[INFO] cloning repository https://github.com/nikillxh/pow-blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nikillxh/pow-blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikillxh%2Fpow-blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikillxh%2Fpow-blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 187640e8c46abce295031f6028225ba3dc19b2f5
[INFO] checking nikillxh/pow-blockchain/187640e8c46abce295031f6028225ba3dc19b2f5 against master#8f21a5c92ea55c348c275a1bc4fedbdf181e0d64 for pr-143011
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnikillxh%2Fpow-blockchain" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nikillxh/pow-blockchain
[INFO] finished tweaking git repo https://github.com/nikillxh/pow-blockchain
[INFO] tweaked toml for git repo https://github.com/nikillxh/pow-blockchain written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nikillxh/pow-blockchain on toolchain 8f21a5c92ea55c348c275a1bc4fedbdf181e0d64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nikillxh/pow-blockchain 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" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libp2p-yamux v0.47.0
[INFO] [stderr]   Downloaded libp2p-noise v0.46.0
[INFO] [stderr]   Downloaded libp2p-gossipsub v0.48.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 189283dfbfb1b41890089c9f3b3f05a95e0402f3bc4fb2481b6ed5f7e54dcd5c
[INFO] running `Command { std: "docker" "start" "-a" "189283dfbfb1b41890089c9f3b3f05a95e0402f3bc4fb2481b6ed5f7e54dcd5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "189283dfbfb1b41890089c9f3b3f05a95e0402f3bc4fb2481b6ed5f7e54dcd5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "189283dfbfb1b41890089c9f3b3f05a95e0402f3bc4fb2481b6ed5f7e54dcd5c", kill_on_drop: false }`
[INFO] [stdout] 189283dfbfb1b41890089c9f3b3f05a95e0402f3bc4fb2481b6ed5f7e54dcd5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8f21a5c92ea55c348c275a1bc4fedbdf181e0d64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36bb1a9b112477ef53c6259155d2edfc1aea4e50dec146696a70aebc8c127d3e
[INFO] running `Command { std: "docker" "start" "-a" "36bb1a9b112477ef53c6259155d2edfc1aea4e50dec146696a70aebc8c127d3e", kill_on_drop: false }`
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[INFO] [stderr]     Checking pow_blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Keypair`
[INFO] [stdout]  --> src/wallet.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use secp256k1::{rand, Keypair, Message, PublicKey, Secp256k1, SecretKey};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sha256`
[INFO] [stdout]  --> src/wallet.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sha2::{Digest, Sha256};
[INFO] [stdout]   |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Keypair`
[INFO] [stdout]  --> src/wallet.rs:1:23
[INFO] [stdout]   |
[INFO] [stdout] 1 | use secp256k1::{rand, Keypair, Message, PublicKey, Secp256k1, SecretKey};
[INFO] [stdout]   |                       ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Sha256`
[INFO] [stdout]  --> src/wallet.rs:2:20
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sha2::{Digest, Sha256};
[INFO] [stdout]   |                    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Swarm` and `swarm::NetworkBehaviour`
[INFO] [stdout]  --> src/transaction.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 | use libp2p::{swarm::NetworkBehaviour, Swarm};
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Swarm` and `swarm::NetworkBehaviour`
[INFO] [stdout]  --> src/transaction.rs:2:14
[INFO] [stdout]   |
[INFO] [stdout] 2 | use libp2p::{swarm::NetworkBehaviour, Swarm};
[INFO] [stdout]   |              ^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::hash`
[INFO] [stdout]  --> src/blockchain.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::hash;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task`
[INFO] [stdout]   --> src/network.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::{io, select, sync::mpsc, task, time};
[INFO] [stdout]    |                                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `wallet::Wallet`
[INFO] [stdout]   --> src/network.rs:13:39
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::{communication::Broadcast, wallet::Wallet};
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/communication.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::wallet::{self, Wallet};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::hash`
[INFO] [stdout]  --> src/blockchain.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use core::hash;
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Hash`, `Hasher`, `collections::hash_map::DefaultHasher`, and `time::Duration`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     collections::hash_map::DefaultHasher, error::Error, hash::{Hash, Hasher}, sync::{Arc, Mutex}, time::Duration
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                       ^^^^  ^^^^^^                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `task`
[INFO] [stdout]   --> src/network.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 | use tokio::{io, select, sync::mpsc, task, time};
[INFO] [stdout]    |                                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `NetworkBehaviour`, `SwarmEvent`, `gossipsub`, `mdns`, `noise`, `tcp`, and `yamux`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     gossipsub, mdns, noise,
[INFO] [stdout]    |     ^^^^^^^^^  ^^^^  ^^^^^
