[INFO] cloning repository https://github.com/prithvisingh18/exchange-cache [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/prithvisingh18/exchange-cache" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprithvisingh18%2Fexchange-cache", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprithvisingh18%2Fexchange-cache'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] bed40fb788e59414b329e2094390bf96a1e1a8a4 [INFO] checking prithvisingh18/exchange-cache against try#377afada703be70d3fdff9164a481570a3cba7fe for pr-113240 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fprithvisingh18%2Fexchange-cache" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/prithvisingh18/exchange-cache on toolchain 377afada703be70d3fdff9164a481570a3cba7fe [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+377afada703be70d3fdff9164a481570a3cba7fe" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/prithvisingh18/exchange-cache [INFO] finished tweaking git repo https://github.com/prithvisingh18/exchange-cache [INFO] tweaked toml for git repo https://github.com/prithvisingh18/exchange-cache written to /workspace/builds/worker-2-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/prithvisingh18/exchange-cache 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" "+377afada703be70d3fdff9164a481570a3cba7fe" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:a420fdec406141845121210faa381f8029b0be6d4170deff7c4445a424f67918" "/opt/rustwide/cargo-home/bin/cargo" "+377afada703be70d3fdff9164a481570a3cba7fe" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] fac3b6ba734a32f7a90a9ba3abe977533f0b701d9481d9e0086c4985daee0a4d [INFO] running `Command { std: "docker" "start" "-a" "fac3b6ba734a32f7a90a9ba3abe977533f0b701d9481d9e0086c4985daee0a4d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "fac3b6ba734a32f7a90a9ba3abe977533f0b701d9481d9e0086c4985daee0a4d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fac3b6ba734a32f7a90a9ba3abe977533f0b701d9481d9e0086c4985daee0a4d", kill_on_drop: false }` [INFO] [stdout] fac3b6ba734a32f7a90a9ba3abe977533f0b701d9481d9e0086c4985daee0a4d [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:a420fdec406141845121210faa381f8029b0be6d4170deff7c4445a424f67918" "/opt/rustwide/cargo-home/bin/cargo" "+377afada703be70d3fdff9164a481570a3cba7fe" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] f043765b6e87ab6ce17dc359a7c95c5680aae6df077f7539d1110a1ab2233b47 [INFO] running `Command { std: "docker" "start" "-a" "f043765b6e87ab6ce17dc359a7c95c5680aae6df077f7539d1110a1ab2233b47", 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] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Compiling libc v0.2.126 [INFO] [stderr] Compiling proc-macro2 v1.0.42 [INFO] [stderr] Compiling quote v1.0.20 [INFO] [stderr] Compiling unicode-ident v1.0.2 [INFO] [stderr] Compiling syn v1.0.98 [INFO] [stderr] Compiling log v0.4.17 [INFO] [stderr] Compiling futures-core v0.3.21 [INFO] [stderr] Checking once_cell v1.13.0 [INFO] [stderr] Checking bytes v1.2.0 [INFO] [stderr] Compiling parking_lot_core v0.9.3 [INFO] [stderr] Checking futures-sink v0.3.21 [INFO] [stderr] Compiling futures-channel v0.3.21 [INFO] [stderr] Compiling lock_api v0.4.7 [INFO] [stderr] Compiling slab v0.4.7 [INFO] [stderr] Checking smallvec v1.9.0 [INFO] [stderr] Compiling futures-task v0.3.21 [INFO] [stderr] Compiling tokio v1.20.1 [INFO] [stderr] Compiling futures-util v0.3.21 [INFO] [stderr] Checking itoa v1.0.2 [INFO] [stderr] Compiling version_check v0.9.4 [INFO] [stderr] Checking futures-io v0.3.21 [INFO] [stderr] Checking tracing-core v0.1.28 [INFO] [stderr] Compiling serde v1.0.140 [INFO] [stderr] Checking