[INFO] fetching crate arkecosystem-crypto 0.1.0...
[INFO] checking arkecosystem-crypto-0.1.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate arkecosystem-crypto 0.1.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate arkecosystem-crypto 0.1.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arkecosystem-crypto 0.1.0
[INFO] finished tweaking crates.io crate arkecosystem-crypto 0.1.0
[INFO] tweaked toml for crates.io crate arkecosystem-crypto 0.1.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 79 packages
[INFO] [stderr]       Adding addr2line v0.14.1 (latest: v0.21.0)
[INFO] [stderr]       Adding backtrace v0.3.57 (latest: v0.3.71)
[INFO] [stderr]       Adding bech32 v0.5.0 (latest: v0.11.0)
[INFO] [stderr]       Adding bitcoin v0.14.2 (latest: v0.31.2)
[INFO] [stderr]       Adding bitcoin-bech32 v0.8.1 (latest: v0.13.0)
[INFO] [stderr]       Adding block-buffer v0.3.3 (latest: v0.10.4)
[INFO] [stderr]       Adding byte-tools v0.2.0 (latest: v0.3.1)
[INFO] [stderr]       Adding cc v1.0.26 (latest: v1.0.90)
[INFO] [stderr]       Adding digest v0.7.6 (latest: v0.10.7)
[INFO] [stderr]       Adding generic-array v0.9.1 (latest: v1.0.0)
[INFO] [stderr]       Adding gimli v0.23.0 (latest: v0.28.1)
[INFO] [stderr]       Adding hex v0.3.2 (latest: v0.4.3)
[INFO] [stderr]       Adding iana-time-zone v0.1.50 (latest: v0.1.60)
[INFO] [stderr]       Adding miniz_oxide v0.4.4 (latest: v0.7.2)
[INFO] [stderr]       Adding object v0.23.0 (latest: v0.34.0)
[INFO] [stderr]       Adding rand v0.3.23 (latest: v0.8.5)
[INFO] [stderr]       Adding rand v0.4.6 (latest: v0.8.5)
[INFO] [stderr]       Adding rand_core v0.3.1 (latest: v0.6.4)
[INFO] [stderr]       Adding rand_core v0.4.2 (latest: v0.6.4)
[INFO] [stderr]       Adding rdrand v0.4.0 (latest: v0.8.3)
[INFO] [stderr]       Adding ripemd160 v0.7.0 (latest: v0.10.0)
[INFO] [stderr]       Adding secp256k1 v0.11.6 (latest: v0.29.0)
[INFO] [stderr]       Adding sha2 v0.7.1 (latest: v0.10.8)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding synstructure v0.12.6 (latest: v0.13.1)
[INFO] [stderr]       Adding time v0.1.45 (latest: v0.3.34)
[INFO] [stderr]       Adding wasi v0.10.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded block-buffer v0.3.3
[INFO] [stderr]   Downloaded fake-simd v0.1.2
[INFO] [stderr]   Downloaded sha2 v0.7.1
[INFO] [stderr]   Downloaded cc v1.0.26
[INFO] [stderr]   Downloaded digest v0.7.6
[INFO] [stderr]   Downloaded byte-tools v0.2.0
[INFO] [stderr]   Downloaded generic-array v0.9.1
[INFO] [stderr]   Downloaded failure_derive v0.1.8
[INFO] [stderr]   Downloaded synstructure v0.12.6
[INFO] [stderr]   Downloaded iana-time-zone v0.1.50
[INFO] [stderr]   Downloaded unicode-xid v0.2.4
[INFO] [stderr]   Downloaded bech32 v0.5.0
[INFO] [stderr]   Downloaded backtrace v0.3.57
[INFO] [stderr]   Downloaded gcc v0.3.55
[INFO] [stderr]   Downloaded bitcoin v0.14.2
[INFO] [stderr]   Downloaded object v0.23.0
[INFO] [stderr]   Downloaded rustc-serialize v0.3.25
[INFO] [stderr]   Downloaded rust-crypto v0.2.36
[INFO] [stderr]   Downloaded gimli v0.23.0
[INFO] [stderr]   Downloaded wasi v0.10.0+wasi-snapshot-preview1
[INFO] [stderr]   Downloaded time v0.1.45
[INFO] [stderr]   Downloaded addr2line v0.14.1
[INFO] [stderr]   Downloaded miniz_oxide v0.4.4
[INFO] [stderr]   Downloaded failure v0.1.8
[INFO] [stderr]   Downloaded ripemd160 v0.7.0
[INFO] [stderr]   Downloaded secp256k1 v0.11.6
[INFO] [stderr]   Downloaded hex v0.3.2
[INFO] [stderr]   Downloaded bitcoin-bech32 v0.8.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 090ccbd4972b511c03fb79c441b5926c6f9f16dc4ff959ff629d167e8d7d416b
[INFO] running `Command { std: "docker" "start" "-a" "090ccbd4972b511c03fb79c441b5926c6f9f16dc4ff959ff629d167e8d7d416b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "090ccbd4972b511c03fb79c441b5926c6f9f16dc4ff959ff629d167e8d7d416b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "090ccbd4972b511c03fb79c441b5926c6f9f16dc4ff959ff629d167e8d7d416b", kill_on_drop: false }`
[INFO] [stdout] 090ccbd4972b511c03fb79c441b5926c6f9f16dc4ff959ff629d167e8d7d416b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77e209de3cbebfa7e45faaaed059d65c5821a1af85388a53587e0e96f1b3cb59
[INFO] running `Command { std: "docker" "start" "-a" "77e209de3cbebfa7e45faaaed059d65c5821a1af85388a53587e0e96f1b3cb59", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling autocfg v1.2.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.79