[INFO] [stdout] 16 |     swarm::{NetworkBehaviour, SwarmEvent},
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 17 |     tcp, yamux,
[INFO] [stdout]    |     ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `io`, `select`, and `time`
[INFO] [stdout]   --> src/main.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 | use tokio::{io, select, sync::mpsc, task, time};
[INFO] [stdout]    |             ^^  ^^^^^^                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `wallet::Wallet`
[INFO] [stdout]   --> src/network.rs:13:39
[INFO] [stdout]    |
[INFO] [stdout] 13 | use crate::{communication::Broadcast, wallet::Wallet};
[INFO] [stdout]    |                                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tracing_subscriber::EnvFilter`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use tracing_subscriber::EnvFilter;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/communication.rs:1:21
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::wallet::{self, Wallet};
[INFO] [stdout]   |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Hash`, `Hasher`, `collections::hash_map::DefaultHasher`, and `time::Duration`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     collections::hash_map::DefaultHasher, error::Error, hash::{Hash, Hasher}, sync::{Arc, Mutex}, time::Duration
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                       ^^^^  ^^^^^^                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `NetworkBehaviour`, `SwarmEvent`, `gossipsub`, `mdns`, `noise`, `tcp`, and `yamux`
[INFO] [stdout]   --> src/main.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     gossipsub, mdns, noise,
[INFO] [stdout]    |     ^^^^^^^^^  ^^^^  ^^^^^
[INFO] [stdout] 16 |     swarm::{NetworkBehaviour, SwarmEvent},
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 17 |     tcp, yamux,
[INFO] [stdout]    |     ^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `io`, `select`, and `time`
[INFO] [stdout]   --> src/main.rs:20:13
[INFO] [stdout]    |
[INFO] [stdout] 20 | use tokio::{io, select, sync::mpsc, task, time};
[INFO] [stdout]    |             ^^  ^^^^^^                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `tracing_subscriber::EnvFilter`
[INFO] [stdout]   --> src/main.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | use tracing_subscriber::EnvFilter;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `walletb`
[INFO] [stdout]   --> src/network.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub async fn task1(walletb: &Arc<Mutex<Broadcast>>, message_receiver: &mut mpsc::Receiver<String>) -> Result<(), Box<dyn Error + Send + S...
[INFO] [stdout]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_walletb`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `walletb`
[INFO] [stdout]   --> src/network.rs:22:20
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub async fn task1(walletb: &Arc<Mutex<Broadcast>>, message_receiver: &mut mpsc::Receiver<String>) -> Result<(), Box<dyn Error + Send + S...
[INFO] [stdout]    |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_walletb`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `walletb`
[INFO] [stdout]    --> src/network.rs:117:20
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub async fn task2(walletb: &Arc<Mutex<Broadcast>>, message_sender: mpsc::Sender<String>) -> Result<(), Box<dyn Error + Send + Sync>> {
[INFO] [stdout]     |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_walletb`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Digest`
[INFO] [stdout]  --> src/wallet.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sha2::{Digest, Sha256};
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `stream::StreamExt`
[INFO] [stdout]   --> src/main.rs:13:15
[INFO] [stdout]    |
[INFO] [stdout] 13 | use futures::{stream::StreamExt};
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `walletb`
[INFO] [stdout]    --> src/network.rs:117:20
[INFO] [stdout]     |
[INFO] [stdout] 117 | pub async fn task2(walletb: &Arc<Mutex<Broadcast>>, message_sender: mpsc::Sender<String>) -> Result<(), Box<dyn Error + Send + Sync>> {
[INFO] [stdout]     |                    ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_walletb`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/transaction.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let message = format!("{} ECoins transferred from {} to {}.", output_val, from_wallet.get_address(), to_wallet.get_address());
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut bcwallet = Arc::new(Mutex::new(Broadcast::new(wallet)));
[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/main.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut bcwallet1 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut bcwallet2 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0597]: `bcwallet1` does not live long enough
[INFO] [stdout]   --> src/main.rs:36:32
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut bcwallet1 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ------------- binding `bcwallet1` declared here
[INFO] [stdout] ...
[INFO] [stdout] 36 |     let t1 = task::spawn(task1(&bcwallet1, &mut rx));
[INFO] [stdout]    |              ------------------^^^^^^^^^^-----------
[INFO] [stdout]    |              |                 |
[INFO] [stdout]    |              |                 borrowed value does not live long enough
[INFO] [stdout]    |              argument requires that `bcwallet1` is borrowed for `'static`
[INFO] [stdout] ...
