[INFO] [stderr]     Checking power-set v0.1.0 (/opt/rustwide/workdir/tasks/power-set)
[INFO] [stderr]     Checking sort-an-integer-array v0.1.0 (/opt/rustwide/workdir/tasks/sort-an-integer-array)
[INFO] [stderr]     Checking hofstadter-conway v0.1.0 (/opt/rustwide/workdir/tasks/hofstadter-conway)
[INFO] [stderr]     Checking abundant-deficient-and-perfect-number-classifications v0.1.0 (/opt/rustwide/workdir/tasks/abundant-deficient-and-perfect-number-classifications)
[INFO] [stderr]     Checking text v0.1.0 (/opt/rustwide/workdir/tasks/user-input/text)
[INFO] [stderr]     Checking string-matching v0.1.0 (/opt/rustwide/workdir/tasks/string-matching)
[INFO] [stderr]     Checking sedols v0.1.0 (/opt/rustwide/workdir/tasks/sedols)
[INFO] [stderr]     Checking search-a-list v0.1.0 (/opt/rustwide/workdir/tasks/search-a-list)
[INFO] [stderr]     Checking count-occurrences-of-a-substring v0.1.0 (/opt/rustwide/workdir/tasks/count-occurrences-of-a-substring)
[INFO] [stderr]     Checking newbie v0.1.0 (/opt/rustwide/workdir/tasks/hello-world/newbie)
[INFO] [stderr]     Checking burrows-wheeler-transform v0.1.0 (/opt/rustwide/workdir/tasks/burrows-wheeler-transform)
[INFO] [stderr]     Checking josephus-problem v0.1.0 (/opt/rustwide/workdir/tasks/josephus-problem)
[INFO] [stderr]     Checking case-sensitivity-of-identifiers v0.1.0 (/opt/rustwide/workdir/tasks/case-sensitivity-of-identifiers)
[INFO] [stderr]     Checking truncate-a-file v0.1.0 (/opt/rustwide/workdir/tasks/truncate-a-file)
[INFO] [stderr]     Checking phrase-reversals v0.1.0 (/opt/rustwide/workdir/tasks/phrase-reversals)
[INFO] [stderr]     Checking cheryl-birthday v0.1.0 (/opt/rustwide/workdir/tasks/cheryl-birthday)
[INFO] [stderr]     Checking ackermann-function v0.1.0 (/opt/rustwide/workdir/tasks/ackermann-function)
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/rustwide/workdir/tasks/sudoku)
[INFO] [stderr]     Checking catalan-numbers v0.1.0 (/opt/rustwide/workdir/tasks/catalan-numbers)
[INFO] [stderr]     Checking environment-variables v0.1.0 (/opt/rustwide/workdir/tasks/environment-variables)
[INFO] [stderr]     Checking padovan-n-step-number-sequences v0.1.0 (/opt/rustwide/workdir/tasks/padovan-n-step-number-sequences)
[INFO] [stderr]     Checking binary-digits v0.1.0 (/opt/rustwide/workdir/tasks/binary-digits)
[INFO] [stderr]     Checking solve-a-hidato-puzzle v0.1.0 (/opt/rustwide/workdir/tasks/solve-a-hidato-puzzle)
[INFO] [stderr]     Checking sleep-sort v0.1.0 (/opt/rustwide/workdir/tasks/sorting-algorithms/sleep-sort)
[INFO] [stderr]     Checking fibonacci-sequence v0.1.0 (/opt/rustwide/workdir/tasks/fibonacci-sequence)
[INFO] [stderr]     Checking ordered-words v0.1.0 (/opt/rustwide/workdir/tasks/ordered-words)
[INFO] [stderr]     Checking magic-squares-of-odd-order v0.1.0 (/opt/rustwide/workdir/tasks/magic-squares-of-odd-order)
[INFO] [stderr]     Checking function-composition v0.1.0 (/opt/rustwide/workdir/tasks/function-composition)
[INFO] [stderr]     Checking call-an-object-method v0.1.0 (/opt/rustwide/workdir/tasks/call-an-object-method)
[INFO] [stderr]     Checking find-limit-of-recursion v0.1.0 (/opt/rustwide/workdir/tasks/find-limit-of-recursion)
[INFO] [stderr]     Checking mean-time-of-day v0.1.0 (/opt/rustwide/workdir/tasks/averages/mean-time-of-day)
[INFO] [stderr]     Checking flatten-a-list v0.1.0 (/opt/rustwide/workdir/tasks/flatten-a-list)
[INFO] [stderr]     Checking chat-server v0.1.0 (/opt/rustwide/workdir/tasks/chat-server)
[INFO] [stderr]     Checking price-fraction v0.1.0 (/opt/rustwide/workdir/tasks/price-fraction)
[INFO] [stderr]     Checking definition v0.1.0 (/opt/rustwide/workdir/tasks/queue/definition)
[INFO] [stderr]     Checking array-concatenation v0.1.0 (/opt/rustwide/workdir/tasks/array-concatenation)
[INFO] [stderr]     Checking move-to-front v0.1.0 (/opt/rustwide/workdir/tasks/move-to-front)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tasks/flatten-a-list/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking encode v0.1.0 (/opt/rustwide/workdir/tasks/roman-numerals/encode)
[INFO] [stderr]     Checking taxicab-numbers v0.1.0 (/opt/rustwide/workdir/tasks/taxicab-numbers)
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flatten-a-list` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> tasks/flatten-a-list/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_syntax)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "85987247ab5dcaf37967cfcbf4961051a53dce203e4f5c9e21b2f5549c4ba83f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85987247ab5dcaf37967cfcbf4961051a53dce203e4f5c9e21b2f5549c4ba83f", kill_on_drop: false }`
[INFO] [stdout] 85987247ab5dcaf37967cfcbf4961051a53dce203e4f5c9e21b2f5549c4ba83f