bitflags v1.3.2 [INFO] [stderr] Compiling pkg-config v0.3.25 [INFO] [stderr] Compiling indexmap v1.9.1 [INFO] [stderr] Checking http v0.2.8 [INFO] [stderr] Compiling typenum v1.15.0 [INFO] [stderr] Checking hashbrown v0.12.3 [INFO] [stderr] Checking percent-encoding v2.1.0 [INFO] [stderr] Compiling httparse v1.7.1 [INFO] [stderr] Checking matches v0.1.9 [INFO] [stderr] Compiling generic-array v0.14.5 [INFO] [stderr] Checking tinyvec_macros v0.1.0 [INFO] [stderr] Compiling openssl v0.10.41 [INFO] [stderr] Checking httpdate v1.0.2 [INFO] [stderr] Checking tower-service v0.3.2 [INFO] [stderr] Checking tracing v0.1.35 [INFO] [stderr] Checking tinyvec v1.6.0 [INFO] [stderr] Checking form_urlencoded v1.0.1 [INFO] [stderr] Checking aho-corasick v0.7.18 [INFO] [stderr] Compiling memchr v2.5.0 [INFO] [stderr] Compiling num-traits v0.2.15 [INFO] [stderr] Checking num_cpus v1.13.1 [INFO] [stderr] Checking socket2 v0.4.4 [INFO] [stderr] Checking mio v0.8.4 [INFO] [stderr] Checking parking_lot v0.12.1 [INFO] [stderr] Checking signal-hook-registry v1.4.0 [INFO] [stderr] Checking getrandom v0.2.7 [INFO] [stderr] Checking try-lock v0.2.3 [INFO] [stderr] Compiling encoding_rs v0.8.31 [INFO] [stderr] Compiling zstd-safe v5.0.2+zstd.1.5.2 [INFO] [stderr] Checking regex-syntax v0.6.27 [INFO] [stderr] Compiling jobserver v0.1.24 [INFO] [stderr] Checking http-body v0.4.5 [INFO] [stderr] Checking ryu v1.0.10 [INFO] [stderr] Checking local-waker v0.1.3 [INFO] [stderr] Compiling native-tls v0.2.10 [INFO] [stderr] Compiling crc32fast v1.3.2 [INFO] [stderr] Checking mime v0.3.16 [INFO] [stderr] Compiling cc v1.0.73 [INFO] [stderr] Checking alloc-no-stdlib v2.0.3 [INFO] [stderr] Checking rand_core v0.6.3 [INFO] [stderr] Checking alloc-stdlib v0.2.1 [INFO] [stderr] Checking want v0.3.0 [INFO] [stderr] Compiling ahash v0.7.6 [INFO] [stderr] Compiling num-integer v0.1.45 [INFO] [stderr] Compiling async-trait v0.1.57 [INFO] [stderr] Checking unicode-bidi v0.3.8 [INFO] [stderr] Checking openssl-probe v0.1.5 [INFO] [stderr] Compiling cfg-if v1.0.0 [INFO] [stderr] Compiling paste v1.0.7 [INFO] [stderr] Checking unicode-normalization v0.1.21 [INFO] [stderr] Checking ppv-lite86 v0.2.16 [INFO] [stderr] Compiling fnv v1.0.7 [INFO] [stderr] Checking adler v1.0.2 [INFO] [stderr] Compiling serde_json v1.0.82 [INFO] [stderr] Checking miniz_oxide v0.5.3 [INFO] [stderr] Checking rand_chacha v0.3.1 [INFO] [stderr] Compiling bytestring v1.1.0 [INFO] [stderr] Checking idna v0.2.3 [INFO] [stderr] Checking actix-service v2.0.2 [INFO] [stderr] Checking brotli-decompressor v2.3.2 [INFO] [stderr] Checking actix-utils v3.0.0 [INFO] [stderr] Compiling cookie v0.16.0 [INFO] [stderr] Compiling convert_case v0.4.0 [INFO] [stderr] Checking base64 v0.13.0 [INFO] [stderr] Compiling time-macros v0.2.4 [INFO] [stderr] Checking tower-layer v0.3.1 [INFO] [stderr] Checking cpufeatures v0.2.2 [INFO] [stderr] Checking num_threads v0.1.6 [INFO] [stderr] Compiling firestorm v0.5.1 [INFO] [stderr] Checking block-buffer v0.10.2 [INFO] [stderr] Checking crypto-common v0.1.6 [INFO] [stderr] Checking quick-error v1.2.3 [INFO] [stderr] Checking url v2.2.2 [INFO] [stderr] Checking humantime v1.3.0 [INFO] [stderr] Checking flate2 v1.0.24 [INFO] [stderr] Checking digest v0.10.3 [INFO] [stderr] Checking rand v0.8.5 [INFO] [stderr] Checking regex v1.6.0 [INFO] [stderr] Compiling openssl-sys v0.9.75 [INFO] [stderr] Compiling zstd-sys v2.0.1+zstd.1.5.2 [INFO] [stderr] Checking sha1 v0.10.1 [INFO] [stderr] Checking brotli v3.3.4 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking termcolor v1.1.3 [INFO] [stderr] Checking language-tags v0.3.2 [INFO] [stderr] Checking