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling cc v1.0.26
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling serde v1.0.197
[INFO] [stderr]     Checking gimli v0.23.0
[INFO] [stderr]     Checking arrayref v0.3.7
[INFO] [stderr]     Checking byte-tools v0.2.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]     Checking bech32 v0.5.0
[INFO] [stderr]    Compiling serde_json v1.0.115
[INFO] [stderr]     Checking rustc-serialize v0.3.25
[INFO] [stderr]     Checking object v0.23.0
[INFO] [stderr]     Checking block-buffer v0.3.3
[INFO] [stderr]     Checking rustc-demangle v0.1.23
[INFO] [stderr]     Checking bitcoin-bech32 v0.8.1
[INFO] [stderr]     Checking ryu v1.0.17
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-traits v0.2.18
[INFO] [stderr]     Checking iana-time-zone v0.1.50
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking itoa v1.0.11
[INFO] [stderr]    Compiling secp256k1 v0.11.6
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling quote v1.0.35
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking time v0.1.45
[INFO] [stderr]    Compiling syn v2.0.58
[INFO] [stderr]     Checking generic-array v0.9.1
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking chrono v0.4.37
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking sha2 v0.7.1
[INFO] [stderr]     Checking ripemd160 v0.7.0
[INFO] [stderr]     Checking addr2line v0.14.1
[INFO] [stderr]     Checking backtrace v0.3.57
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking bitcoin v0.14.2
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking arkecosystem-crypto v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/utils/message.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `secp256k1` is imported redundantly
[INFO] [stdout]  --> src/utils/message.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use secp256k1;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate secp256k1;
[INFO] [stdout]   | ----------------------- the item `secp256k1` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/utils/message.rs:4:5
[INFO] [stdout]    |
[INFO] [stdout] 4  | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `failure` is imported redundantly
[INFO] [stdout]  --> src/utils/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use failure;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate failure;
[INFO] [stdout]   | --------------------- the item `failure` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/utils/mod.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]  --> src/configuration/network.rs:5:42
[INFO] [stdout]   |
[INFO] [stdout] 5 |     static ref NETWORK: Mutex<Network> = { Mutex::new(Network::Mainnet) };
[INFO] [stdout]   |                                          ^^                            ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]   |
[INFO] [stdout] 5 -     static ref NETWORK: Mutex<Network> = { Mutex::new(Network::Mainnet) };
[INFO] [stdout] 5 +     static ref NETWORK: Mutex<Network> = Mutex::new(Network::Mainnet);
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/address.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/private_key.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/public_key.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `failure` is imported redundantly
[INFO] [stdout]  --> src/transactions/builder.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use failure;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate failure;
[INFO] [stdout]   | --------------------- the item `failure` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/builder.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/deserializer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/serializer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/transaction.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `secp256k1` is imported redundantly
[INFO] [stdout]  --> src/transactions/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use secp256k1;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate secp256k1;
