[INFO] cloning repository https://github.com/austinkaylor-eaton/Learn-Rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/austinkaylor-eaton/Learn-Rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustinkaylor-eaton%2FLearn-Rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustinkaylor-eaton%2FLearn-Rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] beaebfb4eaf8016f72b2d6d4001f842402a44480
[INFO] checking austinkaylor-eaton/Learn-Rust against master#cf79d034aa3d8f396d407aafce6f1ccd818e710e for pr-155657-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustinkaylor-eaton%2FLearn-Rust" "/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/austinkaylor-eaton/Learn-Rust
[INFO] finished tweaking git repo https://github.com/austinkaylor-eaton/Learn-Rust
[INFO] tweaked toml for git repo https://github.com/austinkaylor-eaton/Learn-Rust written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/austinkaylor-eaton/Learn-Rust on toolchain cf79d034aa3d8f396d407aafce6f1ccd818e710e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/austinkaylor-eaton/Learn-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" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "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]   |
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro2 v1.0.92
[INFO] [stderr]   Downloaded itoa v1.0.14
[INFO] [stderr]   Downloaded serde_json v1.0.133
[INFO] [stderr]   Downloaded escargot v0.5.13
[INFO] [stderr]   Downloaded unicode-ident v1.0.14
[INFO] [stderr]   Downloaded serde v1.0.216
[INFO] [stderr]   Downloaded serde_derive v1.0.216
[INFO] [stderr]   Downloaded syn v2.0.90
[INFO] [stderr]   Downloaded libc v0.2.168
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] def0f0f8183724e14dd285c3420191dd5384a0e95ab70dc2ece3ff92d34ea5be
[INFO] running `Command { std: "docker" "start" "-a" "def0f0f8183724e14dd285c3420191dd5384a0e95ab70dc2ece3ff92d34ea5be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "def0f0f8183724e14dd285c3420191dd5384a0e95ab70dc2ece3ff92d34ea5be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "def0f0f8183724e14dd285c3420191dd5384a0e95ab70dc2ece3ff92d34ea5be", kill_on_drop: false }`
[INFO] [stdout] def0f0f8183724e14dd285c3420191dd5384a0e95ab70dc2ece3ff92d34ea5be
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f68cc62aecbd09f30efdc41540ba7c6ae0d3455fa533420e9d415f04ad1c06c7
[INFO] running `Command { std: "docker" "start" "-a" "f68cc62aecbd09f30efdc41540ba7c6ae0d3455fa533420e9d415f04ad1c06c7", 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]   |
[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 v1.0.92
[INFO] [stderr]    Compiling unicode-ident v1.0.14
[INFO] [stderr]    Compiling serde v1.0.216
[INFO] [stderr]    Compiling serde_json v1.0.133
[INFO] [stderr]     Checking ryu v1.0.18
[INFO] [stderr]     Checking itoa v1.0.14
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]    Compiling escargot v0.5.13
[INFO] [stderr]     Checking once_cell v1.20.2
[INFO] [stderr]     Checking log v0.4.22
[INFO] [stderr]    Compiling libc v0.2.168
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking byteorder v1.5.0
[INFO] [stderr]     Checking hello_macro v0.1.0 (/opt/rustwide/workdir/Macros/Procedural Macros/hello_macro)
[INFO] [stderr]     Checking advanced_errors_2 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Advanced Errors 2)
[INFO] [stderr]     Checking fromstr v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/FromStr)
[INFO] [stderr]     Checking errors5 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Multiple Errors)
[INFO] [stderr]     Checking combine_traits v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Combine Traits)
[INFO] [stderr]     Checking declaring_a_vector v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Create a Vector on Your Own)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> Error Handling/Errors Primer/Advanced Errors 2/src/lib.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |             _ => 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:49:13
[INFO] [stdout]    |
[INFO] [stdout] 44 |             NoCity => write!(f, "no city name"),
[INFO] [stdout]    |             ------ matches some of the same values
[INFO] [stdout] 45 |             ParseFloat(e) => write!(f, "error parsing temperature: {}", e),
[INFO] [stdout]    |             ------------- matches some of the same values
[INFO] [stdout] 46 |             Empty => write!(f, "empty input"),
[INFO] [stdout]    |             ----- matches some of the same values
[INFO] [stdout] 47 |             BadLen => write!(f, "incorrect number of fields"),
[INFO] [stdout]    |             ------ matches some of the same values
[INFO] [stdout] 48 |             ParseInt(e) => write!(f, "error parsing year: {}", e),
[INFO] [stdout] 49 |             _ => write!(f, "unhandled error!"),
[INFO] [stdout]    |             ^ ...and 1 other patterns collectively make this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking trim_a_string v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/The Slice Type/Trim a String)
