[INFO] cloning repository https://github.com/Neotamandua/orderbook
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Neotamandua/orderbook" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeotamandua%2Forderbook", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeotamandua%2Forderbook'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 71e64efea138fdec48bcee8e59b07da47e96bb8b
[INFO] checking Neotamandua/orderbook against try#438eb4c1a1c3841523d7f672601e8adbe04cff28 for pr-147589-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNeotamandua%2Forderbook" "/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/Neotamandua/orderbook
[INFO] finished tweaking git repo https://github.com/Neotamandua/orderbook
[INFO] tweaked toml for git repo https://github.com/Neotamandua/orderbook written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Neotamandua/orderbook on toolchain 438eb4c1a1c3841523d7f672601e8adbe04cff28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /workspace/builds/worker-6-tc2/source/grpc-service/Cargo.toml
[INFO] [stderr] workspace: /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /workspace/builds/worker-6-tc2/source/orderbookX/Cargo.toml
[INFO] [stderr] workspace: /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 363 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.5.1 (available: v0.7.0)
[INFO] [stderr]       Adding prost v0.11.9 (available: v0.14.1)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[INFO] [stderr]       Adding test-strategy v0.3.1 (available: v0.4.3)
[INFO] [stderr]       Adding tonic v0.9.2 (available: v0.14.2)
[INFO] [stderr]       Adding tonic-build v0.9.2 (available: v0.14.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /workspace/builds/worker-6-tc2/source/grpc-service/Cargo.toml
[INFO] [stderr] workspace: /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /workspace/builds/worker-6-tc2/source/orderbookX/Cargo.toml
[INFO] [stderr] workspace: /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 265aa8ea51a50e77fd0bc6cac36250ef45a223f3e9835ef895a037fbcd5a5285
[INFO] running `Command { std: "docker" "start" "-a" "265aa8ea51a50e77fd0bc6cac36250ef45a223f3e9835ef895a037fbcd5a5285", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "265aa8ea51a50e77fd0bc6cac36250ef45a223f3e9835ef895a037fbcd5a5285", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "265aa8ea51a50e77fd0bc6cac36250ef45a223f3e9835ef895a037fbcd5a5285", kill_on_drop: false }`
[INFO] [stdout] 265aa8ea51a50e77fd0bc6cac36250ef45a223f3e9835ef895a037fbcd5a5285
[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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+438eb4c1a1c3841523d7f672601e8adbe04cff28" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fe227541ddabf24c410d47f1a4a218a52c4a8f4ffab6f90fde48cac45083974f
[INFO] running `Command { std: "docker" "start" "-a" "fe227541ddabf24c410d47f1a4a218a52c4a8f4ffab6f90fde48cac45083974f", kill_on_drop: false }`
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /opt/rustwide/workdir/grpc-service/Cargo.toml
[INFO] [stderr] workspace: /opt/rustwide/workdir/Cargo.toml
[INFO] [stderr] warning: profiles for the non root package will be ignored, specify profiles at the workspace root:
[INFO] [stderr] package:   /opt/rustwide/workdir/orderbookX/Cargo.toml
[INFO] [stderr] workspace: /opt/rustwide/workdir/Cargo.toml
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling quote v1.0.41
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[INFO] [stderr]    Compiling home v0.5.11
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[INFO] [stderr]     Checking h2 v0.3.27
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[INFO] [stderr]     Checking cargo_metadata v0.22.0
[INFO] [stderr]    Compiling prettyplease v0.1.25
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[INFO] [stderr]    Compiling pin-project-internal v1.1.10
[INFO] [stderr]     Checking flamegraph v0.6.9
[INFO] [stderr]    Compiling axum-core v0.3.4
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[INFO] [stderr]     Checking tower-layer v0.3.3
[INFO] [stderr]    Compiling lazy_static v1.5.0
[INFO] [stderr]    Compiling async-trait v0.1.89
[INFO] [stderr]    Compiling axum v0.6.20
[INFO] [stderr]    Compiling prost-build v0.11.9
[INFO] [stderr]     Checking orderbook-x v0.1.0 (/opt/rustwide/workdir/orderbookX)
[INFO] [stderr]     Checking tokio-io-timeout v1.2.1
[INFO] [stderr]     Checking matchit v0.7.3
[INFO] [stderr]     Checking tokio-stream v0.1.17
[INFO] [stderr]     Checking hyper v0.14.32
[INFO] [stdout] warning: use of deprecated method `indexmap::IndexMap::<K, V, S>::remove_entry`: `remove_entry` disrupts the map order -- use `swap_remove_entry` or `shift_remove_entry` for explicit behavior.