http-range-header v0.3.0 [INFO] [stderr] Checking sync_wrapper v0.1.1 [INFO] [stderr] Checking ipnet v2.5.0 [INFO] [stderr] Checking lazy_static v1.4.0 [INFO] [stderr] Checking chrono v0.4.19 [INFO] [stderr] Checking matchit v0.5.0 [INFO] [stderr] Checking env_logger v0.6.2 [INFO] [stderr] Checking serde_urlencoded v0.7.1 [INFO] [stderr] Checking time v0.3.12 [INFO] [stderr] Checking actix-router v0.5.0 [INFO] [stderr] Checking pretty_env_logger v0.3.1 [INFO] [stderr] Compiling tokio-macros v1.8.0 [INFO] [stderr] Compiling futures-macro v0.3.21 [INFO] [stderr] Compiling openssl-macros v0.1.0 [INFO] [stderr] Compiling pin-project-internal v1.0.11 [INFO] [stderr] Compiling derive_more v0.99.17 [INFO] [stderr] Compiling actix-web-codegen v4.0.1 [INFO] [stderr] Compiling actix-macros v0.2.3 [INFO] [stderr] Checking pin-project v1.0.11 [INFO] [stderr] Checking local-channel v0.1.3 [INFO] [stderr] Checking futures-executor v0.3.21 [INFO] [stderr] Checking axum-core v0.2.7 [INFO] [stderr] Checking futures v0.3.21 [INFO] [stderr] Checking tokio-util v0.7.3 [INFO] [stderr] Checking actix-rt v2.7.0 [INFO] [stderr] Checking tower v0.4.13 [INFO] [stderr] Checking tokio-native-tls v0.3.0 [INFO] [stderr] Checking actix-server v2.1.1 [INFO] [stderr] Checking h2 v0.3.13 [INFO] [stderr] Checking actix-codec v0.5.0 [INFO] [stderr] Checking tower-http v0.3.4 [INFO] [stderr] Checking hyper v0.14.20 [INFO] [stderr] Checking zstd v0.11.2+zstd.1.5.2 [INFO] [stderr] Checking actix-http v3.2.1 [INFO] [stderr] Checking hyper-tls v0.5.0 [INFO] [stderr] Checking axum v0.5.13 [INFO] [stderr] Checking actix-web v4.1.0 [INFO] [stderr] Checking reqwest v0.11.11 [INFO] [stderr] Checking exchange-cache v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `futures::executor::block_on` [INFO] [stdout] --> src/get_exchange_rates.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | use futures::executor::block_on; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around assigned value [INFO] [stdout] --> src/get_exchange_rates.rs:158:39 [INFO] [stdout] | [INFO] [stdout] 158 | let mut converted_currency: f64 = (value / r[&from_currency]); [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` on by default [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 158 - let mut converted_currency: f64 = (value / r[&from_currency]); [INFO] [stdout] 158 + let mut converted_currency: f64 = value / r[&from_currency]; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `futures::executor::block_on` [INFO] [stdout] --> src/get_exchange_rates.rs:9:5 [INFO] [stdout] | [INFO] [stdout] 9 | use futures::executor::block_on; [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unnecessary parentheses around assigned value [INFO] [stdout] --> src/get_exchange_rates.rs:158:39 [INFO] [stdout] | [INFO] [stdout] 158 | let mut converted_currency: f64 = (value / r[&from_currency]); [INFO] [stdout] | ^ ^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_parens)]` on by default [INFO] [stdout] help: remove these parentheses [INFO] [stdout] | [INFO] [stdout] 158 - let mut converted_currency: f64 = (value / r[&from_currency]); [INFO] [stdout] 158 + let mut converted_currency: f64 = value / r[&from_currency]; [INFO] [stdout] | [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/get_exchange_rates.rs:65:9 [INFO] [stdout] | [INFO] [stdout] 65 | let mut parsed_values: serde_json::Value = match serde_json::from_str(&response_body) { [INFO] [stdout] | ----^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/get_exchange_rates.rs:72:9 [INFO] [stdout] | [INFO] [stdout] 72 | let mut crypto_rate_map = loop { [INFO] [stdout] | ----^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:106:17 [INFO] [stdout] | [INFO] [stdout] 106 | Err(error) => return Err("Error opening file.