[INFO] cloning repository https://github.com/steephengeorge/rustlings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/steephengeorge/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteephengeorge%2Frustlings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteephengeorge%2Frustlings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2118acd43f54ebf9edbce7eb837b6aa37e58d04f
[INFO] checking steephengeorge/rustlings against master#cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsteephengeorge%2Frustlings" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-5-tc1/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/steephengeorge/rustlings
[INFO] finished tweaking git repo https://github.com/steephengeorge/rustlings
[INFO] tweaked toml for git repo https://github.com/steephengeorge/rustlings written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/steephengeorge/rustlings on toolchain cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/steephengeorge/rustlings 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" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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] 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]  Downloading crates ...
[INFO] [stderr]   Downloaded escargot v0.5.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4d3f04880ecc3a650e41f66bd9083a6214793a47ee3acf8393b55e892018ac73
[INFO] running `Command { std: "docker" "start" "-a" "4d3f04880ecc3a650e41f66bd9083a6214793a47ee3acf8393b55e892018ac73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4d3f04880ecc3a650e41f66bd9083a6214793a47ee3acf8393b55e892018ac73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4d3f04880ecc3a650e41f66bd9083a6214793a47ee3acf8393b55e892018ac73", kill_on_drop: false }`
[INFO] [stdout] 4d3f04880ecc3a650e41f66bd9083a6214793a47ee3acf8393b55e892018ac73
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+cf38b8e663f15db10ce49d7bbce02c99fc3dbc0c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 443eb62bd517b22fa62aa534648b4d1ac007d8242c1a905f0f48770628f1f440
[INFO] running `Command { std: "docker" "start" "-a" "443eb62bd517b22fa62aa534648b4d1ac007d8242c1a905f0f48770628f1f440", kill_on_drop: false }`
[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] 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 proc-macro2 v1.0.78
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]    Compiling serde_json v1.0.113
[INFO] [stderr]    Compiling escargot v0.5.8
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]     Checking itoa v1.0.10
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking once_cell v1.19.0
[INFO] [stderr]    Compiling libc v0.2.152
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/Macros/Procedural Macros/hello_macro)
[INFO] [stderr]     Checking process_some_strings v0.1.0 (/opt/rustwide/workdir/Common Collections/Strings/Process Some Strings)
[INFO] [stderr]     Checking from_into v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/From Into)
[INFO] [stderr]     Checking errors5 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Multiple Errors)
[INFO] [stdout] warning: unused import: `std::fmt::Pointer`
[INFO] [stdout]  --> Common Collections/Strings/Process Some Strings/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Pointer;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking combine_traits v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Combine Traits)
[INFO] [stderr]     Checking vec_trait v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Vec Trait)
[INFO] [stderr]     Checking errors6 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Custom Errors)
[INFO] [stderr]     Checking count_typed_cells v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Count Typed Cells)
[INFO] [stderr]     Checking advanced_errors_2 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Advanced Errors 2)
[INFO] [stderr]     Checking compare_licenses v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Compare Licenses)
[INFO] [stderr]     Checking declaring_a_vector v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Create a Vector on Your Own)
[INFO] [stderr]     Checking declaring_a_hashmap v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/Fruits Delivery)
[INFO] [stderr]     Checking modifying_a_hashmap v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/More Fruits)
[INFO] [stdout] warning: unused import: `write`
[INFO] [stdout]  --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:2:42
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::fmt::{self, Display, Formatter, write};
[INFO] [stdout]   |                                          ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking trait_bound_syntax v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Trait Bound Syntax)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 50 |             _ => write!(f, "unhandled error!"),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:50:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             Empty => write!(f, "empty input"),
[INFO] [stdout]    |             ----- matches some of the same values
[INFO] [stdout] 46 |             BadLen => write!(f, "incorrect number of fields"),
[INFO] [stdout]    |             ------ matches some of the same values
[INFO] [stdout] 47 |             NoCity => write!(f, "no city name"),
[INFO] [stdout]    |             ------ matches some of the same values
[INFO] [stdout] 48 |             ParseFloat(e) => write!(f, "error parsing temperature: {}", e),
[INFO] [stdout]    |             ------------- matches some of the same values
[INFO] [stdout] 49 |             ParseInt(e) => write!(f, "error parsing year: {}", e),
[INFO] [stdout] 50 |             _ => write!(f, "unhandled error!"),
[INFO] [stdout]    |             ^ ...and 1 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `year`
[INFO] [stdout]   --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:70:20
[INFO] [stdout]    |
[INFO] [stdout] 70 |             [city, year, temp] if city.is_empty() => return Err(ParseClimateError::NoCity),
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_year`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `temp`
[INFO] [stdout]   --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:70:26
[INFO] [stdout]    |
[INFO] [stdout] 70 |             [city, year, temp] if city.is_empty() => return Err(ParseClimateError::NoCity),
[INFO] [stdout]    |                          ^^^^ help: if this is intentional, prefix it with an underscore: `_temp`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking loop_over_vector_with_iterators v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Loop Over Vector With Iterators)
[INFO] [stderr]     Checking fromstr v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/FromStr)
[INFO] [stderr]     Checking lamp_with_switchers v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Switch the Lamp)
[INFO] [stderr]     Checking license_it v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/License It)
[INFO] [stdout] warning: unused import: `std::any::type_name`
[INFO] [stdout]  --> Standard Library Types/Type Conversions/FromStr/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::any::type_name;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking advanced_errors v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Advanced Errors)
