[INFO] fetching crate vfork 0.1.0...
[INFO] checking vfork-0.1.0 against a5689b034ad287112f709693384a37f1377eb9cc for pr-129249-3
[INFO] extracting crate vfork 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate vfork 0.1.0
[INFO] finished tweaking crates.io crate vfork 0.1.0
[INFO] tweaked toml for crates.io crate vfork 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate vfork 0.1.0 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 crates.io crate vfork 0.1.0 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] b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc
[INFO] running `Command { std: "docker" "start" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc", 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" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc", 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" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc" "/opt/rustwide/cargo-home/bin/cargo" "+a5689b034ad287112f709693384a37f1377eb9cc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.148
[INFO] [stderr]     Checking vfork v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:33:28
[INFO] [stdout]    |
[INFO] [stdout] 33 |                 return Err(IoError::last_os_error().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] 33 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 33 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 33 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 33 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:54:28
[INFO] [stdout]    |
[INFO] [stdout] 54 |                 return Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 54 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 54 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 54 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 54 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 63 -             Err(IoError::last_os_error().into())
[INFO] [stdout] 63 +             Err(IoError::last_os_error())
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 63 -             Err(IoError::last_os_error().into())
[INFO] [stdout] 63 +             Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/command.rs:56:28
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 return Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 56 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 56 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 56 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 56 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/command.rs:62:27
[INFO] [stdout]    |
[INFO] [stdout] 62 |                 -1 => Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 62 -                 -1 => Err(IoError::last_os_error().into()),
[INFO] [stdout] 62 +                 -1 => Err(IoError::last_os_error()),
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 62 -                 -1 => Err(IoError::last_os_error().into()),
[INFO] [stdout] 62 +                 -1 => Err(<std::io::Error as Into<_>>::into(IoError::last_os_error())),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:33:28
[INFO] [stdout]    |
[INFO] [stdout] 33 |                 return Err(IoError::last_os_error().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] 33 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 33 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 33 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 33 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vfork` (lib) due to 5 previous errors
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:54:28
[INFO] [stdout]    |
[INFO] [stdout] 54 |                 return Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 54 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 54 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 54 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 54 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/child.rs:63:17
[INFO] [stdout]    |
[INFO] [stdout] 63 |             Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 63 -             Err(IoError::last_os_error().into())
[INFO] [stdout] 63 +             Err(IoError::last_os_error())
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 63 -             Err(IoError::last_os_error().into())
[INFO] [stdout] 63 +             Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/command.rs:56:28
[INFO] [stdout]    |
[INFO] [stdout] 56 |                 return Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 56 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 56 +                 return Err(IoError::last_os_error());
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 56 -                 return Err(IoError::last_os_error().into());
[INFO] [stdout] 56 +                 return Err(<std::io::Error as Into<_>>::into(IoError::last_os_error()));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: useless conversion to the same type: `std::io::Error`
[INFO] [stdout]   --> src/command.rs:62:27
[INFO] [stdout]    |
[INFO] [stdout] 62 |                 -1 => Err(IoError::last_os_error().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] help: consider removing the conversion call
[INFO] [stdout]    |
[INFO] [stdout] 62 -                 -1 => Err(IoError::last_os_error().into()),
[INFO] [stdout] 62 +                 -1 => Err(IoError::last_os_error()),
[INFO] [stdout]    |
[INFO] [stdout] help: you can use the fully-qualified path to avoid triggering this lint
[INFO] [stdout]    |
[INFO] [stdout] 62 -                 -1 => Err(IoError::last_os_error().into()),
[INFO] [stdout] 62 +                 -1 => Err(<std::io::Error as Into<_>>::into(IoError::last_os_error())),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `vfork` (lib test) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc", kill_on_drop: false }`
[INFO] [stdout] b86cc0314adc03a3cd0b10f98cc3efe0b6348420795154bab814c849fb56dccc
