[INFO] cloning repository https://github.com/rlkelly/minimum-viable-blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rlkelly/minimum-viable-blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frlkelly%2Fminimum-viable-blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frlkelly%2Fminimum-viable-blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1d9e5c28ee4995ba16d501c42d9d5d7577f19fe4
[INFO] testing rlkelly/minimum-viable-blockchain against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frlkelly%2Fminimum-viable-blockchain" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rlkelly/minimum-viable-blockchain on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rlkelly/minimum-viable-blockchain
[INFO] finished tweaking git repo https://github.com/rlkelly/minimum-viable-blockchain
[INFO] tweaked toml for git repo https://github.com/rlkelly/minimum-viable-blockchain written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/rlkelly/minimum-viable-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" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand v0.6.4
[INFO] [stderr]   Downloaded tokio-sync v0.1.0
[INFO] [stderr]   Downloaded secp256k1 v0.12.2
[INFO] [stderr]   Downloaded rand v0.4.5
[INFO] [stderr]   Downloaded bitcoin-bech32 v0.8.1
[INFO] [stderr]   Downloaded bech32 v0.5.0
[INFO] [stderr]   Downloaded bitcoin v0.16.0
[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" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3ab292d41805672f1d5e96e5c2fbddc1cc2545de203b6ce5e0ecbc5d28863556
[INFO] running `Command { std: "docker" "start" "-a" "3ab292d41805672f1d5e96e5c2fbddc1cc2545de203b6ce5e0ecbc5d28863556", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3ab292d41805672f1d5e96e5c2fbddc1cc2545de203b6ce5e0ecbc5d28863556", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ab292d41805672f1d5e96e5c2fbddc1cc2545de203b6ce5e0ecbc5d28863556", kill_on_drop: false }`
[INFO] [stdout] 3ab292d41805672f1d5e96e5c2fbddc1cc2545de203b6ce5e0ecbc5d28863556
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fbccab3788966f17f4432ae1d5e17d45ffc7c4a364b8aa65276144a3e9e22c07
[INFO] running `Command { std: "docker" "start" "-a" "fbccab3788966f17f4432ae1d5e17d45ffc7c4a364b8aa65276144a3e9e22c07", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.48
[INFO] [stderr]    Compiling cfg-if v0.1.6
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling futures v0.1.25
[INFO] [stderr]    Compiling stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling lazy_static v1.2.0
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling lazycell v1.2.1
[INFO] [stderr]    Compiling nodrop v0.1.13
[INFO] [stderr]    Compiling memoffset v0.2.1
[INFO] [stderr]    Compiling crossbeam-utils v0.6.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling owning_ref v0.4.0
[INFO] [stderr]    Compiling log v0.4.6
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.26
[INFO] [stderr]    Compiling serde v1.0.85
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]    Compiling cc v1.0.26
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.4
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling ryu v0.2.7
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling bech32 v0.5.0
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling hex v0.3.2
[INFO] [stderr]    Compiling itoa v0.4.3
[INFO] [stderr]    Compiling rand_os v0.1.1
[INFO] [stderr]    Compiling iovec v0.1.2
[INFO] [stderr]    Compiling num_cpus v1.9.0
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling bytes v0.4.11
[INFO] [stderr]    Compiling crossbeam-epoch v0.7.0
[INFO] [stderr]    Compiling rand v0.4.5
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling quote v0.6.11
[INFO] [stderr]    Compiling mio v0.6.16
[INFO] [stderr]    Compiling crossbeam-deque v0.6.3
[INFO] [stderr]    Compiling secp256k1 v0.12.2
[INFO] [stderr]    Compiling tokio-executor v0.1.6
[INFO] [stderr]    Compiling tokio-io v0.1.11
[INFO] [stderr]    Compiling num-traits v0.1.43
[INFO] [stderr]    Compiling tokio-sync v0.1.0
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling tokio-timer v0.2.9
[INFO] [stderr]    Compiling tokio-current-thread v0.1.4
[INFO] [stderr]    Compiling rmp v0.8.7
[INFO] [stderr]    Compiling bitcoin-bech32 v0.8.1
[INFO] [stderr]    Compiling scoped-tls v0.1.2
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling tokio-codec v0.1.1
[INFO] [stderr]    Compiling mio-uds v0.6.7
[INFO] [stderr]    Compiling parking_lot v0.7.1
[INFO] [stderr]    Compiling crossbeam-channel v0.3.6
[INFO] [stderr]    Compiling tokio-reactor v0.1.8
[INFO] [stderr]    Compiling tokio-uds v0.2.5
[INFO] [stderr]    Compiling tokio-udp v0.1.3
[INFO] [stderr]    Compiling tokio-tcp v0.1.3
