[INFO] cloning repository https://github.com/persona-mp3/mapreduce
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/persona-mp3/mapreduce" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpersona-mp3%2Fmapreduce", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpersona-mp3%2Fmapreduce'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7f32cbdbf4f50b77e0179276fc26c8203c3af2ef
[INFO] checking persona-mp3/mapreduce against a5689b034ad287112f709693384a37f1377eb9cc for pr-129249-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpersona-mp3%2Fmapreduce" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/persona-mp3/mapreduce
[INFO] finished tweaking git repo https://github.com/persona-mp3/mapreduce
[INFO] tweaked toml for git repo https://github.com/persona-mp3/mapreduce written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/persona-mp3/mapreduce on toolchain a5689b034ad287112f709693384a37f1377eb9cc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/persona-mp3/mapreduce already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0
[INFO] running `Command { std: "docker" "start" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking mapreduce v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: useless conversion to the same type: `Box<dyn std::error::Error>`
[INFO] [stdout]    --> src/worker.rs:117:24
[INFO] [stdout]     |
[INFO] [stdout] 117 |             return Err(err.into());
[INFO] [stdout]     |                        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this method call relies on the `impl<T> Into<T> for T` blanket implementation and type inference, which is a semver hazard as a new `impl Into<_>` that affects your type might be added in the future causing type inference errors
[INFO] [stdout]     = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] help: consider removing the conversion call
[INFO] [stdout]     |
[INFO] [stdout] 117 -             return Err(err.into());
[INFO] [stdout] 117 +             return Err(err);
[INFO] [stdout]     |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]     |
[INFO] [stdout] 117 -             return Err(err.into());
[INFO] [stdout] 117 +             return Err(<Box<dyn std::error::Error> as Into<_>>::into(err));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mapreduce` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: useless conversion to the same type: `Box<dyn std::error::Error>`
[INFO] [stdout]    --> src/worker.rs:117:24
[INFO] [stdout]     |
[INFO] [stdout] 117 |             return Err(err.into());
[INFO] [stdout]     |                        ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this method call relies on the `impl<T> Into<T> for T` blanket implementation and type inference, which is a semver hazard as a new `impl Into<_>` that affects your type might be added in the future causing type inference errors
[INFO] [stdout]     = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] help: consider removing the conversion call
[INFO] [stdout]     |
[INFO] [stdout] 117 -             return Err(err.into());
[INFO] [stdout] 117 +             return Err(err);
[INFO] [stdout]     |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]     |
[INFO] [stdout] 117 -             return Err(err.into());
[INFO] [stdout] 117 +             return Err(<Box<dyn std::error::Error> as Into<_>>::into(err));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mapreduce` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0", kill_on_drop: false }`
[INFO] [stdout] 266e372e318aa7677da625ff1b03ae4f20bf58abd0554216362a90c068dda9d0