[INFO] [stderr]     Checking modifying_a_hashmap v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/More Fruits)
[INFO] [stderr]     Checking process_some_strings v0.1.0 (/opt/rustwide/workdir/Common Collections/Strings/Process Some Strings)
[INFO] [stderr]     Checking asref_and_asmut v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/AsRef and AsMut)
[INFO] [stderr]     Checking declaring_a_hashmap v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/Fruits Delivery)
[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 from_into v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/From Into)
[INFO] [stderr]     Checking lamp_with_switchers v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Switch the Lamp)
[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 errors6 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Custom Errors)
[INFO] [stderr]     Checking vec_trait v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Vec Trait)
[INFO] [stderr]     Checking count_typed_cells v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Count Typed Cells)
[INFO] [stderr]     Checking loop_over_a_vector v0.1.0 (/opt/rustwide/workdir/Common Collections/Vectors/Loop Over a Vector)
[INFO] [stderr]     Checking using_as v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/Using As)
[INFO] [stderr]     Checking capitalize_first v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Capitalize first)
[INFO] [stderr]     Checking compare_licenses v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Compare Licenses)
[INFO] [stderr]     Checking license_it v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/License It)
[INFO] [stderr]     Checking add_conditions v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Conditions/Add Conditions)
[INFO] [stderr]     Checking trait_bound_syntax v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Trait Bound Syntax)
[INFO] [stderr]     Checking count_progress v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Count Progress)
[INFO] [stderr]     Checking build_team_scores_table v0.1.0 (/opt/rustwide/workdir/Common Collections/Hashmaps/Build Scores Table)
[INFO] [stderr]     Checking try_from_into v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Type Conversions/Try From Into)
[INFO] [stderr]     Checking string_transformer v0.1.0 (/opt/rustwide/workdir/Common Collections/Strings/String Transformer)
[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 advanced_errors v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Advanced Errors)
[INFO] [stderr]     Checking use_cow v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Smart Pointers/Use Cow)
[INFO] [stderr]     Checking home_alone v0.1.0 (/opt/rustwide/workdir/Modules/Modules/Home Alone at Day X)
[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 if_task v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Conditions/If Task)
[INFO] [stderr]     Checking iterator3 v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Iterator)
[INFO] [stderr]     Checking result1 v0.1.0 (/opt/rustwide/workdir/Error Handling/Errors Primer/Positive Nonzero Integer)
[INFO] [stderr]     Checking use_option v0.1.0 (/opt/rustwide/workdir/Common Collections/Options/Use Option)
[INFO] [stderr]     Checking submodules v0.1.0 (/opt/rustwide/workdir/Writing Automated Tests/Running and Organizing Tests/Submodules in Integration Tests)
[INFO] [stderr]     Checking integration_tests v0.1.0 (/opt/rustwide/workdir/Writing Automated Tests/Running and Organizing Tests/Integration Tests)
[INFO] [stderr]     Checking optional_value v0.1.0 (/opt/rustwide/workdir/Common Collections/Options/Optional Value)
[INFO] [stderr]     Checking matching_result v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Matching Result)
[INFO] [stderr]     Checking calculate_price v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Variables, Functions, and Conditions Test/Calculate Price)
[INFO] [stderr]     Checking returning_result v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Returning Result)
[INFO] [stderr]     Checking iterators4 v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Iterators/Factorial)
[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 getrandom v0.2.15
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]  --> Error Handling/Errors Primer/Multiple Errors/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::ParseIntError;
[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 import: `std::str::Matches`
[INFO] [stdout]  --> Error Handling/Errors Primer/Multiple Errors/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::str::Matches;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::num::ParseIntError`
[INFO] [stdout]  --> Error Handling/Errors Primer/Multiple Errors/src/main.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::ParseIntError;
[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 import: `std::str::Matches`