[INFO] [stderr]    Compiling crossbeam v0.6.0
[INFO] [stderr]    Compiling tokio-threadpool v0.1.11
[INFO] [stderr]    Compiling serde_derive v1.0.85
[INFO] [stderr]    Compiling tokio-fs v0.1.5
[INFO] [stderr]    Compiling tokio v0.1.15
[INFO] [stderr]    Compiling serde_json v1.0.37
[INFO] [stderr]    Compiling rmp-serde v0.13.7
[INFO] [stderr]    Compiling tokio-core v0.1.17
[INFO] [stderr]    Compiling bitcoin v0.16.0
[INFO] [stderr]    Compiling blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/consensus/node.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stdout]    |                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/chain/block.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/consensus/node.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stdout]    |                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/chain/block.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.73s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "fbccab3788966f17f4432ae1d5e17d45ffc7c4a364b8aa65276144a3e9e22c07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fbccab3788966f17f4432ae1d5e17d45ffc7c4a364b8aa65276144a3e9e22c07", kill_on_drop: false }`
[INFO] [stdout] fbccab3788966f17f4432ae1d5e17d45ffc7c4a364b8aa65276144a3e9e22c07
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e273a20b638619120bbd673f071fa961c9cb0a0cef767fd8f60154ad19123a0b
[INFO] running `Command { std: "docker" "start" "-a" "e273a20b638619120bbd673f071fa961c9cb0a0cef767fd8f60154ad19123a0b", kill_on_drop: false }`
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/consensus/node.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stdout]    |                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/chain/block.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/consensus/node.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stdout]    |                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/consensus/node.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stdout]    |                   ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stdout]    |                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/chain/block.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/chain/block.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.54s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "e273a20b638619120bbd673f071fa961c9cb0a0cef767fd8f60154ad19123a0b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e273a20b638619120bbd673f071fa961c9cb0a0cef767fd8f60154ad19123a0b", kill_on_drop: false }`
[INFO] [stdout] e273a20b638619120bbd673f071fa961c9cb0a0cef767fd8f60154ad19123a0b
[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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "+1.75.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 44efcf1ca0e464348e34010cec061b7714cbfa012a11fd4d51c9de3cffd9d07b
[INFO] running `Command { std: "docker" "start" "-a" "44efcf1ca0e464348e34010cec061b7714cbfa012a11fd4d51c9de3cffd9d07b", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/consensus/node.rs:40:19
[INFO] [stderr]    |
[INFO] [stderr] 40 |         (self as &fmt::Display).fmt(f)
[INFO] [stderr]    |                   ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 40 |         (self as &dyn fmt::Display).fmt(f)
[INFO] [stderr]    |                   +++
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/chain/block.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |         &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 61 |         let _ = &self.transactions.retain(|trans| trans.verify(&blockchain));
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `blockchain` (lib) generated 2 warnings (run `cargo fix --lib -p blockchain` to apply 1 suggestion)
[INFO] [stderr] warning: `blockchain` (lib test) generated 2 warnings (2 duplicates)
[INFO] [stderr] warning: `blockchain` (bin "main" test) generated 2 warnings (2 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rustc-serialize v0.3.24
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/blockchain-79f05f22e978b169)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/main-e6ffb26af7ce4638)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/wallet.rs (/opt/rustwide/target/debug/deps/wallet-72a899494fef0669)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests blockchain
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "44efcf1ca0e464348e34010cec061b7714cbfa012a11fd4d51c9de3cffd9d07b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44efcf1ca0e464348e34010cec061b7714cbfa012a11fd4d51c9de3cffd9d07b", kill_on_drop: false }`
[INFO] [stdout] 44efcf1ca0e464348e34010cec061b7714cbfa012a11fd4d51c9de3cffd9d07b