[INFO] [stdout] 50 | }
[INFO] [stdout]    | - `bcwallet1` dropped here while still borrowed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `rx` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/main.rs:36:44
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let t1 = task::spawn(task1(&bcwallet1, &mut rx));
[INFO] [stdout]    |                                            ^^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (tx, mut rx) = mpsc::channel::<String>(100);
[INFO] [stdout]    |              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0597]: `bcwallet2` does not live long enough
[INFO] [stdout]   --> src/main.rs:37:32
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut bcwallet2 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ------------- binding `bcwallet2` declared here
[INFO] [stdout] ...
[INFO] [stdout] 37 |     let t2 = task::spawn(task2(&bcwallet2,tx));
[INFO] [stdout]    |              ------------------^^^^^^^^^^-----
[INFO] [stdout]    |              |                 |
[INFO] [stdout]    |              |                 borrowed value does not live long enough
[INFO] [stdout]    |              argument requires that `bcwallet2` is borrowed for `'static`
[INFO] [stdout] ...
[INFO] [stdout] 50 | }
[INFO] [stdout]    | - `bcwallet2` dropped here while still borrowed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0596, E0597.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Digest`
[INFO] [stdout]  --> src/wallet.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | use sha2::{Digest, Sha256};
[INFO] [stdout]   |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `stream::StreamExt`
[INFO] [stdout]   --> src/main.rs:13:15
[INFO] [stdout]    |
[INFO] [stdout] 13 | use futures::{stream::StreamExt};
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pow_blockchain` (bin "pow_blockchain") due to 3 previous errors; 19 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `message`
[INFO] [stdout]   --> src/transaction.rs:47:13
[INFO] [stdout]    |
[INFO] [stdout] 47 |         let message = format!("{} ECoins transferred from {} to {}.", output_val, from_wallet.get_address(), to_wallet.get_address());
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_message`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let mut bcwallet = Arc::new(Mutex::new(Broadcast::new(wallet)));
[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/main.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut bcwallet1 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut bcwallet2 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ----^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0597]: `bcwallet1` does not live long enough
[INFO] [stdout]   --> src/main.rs:36:32
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut bcwallet1 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ------------- binding `bcwallet1` declared here
[INFO] [stdout] ...
[INFO] [stdout] 36 |     let t1 = task::spawn(task1(&bcwallet1, &mut rx));
[INFO] [stdout]    |              ------------------^^^^^^^^^^-----------
[INFO] [stdout]    |              |                 |
[INFO] [stdout]    |              |                 borrowed value does not live long enough
[INFO] [stdout]    |              argument requires that `bcwallet1` is borrowed for `'static`
[INFO] [stdout] ...
[INFO] [stdout] 50 | }
[INFO] [stdout]    | - `bcwallet1` dropped here while still borrowed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `rx` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> src/main.rs:36:44
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let t1 = task::spawn(task1(&bcwallet1, &mut rx));
[INFO] [stdout]    |                                            ^^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (tx, mut rx) = mpsc::channel::<String>(100);
[INFO] [stdout]    |              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0597]: `bcwallet2` does not live long enough
[INFO] [stdout]   --> src/main.rs:37:32
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut bcwallet2 = Arc::clone(&bcwallet);
[INFO] [stdout]    |         ------------- binding `bcwallet2` declared here
[INFO] [stdout] ...
[INFO] [stdout] 37 |     let t2 = task::spawn(task2(&bcwallet2,tx));
[INFO] [stdout]    |              ------------------^^^^^^^^^^-----
[INFO] [stdout]    |              |                 |
[INFO] [stdout]    |              |                 borrowed value does not live long enough
[INFO] [stdout]    |              argument requires that `bcwallet2` is borrowed for `'static`
[INFO] [stdout] ...
[INFO] [stdout] 50 | }
[INFO] [stdout]    | - `bcwallet2` dropped here while still borrowed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0596, E0597.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pow_blockchain` (bin "pow_blockchain" test) due to 3 previous errors; 19 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "36bb1a9b112477ef53c6259155d2edfc1aea4e50dec146696a70aebc8c127d3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36bb1a9b112477ef53c6259155d2edfc1aea4e50dec146696a70aebc8c127d3e", kill_on_drop: false }`
[INFO] [stdout] 36bb1a9b112477ef53c6259155d2edfc1aea4e50dec146696a70aebc8c127d3e