[INFO] [stdout]  --> Error Handling/Errors Primer/Multiple Errors/src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::str::Matches;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking using_message_passing_to_transfer_data_between_threads v0.1.0 (/opt/rustwide/workdir/Fearless Concurrency/Using Message Passing to Transfer Data Between Threads/Intro)
[INFO] [stderr]     Checking moving_captured_values_out_of_the_closure_and_the_fn_traits v0.1.0 (/opt/rustwide/workdir/Standard Library Types/Closures/Moving Captured Values Out of the Closure and the Fn Traits)
[INFO] [stderr]     Checking function_like_macros v0.1.0 (/opt/rustwide/workdir/Macros/Procedural Macros/Function-like macros)
[INFO] [stderr]     Checking enums_intro v0.1.0 (/opt/rustwide/workdir/Structs, Methods, Enums, and Pattern Matching/Enums/Intro)
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking intro_using_threads v0.1.0 (/opt/rustwide/workdir/Fearless Concurrency/Using Threads to Run Code Simultaneously/Intro)
[INFO] [stderr]     Checking macros3 v0.1.0 (/opt/rustwide/workdir/Macros/Declarative Macros/Outside of Module)
[INFO] [stderr]     Checking mixing_generic_types v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Generic Data Types/Mixing Generic Types)
[INFO] [stderr]     Checking if_intro v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Conditions/Intro)
[INFO] [stderr]     Checking implement_a_macro v0.1.0 (/opt/rustwide/workdir/Macros/Declarative Macros/Implement a Macro)
[INFO] [stderr]     Checking exposing_paths_with_the_pub_keyword v0.1.0 (/opt/rustwide/workdir/Modules/Modules/Exposing Paths with the pub Keyword)
[INFO] [stderr]     Checking a_shortcut_for_propagating_errors v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/A Shortcut for Propagating Errors)
[INFO] [stderr]     Checking calling_methods_without_default_implementations v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Traits/Calling Methods Without Default Implementations)
[INFO] [stderr]     Checking integer_types v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Basic Data Types/Integer Types)
[INFO] [stderr]     Checking lifetime_annotation_syntax v0.1.0 (/opt/rustwide/workdir/Generic Types, Traits, and Lifetime/Lifetimes/Lifetime Annotation Syntax)
[INFO] [stderr]     Checking making_structs_and_enums_public v0.1.0 (/opt/rustwide/workdir/Modules/Modules/Making Structs and Enums Public)
[INFO] [stderr]     Checking restriction_of_mutable_references v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/References and Borrowing/Restriction of Mutable References)
[INFO] [stderr]     Checking matches_are_exhaustive v0.1.0 (/opt/rustwide/workdir/Structs, Methods, Enums, and Pattern Matching/Pattern Matching/Matches Are Exhaustive)
[INFO] [stderr]     Checking ownership_and_functions v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/What is ownership/Ownership and Functions)
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Lifetime Annotation Syntax/src/main.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let r1: &i32;        // a reference
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r2`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Lifetime Annotation Syntax/src/main.rs:3:9
[INFO] [stdout]   |
[INFO] [stdout] 3 |     let r2: &'a i32;     // a reference with an explicit lifetime
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r3`
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Lifetime Annotation Syntax/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let r3: &'a mut i32; // a mutable reference with an explicit lifetime
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `lifetime_examples` is never used
[INFO] [stdout]  --> Generic Types, Traits, and Lifetime/Lifetimes/Lifetime Annotation Syntax/src/main.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn lifetime_examples<'a>() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking scopes_of_references v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/References and Borrowing/Scopes of References)
[INFO] [stderr]     Checking shadowing v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Variables/Shadowing)
[INFO] [stderr]     Checking moving_a_transmitting_end v0.1.0 (/opt/rustwide/workdir/Fearless Concurrency/Using Message Passing to Transfer Data Between Threads/Sending Values)
[INFO] [stderr]     Checking recoverable_errors_with_result v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Recoverable Errors with Result)
[INFO] [stderr]     Checking shortcuts_for_panic_on_error___unwrap_and_expect v0.1.0 (/opt/rustwide/workdir/Error Handling/Error Handling/Shortcuts for Panic on Error - unwrap and expect)
[INFO] [stdout] warning: function `seat_at_table` is never used
[INFO] [stdout]  --> Modules/Modules/Exposing Paths with the pub Keyword/src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |         fn seat_at_table() {}
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking build_string_from_literals v0.1.0 (/opt/rustwide/workdir/Understanding Ownership/What is ownership/Build String from Literals)