[INFO] [stderr]     Checking trim_a_string v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/The Slice Type/Trim a String)
[INFO] [stderr]     Checking add_conditions v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Conditions/Add Conditions)
[INFO] [stderr]     Checking using_as v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/Using As)
[INFO] [stderr]     Checking try_from_into v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/Try From Into)
[INFO] [stderr]     Checking asref_and_asmut v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/AsRef and AsMut)
[INFO] [stderr]     Checking count_progress v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Count Progress)
[INFO] [stderr]     Checking box_task v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Box Task)
[INFO] [stderr]     Checking string_trait v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/String Trait)
[INFO] [stderr]     Checking generics_in_structs v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Generic Data Types/Generics in Structs)
[INFO] [stderr]     Checking string_transformer v0.1.0 (/opt/rustwide/workdir/Common Collections/Strings/String Transformer)
[INFO] [stderr]     Checking loop_over_a_vector v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Loop Over a Vector)
[INFO] [stderr]     Checking build_team_scores_table v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/Build Scores Table)
[INFO] [stderr]     Checking capitalize_first v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Capitalize first)
[INFO] [stderr]     Checking workers_in_the_engine v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Workers in the Engine)
[INFO] [stderr]     Checking home_alone v0.1.0 (/opt/rustwide/workdir/Modules/Modules/Home Alone at Day X)
[INFO] [stderr]     Checking use_cow v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Use Cow)
[INFO] [stderr]     Checking integration_tests v0.1.0 (/opt/rustwide/workdir/Writing Automated Tests/Running and Organizing Tests/Integration Tests)
[INFO] [stderr]     Checking iterator3 v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Iterator)
[INFO] [stderr]     Checking iterators4 v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Factorial)
[INFO] [stderr]     Checking result1 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Positive Nonzero Integer)
[INFO] [stderr]     Checking matching_result v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Matching Result)
[INFO] [stderr]     Checking times_two_tests v0.1.0 (/opt/rustwide/workdir/Writing Automated Tests/Running and Organizing Tests/Times Two Tests)
[INFO] [stderr]     Checking if_task v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Conditions/If Task)
[INFO] [stderr]     Checking calculate_price v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Variables, Functions, and Conditions Test/Calculate Price)
[INFO] [stderr]     Checking optional_value v0.1.0 (/opt/rustwide/workdir/Common Collections/Options/Optional Value)
[INFO] [stderr]     Checking returning_result v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Returning Result)
[INFO] [stderr]     Checking submodules v0.1.0 (/opt/rustwide/workdir/Writing Automated Tests/Running and Organizing Tests/Submodules in Integration Tests)
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking use_option v0.1.0 (/opt/rustwide/workdir/Common Collections/Options/Use Option)
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking getrandom v0.2.12
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking hashmaps v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/Intro)
[INFO] [stderr]     Checking the_glob_operator v0.1.0 (/opt/rustwide/workdir/Modules/Modules/The Glob Operator)
[INFO] [stderr]     Checking thinking_in_terms_of_lifetimes v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Lifetimes/Thinking in Terms of Lifetimes)
[INFO] [stderr]     Checking compound_types v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Tuples and Arrays/The Array Type)
[INFO] [stdout] warning: unused import: `std::collections::*`
[INFO] [stdout]  --> Modules/Modules/The Glob Operator/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking creating_instances_from_other_instances v0.1.0 (/opt/rustwide/workdir/Structs, Methods, Enums, and Pattern Matching/Structs/Creating Instances From Other Instances)
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Thinking in Terms of Lifetimes/src/main.rs:1:28
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn longest<'a>(x: &'a str, y: &str) -> &'a str {
[INFO] [stdout]   |                            ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Thinking in Terms of Lifetimes/src/main.rs:5:17
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn longest2<'a>(x: &str, y: &str) -> &'a str {
[INFO] [stdout]   |                 ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Thinking in Terms of Lifetimes/src/main.rs:5:26
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn longest2<'a>(x: &str, y: &str) -> &'a str {
[INFO] [stdout]   |                          ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing local variable `result`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Thinking in Terms of Lifetimes/src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     result.as_str()
[INFO] [stdout]   |     ------^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     returns a value referencing data owned by the current function
[INFO] [stdout]   |     `result` is borrowed here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking catch_all_patterns_and_the___placeholder v0.1.0 (/opt/rustwide/workdir/Structs, Methods, Enums, and Pattern Matching/Pattern Matching/Catch-all Patterns and the _ Placeholder)
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thinking_in_terms_of_lifetimes` (bin "thinking_in_terms_of_lifetimes") due to 1 previous error; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]  --> Common Programming Concepts/Tuples and Arrays/The Array Type/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let first = a[0];
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `second`
[INFO] [stdout]  --> Common Programming Concepts/Tuples and Arrays/The Array Type/src/main.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let second = a[1];
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `email`, `sign_in_count`, and `active` are never read
[INFO] [stdout]  --> Structs, Methods, Enums, and Pattern Matching/Structs/Creating Instances From Other Instances/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct User {
[INFO] [stdout]   |        ---- fields in this struct
[INFO] [stdout] 2 |     username: String,
[INFO] [stdout] 3 |     email: String,
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 4 |     sign_in_count: u64,
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 5 |     active: bool,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "443eb62bd517b22fa62aa534648b4d1ac007d8242c1a905f0f48770628f1f440", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "443eb62bd517b22fa62aa534648b4d1ac007d8242c1a905f0f48770628f1f440", kill_on_drop: false }`
[INFO] [stdout] 443eb62bd517b22fa62aa534648b4d1ac007d8242c1a905f0f48770628f1f440