[INFO] cloning repository https://github.com/nrxus/advent_2018
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nrxus/advent_2018" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_2018", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_2018'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0f7b9bc6e61ad765717d77e17cb205c55563b07c
[INFO] documenting nrxus/advent_2018 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_2018" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nrxus/advent_2018 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nrxus/advent_2018
[INFO] finished tweaking git repo https://github.com/nrxus/advent_2018
[INFO] tweaked toml for git repo https://github.com/nrxus/advent_2018 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/nrxus/advent_2018 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 19b6321f2d5b30a25ea62928c65097eb9e838edd97ac1eb69e9d20770bc2d368
[INFO] running `Command { std: "docker" "start" "-a" "19b6321f2d5b30a25ea62928c65097eb9e838edd97ac1eb69e9d20770bc2d368", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "19b6321f2d5b30a25ea62928c65097eb9e838edd97ac1eb69e9d20770bc2d368", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19b6321f2d5b30a25ea62928c65097eb9e838edd97ac1eb69e9d20770bc2d368", kill_on_drop: false }`
[INFO] [stdout] 19b6321f2d5b30a25ea62928c65097eb9e838edd97ac1eb69e9d20770bc2d368
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "RUSTDOCFLAGS=--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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 514af5fbd075b680461cf253bc2061355036bc025c1674d2d529f9fe52d49540
[INFO] running `Command { std: "docker" "start" "-a" "514af5fbd075b680461cf253bc2061355036bc025c1674d2d529f9fe52d49540", kill_on_drop: false }`
[INFO] [stderr]     Checking slab v0.4.1
[INFO] [stderr]     Checking lazycell v1.2.0
[INFO] [stderr]    Compiling rand_core v0.3.0
[INFO] [stderr]    Compiling openssl v0.10.15
[INFO] [stderr]    Compiling serde v1.0.80
[INFO] [stderr]    Compiling crc32fast v1.1.1
[INFO] [stderr]     Checking string v0.1.2
[INFO] [stderr]    Compiling native-tls v0.2.2
[INFO] [stderr]    Compiling encoding_rs v0.8.13
[INFO] [stderr]     Checking strum v0.13.0
[INFO] [stderr]     Checking crossbeam-utils v0.6.1
[INFO] [stderr]     Checking tokio-executor v0.1.5
[INFO] [stderr]     Checking arrayvec v0.4.8
[INFO] [stderr]    Compiling openssl-sys v0.9.39
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking net2 v0.2.33
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[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]    Compiling phf_shared v0.7.23
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[INFO] [stderr]     Checking rand_chacha v0.1.0
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[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]     Checking rand v0.6.1
[INFO] [stderr]     Checking bytes v0.4.11
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[INFO] [stderr]    Compiling rand_core v0.2.2
[INFO] [stderr]     Checking crossbeam-epoch v0.6.1
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[INFO] [stderr]     Checking parking_lot v0.6.4
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[INFO] [stderr]    Compiling phf_generator v0.7.23
[INFO] [stderr]     Checking tokio-reactor v0.1.7
[INFO] [stderr]     Checking rayon v1.0.3
[INFO] [stderr]    Compiling phf_codegen v0.7.23
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[INFO] [stderr]     Checking tokio-uds v0.2.4
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]    Compiling mime_guess v2.0.0-alpha.6
[INFO] [stderr]     Checking tokio-fs v0.1.4
[INFO] [stderr]     Checking tokio v0.1.13
[INFO] [stderr]     Checking h2 v0.1.13
[INFO] [stderr]    Compiling enum-map-derive v0.4.0
[INFO] [stderr]    Compiling strum_macros v0.13.0
[INFO] [stderr]     Checking enum-map v0.4.1
[INFO] [stderr]     Checking serde_json v1.0.33
[INFO] [stderr]     Checking serde_urlencoded v0.5.4
[INFO] [stderr]     Checking hyper v0.12.16
[INFO] [stderr]     Checking hyper-tls v0.3.1
[INFO] [stderr]     Checking reqwest v0.9.5
[INFO] [stderr]     Checking advent_2018 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting advent_2018 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/twenty_one_b.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, option::NoneError, str::FromStr};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/twenty_one_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `advent_2018`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name twenty_one_b src/twenty_one_b.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern common=/opt/rustwide/target/debug/deps/libcommon-ae52f7e9c894c560.rmeta --extern array_macro=/opt/rustwide/target/debug/deps/libarray_macro-91429d73892f93e7.rmeta --extern cookie=/opt/rustwide/target/debug/deps/libcookie-9819ceee3fa64d07.rmeta --extern enum_map=/opt/rustwide/target/debug/deps/libenum_map-4eb2e13aff4f6fb5.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-9b8e9bf0b3a6063b.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-5a01154d4c459a35.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-70dfc428c7644d28.rmeta --extern reqwest=/opt/rustwide/target/debug/deps/libreqwest-3f0c2889ccc8cfdd.rmeta --extern strum=/opt/rustwide/target/debug/deps/libstrum-fac237e50f67e9df.rmeta --extern strum_macros=/opt/rustwide/target/debug/deps/libstrum_macros-6788104278611ab9.so --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/seventeen_a.rs:3:52
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, ops::RangeInclusive, option::NoneError, str::FromStr};
[INFO] [stdout]   |                                                    ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/seventeen_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/seven_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/sixteen_a.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, option::NoneError};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/sixteen_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/fifteen_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/fifteen_b.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(bind_by_move_pattern_guards)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `bind_by_move_pattern_guards` has been stable since 1.39.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/nineteen_a.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, option::NoneError, str::FromStr};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/nineteen_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]   --> src/twenty_two_b.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     option::NoneError,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/twenty_two_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/twenty_five.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/twenty_three_a.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, option::NoneError};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/twenty_three_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/three_a.rs:3:31
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{num::ParseIntError, option::NoneError, str::FromStr};
[INFO] [stdout]   |                               ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/three_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/eighteen_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(never_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/twenty_two_a.rs:7:36
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{fmt, num::ParseIntError, option::NoneError, str::FromStr};
[INFO] [stdout]   |                                    ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/three_b.rs:4:53
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::{collections::HashSet, num::ParseIntError, option::NoneError, str::FromStr};
[INFO] [stdout]   |                                                     ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/twenty_two_a.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/three_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/three_b.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(vec_remove_item)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::option::NoneError`
[INFO] [stdout]  --> src/sixteen_b.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     option::NoneError,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^ no `NoneError` in `option`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/sixteen_b.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(try_trait)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "514af5fbd075b680461cf253bc2061355036bc025c1674d2d529f9fe52d49540", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "514af5fbd075b680461cf253bc2061355036bc025c1674d2d529f9fe52d49540", kill_on_drop: false }`
[INFO] [stdout] 514af5fbd075b680461cf253bc2061355036bc025c1674d2d529f9fe52d49540