[INFO] [stdout] warning: unused variable: `order1`
[INFO] [stdout]   --> Modules/Modules/Making Structs and Enums Public/src/lib.rs:33:9
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let order1 = back_of_house::Appetizer::Soup;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order1`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking macros2 v0.1.0 (/opt/rustwide/workdir/Macros/Declarative Macros/Declaring a Macro)
[INFO] [stdout] warning: unused variable: `order2`
[INFO] [stdout]   --> Modules/Modules/Making Structs and Enums Public/src/lib.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let order2 = back_of_house::Appetizer::Salad;
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_order2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `seasonal_fruit` is never read
[INFO] [stdout]  --> Modules/Modules/Making Structs and Enums Public/src/lib.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub struct Breakfast {
[INFO] [stdout]   |                --------- field in this struct
[INFO] [stdout] 3 |         pub toast: String,
[INFO] [stdout] 4 |         seasonal_fruit: String,
[INFO] [stdout]   |         ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking defining_an_enum v0.1.0 (/opt/rustwide/workdir/Structs, Methods, Enums, and Pattern Matching/Enums/Defining an Enum)
[INFO] [stderr]     Checking return_a_value v0.1.0 (/opt/rustwide/workdir/Common Programming Concepts/Functions/Return a Value)
[INFO] [stderr]     Checking task_description v0.1.0 (/opt/rustwide/workdir/Introduction/Getting started/Task Description)
[INFO] [stdout] error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable
[INFO] [stdout]  --> Understanding Ownership/References and Borrowing/Restriction of Mutable References/src/main.rs:6:14
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let r1 = &s; // no problem
[INFO] [stdout]   |              -- immutable borrow occurs here
[INFO] [stdout] 5 |     let r2 = &s; // no problem
[INFO] [stdout] 6 |     let r3 = &mut s; // BIG PROBLEM
[INFO] [stdout]   |              ^^^^^^ mutable borrow occurs here
[INFO] [stdout] 7 |
[INFO] [stdout] 8 |     println!("{}, {}, and {}", r1, r2, r3);
[INFO] [stdout]   |                                -- immutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> Error Handling/Error Handling/Recoverable Errors with Result/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let f = match f {
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking the_difference_between_macros_and_functions v0.1.0 (/opt/rustwide/workdir/Macros/Intro/The Difference Between Macros and Functions)
[INFO] [stderr] error: could not compile `restriction_of_mutable_references` (bin "restriction_of_mutable_references" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]  --> Error Handling/Error Handling/A Shortcut for Propagating Errors/src/main.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn read_username_from_file() -> Result<String, io::Error> {
[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 `read_username_from_file_2` is never used
[INFO] [stdout]   --> Error Handling/Error Handling/A Shortcut for Propagating Errors/src/main.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn read_username_from_file_2() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file_3` is never used
[INFO] [stdout]   --> Error Handling/Error Handling/A Shortcut for Propagating Errors/src/main.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn read_username_from_file_3() -> Result<String, io::Error> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> Error Handling/Error Handling/Shortcuts for Panic on Error - unwrap and expect/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let f = File::open("hello.txt").unwrap();
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> Error Handling/Error Handling/Shortcuts for Panic on Error - unwrap and expect/src/main.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let f = File::open("hello.txt").expect("Failed to open hello.txt");
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ip_kind`
[INFO] [stdout]  --> Structs, Methods, Enums, and Pattern Matching/Enums/Defining an Enum/src/main.rs:6:10
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn route(ip_kind: IpAddrKind) {}
[INFO] [stdout]   |          ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ip_kind`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]  --> Fearless Concurrency/Using Message Passing to Transfer Data Between Threads/Sending Values/src/main.rs:5:14
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let (tx, rx) = mpsc::channel();
[INFO] [stdout]   |              ^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f68cc62aecbd09f30efdc41540ba7c6ae0d3455fa533420e9d415f04ad1c06c7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f68cc62aecbd09f30efdc41540ba7c6ae0d3455fa533420e9d415f04ad1c06c7", kill_on_drop: false }`
[INFO] [stdout] f68cc62aecbd09f30efdc41540ba7c6ae0d3455fa533420e9d415f04ad1c06c7
