[INFO] cloning repository https://github.com/ruby-on-rust/ruby-on-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ruby-on-rust/ruby-on-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruby-on-rust%2Fruby-on-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruby-on-rust%2Fruby-on-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 404687f73c7f5046c5999d0ef86487fb0071b71f
[INFO] documenting ruby-on-rust/ruby-on-rust against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fruby-on-rust%2Fruby-on-rust" "/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/ruby-on-rust/ruby-on-rust on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ruby-on-rust/ruby-on-rust
[INFO] finished tweaking git repo https://github.com/ruby-on-rust/ruby-on-rust
[INFO] tweaked toml for git repo https://github.com/ruby-on-rust/ruby-on-rust written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/ruby-on-rust/ruby-on-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded strum v0.10.0
[INFO] [stderr]   Downloaded strum_macros v0.10.0
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f87dae8825c78f196e638459a696b143e5fc7fe1eadcb9ca16fc12e978fddbc
[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" "9f87dae8825c78f196e638459a696b143e5fc7fe1eadcb9ca16fc12e978fddbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f87dae8825c78f196e638459a696b143e5fc7fe1eadcb9ca16fc12e978fddbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f87dae8825c78f196e638459a696b143e5fc7fe1eadcb9ca16fc12e978fddbc", kill_on_drop: false }`
[INFO] [stdout] 9f87dae8825c78f196e638459a696b143e5fc7fe1eadcb9ca16fc12e978fddbc
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f5227452e2df1135bc10852ae4f25b1d57c549cf36a28f00aa7d8b8456d3d6bb
[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" "f5227452e2df1135bc10852ae4f25b1d57c549cf36a28f00aa7d8b8456d3d6bb", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.17
[INFO] [stderr]    Compiling regex v1.0.4
[INFO] [stderr]     Checking utf8-ranges v1.0.1
[INFO] [stderr]     Checking maplit v1.0.1
[INFO] [stderr]     Checking strum v0.10.0
[INFO] [stderr]     Checking regex-syntax v0.6.2
[INFO] [stderr]     Checking memchr v2.0.2
[INFO] [stderr]     Checking uuid v0.7.1
[INFO] [stderr]     Checking lazy_static v1.1.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.6.8
[INFO] [stderr]    Compiling quote v0.6.8
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling strum_macros v0.10.0
[INFO] [stderr]  Documenting ruby_on_rust v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around assigned value
[INFO] [stdout]    --> src/lexer/literal.rs:151:26
[INFO] [stdout]     |
[INFO] [stdout] 151 |         let monolithic = ( start_tok.clone() == Token::T_STRING_BEG && ( &str_type == "'" || &str_type == "\"" ) );
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/lexer/literal.rs:287:28
[INFO] [stdout]     |
[INFO] [stdout] 287 |         let lookahead = if (lookahead.is_some() && !lookahead.clone().unwrap().is_empty()) { lookahead } else { None };
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:705:14
[INFO] [stdout]     |
[INFO] [stdout] 705 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:709:14
[INFO] [stdout]     |
[INFO] [stdout] 709 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:713:14
[INFO] [stdout]     |
[INFO] [stdout] 713 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:717:14
[INFO] [stdout]     |
[INFO] [stdout] 717 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:721:14
[INFO] [stdout]     |
[INFO] [stdout] 721 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:725:14
[INFO] [stdout]     |
[INFO] [stdout] 725 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:729:14
[INFO] [stdout]     |
[INFO] [stdout] 729 |                                                     {tm = p - 3 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:733:14
[INFO] [stdout]     |
[INFO] [stdout] 733 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:737:14
[INFO] [stdout]     |
[INFO] [stdout] 737 |                                                     {tm = p - 2 }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:758:14
[INFO] [stdout]     |
[INFO] [stdout] 758 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:762:14
[INFO] [stdout]     |
[INFO] [stdout] 762 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:766:14
[INFO] [stdout]     |
[INFO] [stdout] 766 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:806:14
[INFO] [stdout]     |
[INFO] [stdout] 806 |                                                     {self.num_suffix_s = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]    --> src/lexer/lexer.rs:810:14
[INFO] [stdout]     |
[INFO] [stdout] 810 |                                                     {tm = p }
[INFO] [stdout]     |                                                     ^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]     --> src/lexer/lexer.rs:5561:16
[INFO] [stdout]      |
[INFO] [stdout] 5561 |                                                             {p = pe - 3 }
[INFO] [stdout]      |                                                             ^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]     --> src/parser/parser.rs:7051:13
[INFO] [stdout]      |
[INFO] [stdout] 7051 | let __ = if ( _2.is_empty() && _1.len() == 1 ) {
[INFO] [stdout]      |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 18 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 22.56s
[INFO] running `Command { std: "docker" "inspect" "f5227452e2df1135bc10852ae4f25b1d57c549cf36a28f00aa7d8b8456d3d6bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5227452e2df1135bc10852ae4f25b1d57c549cf36a28f00aa7d8b8456d3d6bb", kill_on_drop: false }`
[INFO] [stdout] f5227452e2df1135bc10852ae4f25b1d57c549cf36a28f00aa7d8b8456d3d6bb