[INFO] fetching crate fraction 0.6.3...
[INFO] checking fraction-0.6.3 against beta for pr-78714
[INFO] extracting crate fraction 0.6.3 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate fraction 0.6.3 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fraction 0.6.3
[INFO] finished tweaking crates.io crate fraction 0.6.3
[INFO] tweaked toml for crates.io crate fraction 0.6.3 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 03b544956a49dce7d565a0b44b3118c17c61826e36bc4a810ab033ba95e95035
[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" "03b544956a49dce7d565a0b44b3118c17c61826e36bc4a810ab033ba95e95035", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03b544956a49dce7d565a0b44b3118c17c61826e36bc4a810ab033ba95e95035", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03b544956a49dce7d565a0b44b3118c17c61826e36bc4a810ab033ba95e95035", kill_on_drop: false }`
[INFO] [stdout] 03b544956a49dce7d565a0b44b3118c17c61826e36bc4a810ab033ba95e95035
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "RUSTFLAGS=--cap-lints=forbid" "-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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a9d82c9c539530ccf387ee415eaef3d6b84a2e2dfdea9bedde5a16b8d04b8c2c
[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" "a9d82c9c539530ccf387ee415eaef3d6b84a2e2dfdea9bedde5a16b8d04b8c2c", kill_on_drop: false }`
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking fraction v0.6.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:76:33
[INFO] [stdout]    |
[INFO] [stdout] 76 |     static ref _0_BU: BigUint = { BigUint::zero() };
[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/generic.rs:77:33
[INFO] [stdout]    |
[INFO] [stdout] 77 |     static ref _1_BU: BigUint = { BigUint::one() };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:78:34
[INFO] [stdout]    |
[INFO] [stdout] 78 |     static ref _10_BU: BigUint = { BigUint::from(10u8) };
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:79:32
[INFO] [stdout]    |
[INFO] [stdout] 79 |     static ref _0_BI: BigInt = { BigInt::zero() };
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:80:32
[INFO] [stdout]    |
[INFO] [stdout] 80 |     static ref _1_BI: BigInt = { BigInt::one() };
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:81:33
[INFO] [stdout]    |
[INFO] [stdout] 81 |     static ref _10_BI: BigInt = { BigInt::from(10i8) };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:76:33
[INFO] [stdout]    |
[INFO] [stdout] 76 |     static ref _0_BU: BigUint = { BigUint::zero() };
[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/generic.rs:77:33
[INFO] [stdout]    |
[INFO] [stdout] 77 |     static ref _1_BU: BigUint = { BigUint::one() };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:78:34
[INFO] [stdout]    |
[INFO] [stdout] 78 |     static ref _10_BU: BigUint = { BigUint::from(10u8) };
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:79:32
[INFO] [stdout]    |
[INFO] [stdout] 79 |     static ref _0_BI: BigInt = { BigInt::zero() };
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:80:32
[INFO] [stdout]    |
[INFO] [stdout] 80 |     static ref _1_BI: BigInt = { BigInt::one() };
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]   --> src/generic.rs:81:33
[INFO] [stdout]    |
[INFO] [stdout] 81 |     static ref _10_BI: BigInt = { BigInt::from(10i8) };
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^ help: remove these braces
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.39s
[INFO] running `Command { std: "docker" "inspect" "a9d82c9c539530ccf387ee415eaef3d6b84a2e2dfdea9bedde5a16b8d04b8c2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9d82c9c539530ccf387ee415eaef3d6b84a2e2dfdea9bedde5a16b8d04b8c2c", kill_on_drop: false }`
[INFO] [stdout] a9d82c9c539530ccf387ee415eaef3d6b84a2e2dfdea9bedde5a16b8d04b8c2c