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:173:28
[INFO] [stdout]     |
[INFO] [stdout] 173 |                 order_book.remove_entry(remove_order.get_price());
[INFO] [stdout]     |                            ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking matchers v0.2.0
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:14
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `qty`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:22
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |                      ^^^ help: if this is intentional, prefix it with an underscore: `_qty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filled`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:27
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |                           ^^^^^^ help: if this is intentional, prefix it with an underscore: `_filled`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:14
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `qty`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:22
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |                      ^^^ help: if this is intentional, prefix it with an underscore: `_qty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filled`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:27
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |                           ^^^^^^ help: if this is intentional, prefix it with an underscore: `_filled`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:546:42
[INFO] [stdout]     |
[INFO] [stdout] 546 |     fn limit_or_cancel_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:553:46
[INFO] [stdout]     |
[INFO] [stdout] 553 |     fn immediate_or_cancel_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:560:39
[INFO] [stdout]     |
[INFO] [stdout] 560 |     fn fill_or_kill_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stdout] warning: method `len` is never used
[INFO] [stdout]   --> orderbookX/src/orderbook/orders.rs:56:19
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl OrderList {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 56 |     pub(crate) fn len(&self) -> usize {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking thread_local v1.1.9
[INFO] [stderr]     Checking nu-ansi-term v0.50.3
[INFO] [stderr]     Checking pin-project v1.1.10
[INFO] [stderr]     Checking tracing-subscriber v0.3.20
[INFO] [stderr]     Checking tower v0.4.13
[INFO] [stderr]    Compiling tonic-build v0.9.2
[INFO] [stdout] error: zero-sized fields in `repr(transparent)` cannot contain external non-exhaustive types
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/hyper-0.14.32/src/proto/h2/mod.rs:451:5
[INFO] [stdout]     |
[INFO] [stdout] 451 |     impossible: Impossible,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this field contains `Impossible`, which is not inhabited, and makes it not a breaking change to become non-zero-sized in the future.
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling grpc-service v0.1.0 (/opt/rustwide/workdir/grpc-service)
[INFO] [stdout] warning: unused imports: `Level` and `event`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:574:19
[INFO] [stdout]     |
[INFO] [stdout] 574 |     use tracing::{event, Level};
[INFO] [stdout]     |                   ^^^^^  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `EnvFilter` and `FmtSubscriber`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:575:30
[INFO] [stdout]     |
[INFO] [stdout] 575 |     use tracing_subscriber::{EnvFilter, FmtSubscriber};
[INFO] [stdout]     |                              ^^^^^^^^^  ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `indexmap::IndexMap::<K, V, S>::remove_entry`: `remove_entry` disrupts the map order -- use `swap_remove_entry` or `shift_remove_entry` for explicit behavior.
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:173:28
[INFO] [stdout]     |
[INFO] [stdout] 173 |                 order_book.remove_entry(remove_order.get_price());
[INFO] [stdout]     |                            ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:14
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `qty`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:22
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |                      ^^^ help: if this is intentional, prefix it with an underscore: `_qty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filled`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:532:27
[INFO] [stdout]     |
[INFO] [stdout] 532 |         let (result, qty, filled, order) = self.market_buy_until(order);
[INFO] [stdout]     |                           ^^^^^^ help: if this is intentional, prefix it with an underscore: `_filled`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:14
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `qty`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:22
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |                      ^^^ help: if this is intentional, prefix it with an underscore: `_qty`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `filled`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:540:27
[INFO] [stdout]     |
[INFO] [stdout] 540 |         let (result, qty, filled, order) = self.market_sell_until(order);
[INFO] [stdout]     |                           ^^^^^^ help: if this is intentional, prefix it with an underscore: `_filled`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:546:42
[INFO] [stdout]     |
[INFO] [stdout] 546 |     fn limit_or_cancel_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:553:46
[INFO] [stdout]     |
[INFO] [stdout] 553 |     fn immediate_or_cancel_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:560:39
[INFO] [stdout]     |
[INFO] [stdout] 560 |     fn fill_or_kill_insert(&mut self, order: Order, order_type: OrderType) {
[INFO] [stdout]     |                                       ^^^^^ help: if this is intentional, prefix it with an underscore: `_order`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `order_book`
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:593:17
[INFO] [stdout]     |
[INFO] [stdout] 593 |             let order_book = fill_bids_pseudorandom();
[INFO] [stdout]     |                 ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_order_book`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `len` is never used
[INFO] [stdout]   --> orderbookX/src/orderbook/orders.rs:56:19
[INFO] [stdout]    |
[INFO] [stdout] 55 | impl OrderList {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 56 |     pub(crate) fn len(&self) -> usize {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `initialize_tracing` is never used
[INFO] [stdout]    --> orderbookX/src/orderbook.rs:578:8
[INFO] [stdout]     |
[INFO] [stdout] 578 |     fn initialize_tracing() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `hyper` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "fe227541ddabf24c410d47f1a4a218a52c4a8f4ffab6f90fde48cac45083974f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fe227541ddabf24c410d47f1a4a218a52c4a8f4ffab6f90fde48cac45083974f", kill_on_drop: false }`
[INFO] [stdout] fe227541ddabf24c410d47f1a4a218a52c4a8f4ffab6f90fde48cac45083974f