[INFO] cloning repository https://github.com/Elianagam/blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Elianagam/blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FElianagam%2Fblockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FElianagam%2Fblockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 16af333f91d0a37dd8dadccd24e67988e3394ae6
[INFO] checking Elianagam/blockchain against 895980e0290783bb09b1ccf1b11f14eb09b10430 for pr-160186
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FElianagam%2Fblockchain" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Elianagam/blockchain
[INFO] finished tweaking git repo https://github.com/Elianagam/blockchain
[INFO] tweaked toml for git repo https://github.com/Elianagam/blockchain written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Elianagam/blockchain on toolchain 895980e0290783bb09b1ccf1b11f14eb09b10430
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Elianagam/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" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e
[INFO] running `Command { std: "docker" "start" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e" "/opt/rustwide/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e" "/opt/rustwide/cargo-home/bin/cargo" "+895980e0290783bb09b1ccf1b11f14eb09b10430" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]     Checking std-semaphore v0.1.0
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking blake2 v0.9.1
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `pending_records` is never read
[INFO] [stdout]   --> src/blockchain/blockchain.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Blockchain {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pending_records: Vec<Record>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Blockchain` 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: methods `get_student_ids`, `get_student_by_id_mut`, and `get_student_by_id` are never used
[INFO] [stdout]   --> src/blockchain/world_state.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout]  5 | pub trait WorldState {
[INFO] [stdout]    |           ---------- methods in this trait
[INFO] [stdout]  6 |     /// Returns all registered student ids
[INFO] [stdout]  7 |     fn get_student_ids(&self) -> Vec<String>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn get_student_by_id_mut(&mut self, id: &String) -> Option<&mut Student>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn get_student_by_id(&self, id: &String) -> Option<&Student>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]  --> src/encoder.rs:7:39
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut message = String::from(msg.clone());
[INFO] [stdout]   |                                       ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]   |
[INFO] [stdout]   = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout]   = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `pending_records` is never read
[INFO] [stdout]   --> src/blockchain/blockchain.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Blockchain {
[INFO] [stdout]    |            ---------- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 21 |     pending_records: Vec<Record>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Blockchain` 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: methods `get_student_ids`, `get_student_by_id_mut`, and `get_student_by_id` are never used
[INFO] [stdout]   --> src/blockchain/world_state.rs:7:8
[INFO] [stdout]    |
[INFO] [stdout]  5 | pub trait WorldState {
[INFO] [stdout]    |           ---------- methods in this trait
[INFO] [stdout]  6 |     /// Returns all registered student ids
[INFO] [stdout]  7 |     fn get_student_ids(&self) -> Vec<String>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn get_student_by_id_mut(&mut self, id: &String) -> Option<&mut Student>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 13 |     fn get_student_by_id(&self, id: &String) -> Option<&Student>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]  --> src/encoder.rs:7:39
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut message = String::from(msg.clone());
[INFO] [stdout]   |                                       ^^^^^^^^ help: remove this redundant call
[INFO] [stdout]   |
[INFO] [stdout]   = note: the type `str` does not implement `Clone`, so calling `clone` on `&str` copies the reference, which does not do anything and can be removed
[INFO] [stdout]   = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.84s
[INFO] running `Command { std: "docker" "inspect" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e", kill_on_drop: false }`
[INFO] [stdout] 0510fa26cfbb0bf70990cb92c6809d645a90903dd07e2450fe232a14d0440c4e