[INFO] [stdout]   | ----------------------- the item `secp256k1` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/transactions/transaction.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/utils/message.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `secp256k1` is imported redundantly
[INFO] [stdout]  --> src/utils/message.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use secp256k1;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate secp256k1;
[INFO] [stdout]   | ----------------------- the item `secp256k1` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/utils/message.rs:4:5
[INFO] [stdout]    |
[INFO] [stdout] 4  | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `failure` is imported redundantly
[INFO] [stdout]  --> src/utils/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use failure;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate failure;
[INFO] [stdout]   | --------------------- the item `failure` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/utils/mod.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary braces around block return value
[INFO] [stdout]  --> src/configuration/network.rs:5:42
[INFO] [stdout]   |
[INFO] [stdout] 5 |     static ref NETWORK: Mutex<Network> = { Mutex::new(Network::Mainnet) };
[INFO] [stdout]   |                                          ^^                            ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_braces)]` on by default
[INFO] [stdout] help: remove these braces
[INFO] [stdout]   |
[INFO] [stdout] 5 -     static ref NETWORK: Mutex<Network> = { Mutex::new(Network::Mainnet) };
[INFO] [stdout] 5 +     static ref NETWORK: Mutex<Network> = Mutex::new(Network::Mainnet);
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/address.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/private_key.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/identities/public_key.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `failure` is imported redundantly
[INFO] [stdout]  --> src/transactions/builder.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use failure;
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | extern crate failure;
[INFO] [stdout]   | --------------------- the item `failure` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/builder.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/deserializer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/serializer.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `hex` is imported redundantly
[INFO] [stdout]  --> src/transactions/transaction.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use hex;
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | extern crate hex;
[INFO] [stdout]   | ----------------- the item `hex` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `secp256k1` is imported redundantly
[INFO] [stdout]  --> src/transactions/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use secp256k1;
[INFO] [stdout]   |     ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]  ::: src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | extern crate secp256k1;
[INFO] [stdout]   | ----------------------- the item `secp256k1` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `serde_json` is imported redundantly
[INFO] [stdout]   --> src/transactions/transaction.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | use serde_json;
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/lib.rs:13:1
[INFO] [stdout]    |
[INFO] [stdout] 13 | extern crate serde_json;
[INFO] [stdout]    | ------------------------ the item `serde_json` is already imported here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/transactions/deserializer.rs:292:21
[INFO] [stdout]     |
[INFO] [stdout] 292 |                 let mut keysgroup = keysgroup.as_mut_slice();
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/transactions/deserializer.rs:292:21
[INFO] [stdout]     |
[INFO] [stdout] 292 |                 let mut keysgroup = keysgroup.as_mut_slice();
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 17 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.46s
[INFO] running `Command { std: "docker" "inspect" "77e209de3cbebfa7e45faaaed059d65c5821a1af85388a53587e0e96f1b3cb59", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77e209de3cbebfa7e45faaaed059d65c5821a1af85388a53587e0e96f1b3cb59", kill_on_drop: false }`
[INFO] [stdout] 77e209de3cbebfa7e45faaaed059d65c5821a1af85388a53587e0e96f1b3cb59