[INFO] cloning repository https://github.com/nguquen/blockchain_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nguquen/blockchain_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnguquen%2Fblockchain_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnguquen%2Fblockchain_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b4f1c8ee07db6714d93fab22a008072d38a7f1b2
[INFO] checking nguquen/blockchain_rust against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnguquen%2Fblockchain_rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nguquen/blockchain_rust
[INFO] finished tweaking git repo https://github.com/nguquen/blockchain_rust
[INFO] tweaked toml for git repo https://github.com/nguquen/blockchain_rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/nguquen/blockchain_rust on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nguquen/blockchain_rust 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 18a819a415fe53c222c066808dcde26a420badab42b482dff97e144dadb05445
[INFO] running `Command { std: "docker" "start" "-a" "18a819a415fe53c222c066808dcde26a420badab42b482dff97e144dadb05445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "18a819a415fe53c222c066808dcde26a420badab42b482dff97e144dadb05445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18a819a415fe53c222c066808dcde26a420badab42b482dff97e144dadb05445", kill_on_drop: false }`
[INFO] [stdout] 18a819a415fe53c222c066808dcde26a420badab42b482dff97e144dadb05445
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8260d87f583f9a58ee8b919b2c88b8819e2c2e74cffa7316b1d90709c6d4524e
[INFO] running `Command { std: "docker" "start" "-a" "8260d87f583f9a58ee8b919b2c88b8819e2c2e74cffa7316b1d90709c6d4524e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling pkg-config v0.3.20
[INFO] [stderr]    Compiling num-bigint v0.4.2
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]     Checking instant v0.1.11
[INFO] [stderr]    Compiling openssl v0.10.36
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking once_cell v1.8.0
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]    Compiling openssl-sys v0.9.67
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking parking_lot_core v0.8.5
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking parking_lot v0.11.2
[INFO] [stderr]     Checking sled v0.34.7
[INFO] [stderr]     Checking num-rational v0.4.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking crypto-hash v0.3.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling structopt-derive v0.4.16
[INFO] [stderr]     Checking structopt v0.3.23
[INFO] [stderr]     Checking serde v1.0.130
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking blockchain_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/blockchain.rs:74:17
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn iter(&self) -> BlockchainIterator {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn iter(&self) -> BlockchainIterator<'_> {
[INFO] [stdout]    |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/blockchain.rs:74:17
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn iter(&self) -> BlockchainIterator {
[INFO] [stdout]    |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 the lifetime is elided here
[INFO] [stdout]    |
[INFO] [stdout]    = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]    = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub fn iter(&self) -> BlockchainIterator<'_> {
[INFO] [stdout]    |                                             ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | /         #[structopt(long = "address")]
[INFO] [stdout] 13 | |         address: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | /         #[structopt(long = "address")]
[INFO] [stdout] 13 | |         address: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blockchain_rust` (lib) due to 4 previous errors; 1 warning emitted
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 | /         #[structopt(long = "address")]
[INFO] [stdout] 19 | |         address: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 | /         #[structopt(long = "address")]
[INFO] [stdout] 19 | |         address: String,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | /         #[structopt(long = "from")]
[INFO] [stdout] 25 | |         from: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 | /         #[structopt(long = "from")]
[INFO] [stdout] 25 | |         from: String,
[INFO] [stdout]    | |____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 | /         #[structopt(long = "to")]
[INFO] [stdout] 27 | |         to: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<std::string::String, Infallible>
[INFO] [stdout]   --> src/cli.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 | /         #[structopt(long = "to")]
[INFO] [stdout] 27 | |         to: String,
[INFO] [stdout]    | |__________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blockchain_rust` (lib test) due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "8260d87f583f9a58ee8b919b2c88b8819e2c2e74cffa7316b1d90709c6d4524e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8260d87f583f9a58ee8b919b2c88b8819e2c2e74cffa7316b1d90709c6d4524e", kill_on_drop: false }`
[INFO] [stdout] 8260d87f583f9a58ee8b919b2c88b8819e2c2e74cffa7316b1d90709c6d4524e