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:111:17 [INFO] [stdout] | [INFO] [stdout] 111 | Err(error) => return Err("Error opening exchange rates.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:122:17 [INFO] [stdout] | [INFO] [stdout] 122 | Err(error) => return Err("Error creating file.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:127:17 [INFO] [stdout] | [INFO] [stdout] 127 | Err(error) => return Err("Error creating map string.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:132:17 [INFO] [stdout] | [INFO] [stdout] 132 | Err(error) => return Err("error syncing".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:145:13 [INFO] [stdout] | [INFO] [stdout] 145 | Err(error) => return Err("error geting exchange rates".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/get_exchange_rates.rs:65:9 [INFO] [stdout] | [INFO] [stdout] 65 | let mut parsed_values: serde_json::Value = match serde_json::from_str(&response_body) { [INFO] [stdout] | ----^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/get_exchange_rates.rs:72:9 [INFO] [stdout] | [INFO] [stdout] 72 | let mut crypto_rate_map = loop { [INFO] [stdout] | ----^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:106:17 [INFO] [stdout] | [INFO] [stdout] 106 | Err(error) => return Err("Error opening file.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:111:17 [INFO] [stdout] | [INFO] [stdout] 111 | Err(error) => return Err("Error opening exchange rates.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:122:17 [INFO] [stdout] | [INFO] [stdout] 122 | Err(error) => return Err("Error creating file.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:127:17 [INFO] [stdout] | [INFO] [stdout] 127 | Err(error) => return Err("Error creating map string.".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:132:17 [INFO] [stdout] | [INFO] [stdout] 132 | Err(error) => return Err("error syncing".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `error` [INFO] [stdout] --> src/get_exchange_rates.rs:145:13 [INFO] [stdout] | [INFO] [stdout] 145 | Err(error) => return Err("error geting exchange rates".to_string()), [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_error` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/get_exchange_rates.rs:129:9 [INFO] [stdout] | [INFO] [stdout] 129 | exchange_rate_file.write_all(exchange_rate_string.as_bytes()); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 129 | let _ = exchange_rate_file.write_all(exchange_rate_string.as_bytes()); [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused `Result` that must be used [INFO] [stdout] --> src/get_exchange_rates.rs:129:9 [INFO] [stdout] | [INFO] [stdout] 129 | exchange_rate_file.write_all(exchange_rate_string.as_bytes()); [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stdout] = note: `#[warn(unused_must_use)]` on by default [INFO] [stdout] help: use `let _ = ...` to ignore the resulting value [INFO] [stdout] | [INFO] [stdout] 129 | let _ = exchange_rate_file.write_all(exchange_rate_string.as_bytes()); [INFO] [stdout] | +++++++ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 11 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1m 19s [INFO] running `Command { std: "docker" "inspect" "f043765b6e87ab6ce17dc359a7c95c5680aae6df077f7539d1110a1ab2233b47", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f043765b6e87ab6ce17dc359a7c95c5680aae6df077f7539d1110a1ab2233b47", kill_on_drop: false }` [INFO] [stdout] f043765b6e87ab6ce17dc359a7c95c5680aae6df077f7539d1110a1ab2233b47