[INFO] cloning repository https://github.com/lions-language/rust-toy-language
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lions-language/rust-toy-language" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flions-language%2Frust-toy-language", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flions-language%2Frust-toy-language'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0683e3737381820766ac0fbbf785e8da430cd1d2
[INFO] documenting lions-language/rust-toy-language against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flions-language%2Frust-toy-language" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lions-language/rust-toy-language on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lions-language/rust-toy-language
[INFO] finished tweaking git repo https://github.com/lions-language/rust-toy-language
[INFO] tweaked toml for git repo https://github.com/lions-language/rust-toy-language written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/lions-language/rust-toy-language already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded educe v0.4.18
[INFO] [stderr]   Downloaded enum-ordinalize v3.1.10
[INFO] [stderr]   Downloaded try_match_inner v0.4.0
[INFO] [stderr]   Downloaded try_match v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8da377c4f44d1df3013be516fec2ea20bc48ab3e9ce2e29d04beddf855edcb59
[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" "8da377c4f44d1df3013be516fec2ea20bc48ab3e9ce2e29d04beddf855edcb59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8da377c4f44d1df3013be516fec2ea20bc48ab3e9ce2e29d04beddf855edcb59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8da377c4f44d1df3013be516fec2ea20bc48ab3e9ce2e29d04beddf855edcb59", kill_on_drop: false }`
[INFO] [stdout] 8da377c4f44d1df3013be516fec2ea20bc48ab3e9ce2e29d04beddf855edcb59
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", 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] 40359d4010186d92bc2980ebd86fa0a0fdc054251a7482d2fd9eef82f9165b9f
[INFO] running `Command { std: "docker" "start" "-a" "40359d4010186d92bc2980ebd86fa0a0fdc054251a7482d2fd9eef82f9165b9f", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]     Checking lexical v0.1.0 (/opt/rustwide/workdir/src/lexical)
[INFO] [stderr]     Checking utils v0.1.0 (/opt/rustwide/workdir/src/utils)
[INFO] [stderr]  Documenting lexical v0.1.0 (/opt/rustwide/workdir/src/lexical)
[INFO] [stderr]  Documenting utils v0.1.0 (/opt/rustwide/workdir/src/utils)
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stdout] warning: unused import: `std::ops::Deref`
[INFO] [stdout]  --> src/utils/src/cell/mod.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Deref;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/lexical/src/parser/from_string.rs:86:29
[INFO] [stdout]    |
[INFO] [stdout] 86 |                 '0'..='9' | '.' => {
[INFO] [stdout]    |                             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lexical/src/parser/from_string.rs:104:33
[INFO] [stdout]     |
[INFO] [stdout] 104 | ...                   let mut suffix = self.peeking_take_while(chars, |ch| self.is_char(ch));
[INFO] [stdout]     |                           ----^^^^^^
[INFO] [stdout]     |                           |
[INFO] [stdout]     |                           help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lexical/src/parser/from_string.rs:114:25
[INFO] [stdout]     |
[INFO] [stdout] 114 |                     let mut s = self.peeking_take_while(chars, |ch| ch != '"');
[INFO] [stdout]     |                         ----^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling enum-ordinalize v3.1.10
[INFO] [stderr]    Compiling try_match_inner v0.4.0
[INFO] [stderr]    Compiling derive-new v0.5.9
[INFO] [stderr]     Checking try_match v0.3.0
[INFO] [stderr]    Compiling educe v0.4.18
[INFO] [stderr]  Documenting grammar v0.1.0 (/opt/rustwide/workdir/src/grammar)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/grammar/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_into_inner)]
[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: could not document `grammar`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name grammar src/grammar/src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f3ca18596e117085 -L dependency=/opt/rustwide/target/debug/deps --extern derive_new=/opt/rustwide/target/debug/deps/libderive_new-cd09931669a922be.so --extern educe=/opt/rustwide/target/debug/deps/libeduce-1b714d7ce17b06c1.so --extern lexical=/opt/rustwide/target/debug/deps/liblexical-8588be8c5fdb670e.rmeta --extern matches=/opt/rustwide/target/debug/deps/libmatches-f1c4024f57379e6f.rmeta --extern try_match=/opt/rustwide/target/debug/deps/libtry_match-ea20a16717a110a2.rmeta --extern utils=/opt/rustwide/target/debug/deps/libutils-0ef395eee04eb452.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "40359d4010186d92bc2980ebd86fa0a0fdc054251a7482d2fd9eef82f9165b9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "40359d4010186d92bc2980ebd86fa0a0fdc054251a7482d2fd9eef82f9165b9f", kill_on_drop: false }`
[INFO] [stdout] 40359d4010186d92bc2980ebd86fa0a0fdc054251a7482d2fd9eef82f9165b9f