[INFO] fetching crate currency 0.4.0...
[INFO] checking currency-0.4.0 against beta for pr-78714
[INFO] extracting crate currency 0.4.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate currency 0.4.0 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 currency 0.4.0
[INFO] finished tweaking crates.io crate currency 0.4.0
[INFO] tweaked toml for crates.io crate currency 0.4.0 written to /workspace/builds/worker-1/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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0796e00a34761fca01663151acc2c31491d924def90e4b508f1f1cb599b1ad06
[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" "0796e00a34761fca01663151acc2c31491d924def90e4b508f1f1cb599b1ad06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0796e00a34761fca01663151acc2c31491d924def90e4b508f1f1cb599b1ad06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0796e00a34761fca01663151acc2c31491d924def90e4b508f1f1cb599b1ad06", kill_on_drop: false }`
[INFO] [stdout] 0796e00a34761fca01663151acc2c31491d924def90e4b508f1f1cb599b1ad06
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0efa7cf1c1965baa5bed2b914d1c21c91d13654451e8484c5d0073c9e385f2f6
[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" "0efa7cf1c1965baa5bed2b914d1c21c91d13654451e8484c5d0073c9e385f2f6", kill_on_drop: false }`
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking currency v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `BigUint` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:85:27
[INFO] [stdout]    |
[INFO] [stdout] 46 | use num::bigint::{BigInt, BigUint, Sign};
[INFO] [stdout]    |                           ------- the item `BigUint` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 85 |         use num::bigint::{BigUint, Sign};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Sign` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:85:36
[INFO] [stdout]    |
[INFO] [stdout] 46 | use num::bigint::{BigInt, BigUint, Sign};
[INFO] [stdout]    |                                    ---- the item `Sign` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 85 |         use num::bigint::{BigUint, Sign};
[INFO] [stdout]    |                                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `BigUint` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:85:27
[INFO] [stdout]    |
[INFO] [stdout] 46 | use num::bigint::{BigInt, BigUint, Sign};
[INFO] [stdout]    |                           ------- the item `BigUint` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 85 |         use num::bigint::{BigUint, Sign};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Sign` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:85:36
[INFO] [stdout]    |
[INFO] [stdout] 46 | use num::bigint::{BigInt, BigUint, Sign};
[INFO] [stdout]    |                                    ---- the item `Sign` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 85 |         use num::bigint::{BigUint, Sign};
[INFO] [stdout]    |                                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str::FromStr`
[INFO] [stdout]    --> src/lib.rs:752:13
[INFO] [stdout]     |
[INFO] [stdout] 752 |         use std::str::FromStr;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.49s
[INFO] running `Command { std: "docker" "inspect" "0efa7cf1c1965baa5bed2b914d1c21c91d13654451e8484c5d0073c9e385f2f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0efa7cf1c1965baa5bed2b914d1c21c91d13654451e8484c5d0073c9e385f2f6", kill_on_drop: false }`
[INFO] [stdout] 0efa7cf1c1965baa5bed2b914d1c21c91d13654451e8484c5d0073c9e385f2f6