[INFO] cloning repository https://github.com/varex83/awesome-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/varex83/awesome-blockchain-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarex83%2Fawesome-blockchain-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvarex83%2Fawesome-blockchain-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 822bfe829eb5db1caf733824012746a4308868f4
[INFO] checking varex83/awesome-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%2Fvarex83%2Fawesome-blockchain-rust" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/varex83/awesome-blockchain-rust
[INFO] finished tweaking git repo https://github.com/varex83/awesome-blockchain-rust
[INFO] tweaked toml for git repo https://github.com/varex83/awesome-blockchain-rust written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/varex83/awesome-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/varex83/awesome-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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 20814b6e3cfdb2e55de4d282394ff8d301a4f67bb1d2ebe52a1299ee5416a49e
[INFO] running `Command { std: "docker" "start" "-a" "20814b6e3cfdb2e55de4d282394ff8d301a4f67bb1d2ebe52a1299ee5416a49e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20814b6e3cfdb2e55de4d282394ff8d301a4f67bb1d2ebe52a1299ee5416a49e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20814b6e3cfdb2e55de4d282394ff8d301a4f67bb1d2ebe52a1299ee5416a49e", kill_on_drop: false }`
[INFO] [stdout] 20814b6e3cfdb2e55de4d282394ff8d301a4f67bb1d2ebe52a1299ee5416a49e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 2fbe9bee5efb030c370f8c39d755955214776db79ab6a147da48b7ef6c023c04
[INFO] running `Command { std: "docker" "start" "-a" "2fbe9bee5efb030c370f8c39d755955214776db79ab6a147da48b7ef6c023c04", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]     Checking ppv-lite86 v0.2.14
[INFO] [stderr]     Checking signature v1.3.1
[INFO] [stderr]     Checking cpufeatures v0.2.1
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking num-complex v0.4.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking generic-array v0.14.4
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking blake2 v0.9.2
[INFO] [stderr]     Checking sha2 v0.9.8
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling zeroize_derive v1.2.0
[INFO] [stderr]     Checking zeroize v1.4.2
[INFO] [stderr]     Checking curve25519-dalek v3.2.0
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking blockchain_workshop v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `account_type` is never read
[INFO] [stdout]   --> src/types/account.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Account {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 11 |     account_type: AccountType,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Account` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `transaction_pool` is never read
[INFO] [stdout]   --> src/types/blockchain.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Blockchain {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 16 |     transaction_pool: Vec<Transaction>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Blockchain` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/types/chain.rs:69:17
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub fn iter(&self) -> ChainIter<T> {
[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] 69 |     pub fn iter(&self) -> ChainIter<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/types/chain.rs:75:21
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn iter_mut(&mut self) -> ChainIterMut<T> {
[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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn iter_mut(&mut self) -> ChainIterMut<'_, T> {
[INFO] [stdout]    |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/utils.rs:65:18
[INFO] [stdout]    |
[INFO] [stdout] 65 |     hex_target = hex_target[0..6].parse().unwrap();
[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_workshop` (lib) due to 1 previous error; 4 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: field `account_type` is never read
[INFO] [stdout]   --> src/types/account.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct Account {
[INFO] [stdout]    |            ------- field in this struct
[INFO] [stdout] 11 |     account_type: AccountType,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Account` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `transaction_pool` is never read
[INFO] [stdout]   --> src/types/blockchain.rs:16:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Blockchain {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 16 |     transaction_pool: Vec<Transaction>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Blockchain` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/types/chain.rs:69:17
[INFO] [stdout]    |
[INFO] [stdout] 69 |     pub fn iter(&self) -> ChainIter<T> {
[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] 69 |     pub fn iter(&self) -> ChainIter<'_, T> {
[INFO] [stdout]    |                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/types/chain.rs:75:21
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn iter_mut(&mut self) -> ChainIterMut<T> {
[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] help: use `'_` for type paths
[INFO] [stdout]    |
[INFO] [stdout] 75 |     pub fn iter_mut(&mut self) -> ChainIterMut<'_, T> {
[INFO] [stdout]    |                                                +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]   --> src/utils.rs:65:18
[INFO] [stdout]    |
[INFO] [stdout] 65 |     hex_target = hex_target[0..6].parse().unwrap();
[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_workshop` (lib test) due to 1 previous error; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "2fbe9bee5efb030c370f8c39d755955214776db79ab6a147da48b7ef6c023c04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fbe9bee5efb030c370f8c39d755955214776db79ab6a147da48b7ef6c023c04", kill_on_drop: false }`
[INFO] [stdout] 2fbe9bee5efb030c370f8c39d755955214776db79ab6a147da48b7ef6c023c04
