[INFO] updating cached repository https://github.com/bruno-anjos/alpha
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 56c2034fd0e8ed294213cc2d6622a2fcd9d20d7a
[INFO] testing bruno-anjos/alpha against beta-2020-06-03 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruno-anjos%2Falpha" "/workspace/builds/worker-11/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bruno-anjos/alpha on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bruno-anjos/alpha
[INFO] finished tweaking git repo https://github.com/bruno-anjos/alpha
[INFO] tweaked toml for git repo https://github.com/bruno-anjos/alpha written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/bruno-anjos/alpha already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bb75ba0e0b4f6e6a27f122f3f1e7c3e41892354db5adb048a0fa40bc09ee40c0
[INFO] running `"docker" "start" "-a" "bb75ba0e0b4f6e6a27f122f3f1e7c3e41892354db5adb048a0fa40bc09ee40c0"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling strsim v0.9.2
[INFO] [stderr]    Compiling bit-vec v0.5.1
[INFO] [stderr]    Compiling lalrpop-util v0.17.1
[INFO] [stderr]    Compiling itertools v0.8.0
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling ena v0.13.0
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]    Compiling sha2 v0.8.0
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling bit-set v0.5.1
[INFO] [stderr]    Compiling ascii-canvas v2.0.0
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]    Compiling string_cache_codegen v0.4.2
[INFO] [stderr]    Compiling string_cache v0.7.3
[INFO] [stderr]    Compiling serde_derive v1.0.98
[INFO] [stderr]    Compiling serde v1.0.98
[INFO] [stderr]    Compiling docopt v1.1.0
[INFO] [stderr]    Compiling lalrpop v0.17.1
[INFO] [stderr]    Compiling alpha v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17668:5
[INFO] [stderr]       |
[INFO] [stderr] 17668 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr]       |
[INFO] [stderr]       = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17679:5
[INFO] [stderr]       |
[INFO] [stderr] 17679 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17690:5
[INFO] [stderr]       |
[INFO] [stderr] 17690 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17701:5
[INFO] [stderr]       |
[INFO] [stderr] 17701 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17712:5
[INFO] [stderr]       |
[INFO] [stderr] 17712 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17723:5
[INFO] [stderr]       |
[INFO] [stderr] 17723 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17734:5
[INFO] [stderr]       |
[INFO] [stderr] 17734 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17745:5
[INFO] [stderr]       |
[INFO] [stderr] 17745 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17756:5
[INFO] [stderr]       |
[INFO] [stderr] 17756 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17767:5
[INFO] [stderr]       |
[INFO] [stderr] 17767 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17778:5
[INFO] [stderr]       |
[INFO] [stderr] 17778 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17919:5
[INFO] [stderr]       |
[INFO] [stderr] 17919 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17943:5
[INFO] [stderr]       |
[INFO] [stderr] 17943 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 45s
[INFO] running `"docker" "inspect" "bb75ba0e0b4f6e6a27f122f3f1e7c3e41892354db5adb048a0fa40bc09ee40c0"`
[INFO] running `"docker" "rm" "-f" "bb75ba0e0b4f6e6a27f122f3f1e7c3e41892354db5adb048a0fa40bc09ee40c0"`
[INFO] [stdout] bb75ba0e0b4f6e6a27f122f3f1e7c3e41892354db5adb048a0fa40bc09ee40c0
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b951b411aaf71808a1c3f08225818d60ec90b4ad38fc48695c13456f9b155f7f
[INFO] running `"docker" "start" "-a" "b951b411aaf71808a1c3f08225818d60ec90b4ad38fc48695c13456f9b155f7f"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling alpha v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17668:5
[INFO] [stderr]       |
[INFO] [stderr] 17668 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr]       |
[INFO] [stderr]       = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17679:5
[INFO] [stderr]       |
[INFO] [stderr] 17679 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17690:5
[INFO] [stderr]       |
[INFO] [stderr] 17690 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17701:5
[INFO] [stderr]       |
[INFO] [stderr] 17701 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17712:5
[INFO] [stderr]       |
[INFO] [stderr] 17712 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17723:5
[INFO] [stderr]       |
[INFO] [stderr] 17723 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17734:5
[INFO] [stderr]       |
[INFO] [stderr] 17734 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17745:5
[INFO] [stderr]       |
[INFO] [stderr] 17745 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17756:5
[INFO] [stderr]       |
[INFO] [stderr] 17756 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17767:5
[INFO] [stderr]       |
[INFO] [stderr] 17767 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17778:5
[INFO] [stderr]       |
[INFO] [stderr] 17778 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17919:5
[INFO] [stderr]       |
[INFO] [stderr] 17919 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17943:5
[INFO] [stderr]       |
[INFO] [stderr] 17943 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.39s
[INFO] running `"docker" "inspect" "b951b411aaf71808a1c3f08225818d60ec90b4ad38fc48695c13456f9b155f7f"`
[INFO] running `"docker" "rm" "-f" "b951b411aaf71808a1c3f08225818d60ec90b4ad38fc48695c13456f9b155f7f"`
[INFO] [stdout] b951b411aaf71808a1c3f08225818d60ec90b4ad38fc48695c13456f9b155f7f
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8c92e20b417dd68c791f55d4ab758c2f8baa72836b1e434ebeac063dc578a97b
[INFO] running `"docker" "start" "-a" "8c92e20b417dd68c791f55d4ab758c2f8baa72836b1e434ebeac063dc578a97b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17668:5
[INFO] [stderr]       |
[INFO] [stderr] 17668 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr]       |
[INFO] [stderr]       = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17679:5
[INFO] [stderr]       |
[INFO] [stderr] 17679 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17690:5
[INFO] [stderr]       |
[INFO] [stderr] 17690 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17701:5
[INFO] [stderr]       |
[INFO] [stderr] 17701 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17712:5
[INFO] [stderr]       |
[INFO] [stderr] 17712 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17723:5
[INFO] [stderr]       |
[INFO] [stderr] 17723 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17734:5
[INFO] [stderr]       |
[INFO] [stderr] 17734 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17745:5
[INFO] [stderr]       |
[INFO] [stderr] 17745 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17756:5
[INFO] [stderr]       |
[INFO] [stderr] 17756 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17767:5
[INFO] [stderr]       |
[INFO] [stderr] 17767 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17778:5
[INFO] [stderr]       |
[INFO] [stderr] 17778 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17919:5
[INFO] [stderr]       |
[INFO] [stderr] 17919 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]      --> /opt/rustwide/target/debug/build/alpha-8a99b453e7f66c21/out/parser.rs:17943:5
[INFO] [stderr]       |
[INFO] [stderr] 17943 |     (__0)
[INFO] [stderr]       |     ^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.17s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/alpha-63607e737adc97d3
[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
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "8c92e20b417dd68c791f55d4ab758c2f8baa72836b1e434ebeac063dc578a97b"`
[INFO] running `"docker" "rm" "-f" "8c92e20b417dd68c791f55d4ab758c2f8baa72836b1e434ebeac063dc578a97b"`
[INFO] [stdout] 8c92e20b417dd68c791f55d4ab758c2f8baa72836b1e434ebeac063dc578a97b