[INFO] cloning repository https://github.com/ganeshchand/learn-rust-yourself
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ganeshchand/learn-rust-yourself" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fganeshchand%2Flearn-rust-yourself", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fganeshchand%2Flearn-rust-yourself'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a5cb17e314beae84a83e3830a898cc77432d402a
[INFO] checking ganeshchand/learn-rust-yourself against try#5ec4d3b0c83717313176eefa7d71e9d36dc83355 for 155501-infallible-never-no-reservation
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fganeshchand%2Flearn-rust-yourself" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ganeshchand/learn-rust-yourself
[INFO] finished tweaking git repo https://github.com/ganeshchand/learn-rust-yourself
[INFO] tweaked toml for git repo https://github.com/ganeshchand/learn-rust-yourself written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ganeshchand/learn-rust-yourself on toolchain 5ec4d3b0c83717313176eefa7d71e9d36dc83355
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5ec4d3b0c83717313176eefa7d71e9d36dc83355" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ganeshchand/learn-rust-yourself 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" "+5ec4d3b0c83717313176eefa7d71e9d36dc83355" "fetch" "--manifest-path" "Cargo.toml", 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] 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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+5ec4d3b0c83717313176eefa7d71e9d36dc83355" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39cee899e6b99790a409bf2a6a0848314914312cb16c925c284ce8e6c9a26c08
[INFO] running `Command { std: "docker" "start" "-a" "39cee899e6b99790a409bf2a6a0848314914312cb16c925c284ce8e6c9a26c08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39cee899e6b99790a409bf2a6a0848314914312cb16c925c284ce8e6c9a26c08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39cee899e6b99790a409bf2a6a0848314914312cb16c925c284ce8e6c9a26c08", kill_on_drop: false }`
[INFO] [stdout] 39cee899e6b99790a409bf2a6a0848314914312cb16c925c284ce8e6c9a26c08
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+5ec4d3b0c83717313176eefa7d71e9d36dc83355" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a239d1d926612a9dacad43b7dc02d7598c485915425d797f40727f25f21fcafc
[INFO] running `Command { std: "docker" "start" "-a" "a239d1d926612a9dacad43b7dc02d7598c485915425d797f40727f25f21fcafc", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-with-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `unit_struct`
[INFO] [stdout]   --> src/structs.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let unit_struct = UnitStruct;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named struct `UnitStruct`
[INFO] [stdout]    |
[INFO] [stdout] 77 -     let unit_struct = UnitStruct;
[INFO] [stdout] 77 +     let main::UnitStruct = UnitStruct;
[INFO] [stdout]    |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let _unit_struct = UnitStruct;
[INFO] [stdout]    |         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `clock`
[INFO] [stdout]   --> src/structs.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let clock = Clock::Analog {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_clock`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `country` is never read
[INFO] [stdout]   --> src/structs.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     struct SoccerPlayer {
[INFO] [stdout]    |            ------------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 24 |         country: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Goalkeeper`, `Defender`, and `Midfielder` are never constructed
[INFO] [stdout]   --> src/structs.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     enum Position {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 29 |         Goalkeeper,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 30 |         Defender,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 31 |         Midfielder,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Position` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `1` and `2` are never read
[INFO] [stdout]   --> src/structs.rs:53:26
[INFO] [stdout]    |
[INFO] [stdout] 53 |     struct Triangle(u32, u32, u32);
[INFO] [stdout]    |            --------      ^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |     struct Country(String);
[INFO] [stdout]    |            ------- ^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/structs.rs:60:16
[INFO] [stdout]    |
[INFO] [stdout] 60 |     struct Age(u8);
[INFO] [stdout]    |            --- ^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `1` and `2` are never read
[INFO] [stdout]   --> src/structs.rs:62:25
[INFO] [stdout]    |
[INFO] [stdout] 62 |     struct Person(Name, Country, Age);
[INFO] [stdout]    |            ------       ^^^^^^^  ^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `hours`, `minutes`, and `seconds` are never read
[INFO] [stdout]   --> src/structs.rs:86:18
[INFO] [stdout]    |
[INFO] [stdout] 86 |         Analog { hours: u8, minutes: u8, seconds: u8 },
[INFO] [stdout]    |         ------   ^^^^^      ^^^^^^^      ^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         fields in this variant
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Sundial` and `Digital` are never constructed
[INFO] [stdout]   --> src/structs.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 83 |     enum Clock {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 84 |         Sundial { hours: u8 },
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 85 |         Digital { hours: u8, minutes: u8 },
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i8 = 10; // 8 bits : first bit is sign bit (0 = positive, 1 = negative), remaining 7 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/primitive_data_types.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: i16 = 10; // 16 bits : first bit is sign bit (0 = positive, 1 = negative), remaining 15 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let c: u8 = 10; // 8 bits : all 8 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first_element`
[INFO] [stdout]   --> src/primitive_data_types.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let first_element = a[0]; // 100 - here the index 0 is of type usize because it is an array.
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let a = 10; // i32
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let a = 10.2; // f64
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let a = 10.2; // f64 - default
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let c: f32 = 10.2; // f32
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let c = 'z';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/primitive_data_types.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let z = 'ℤ';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `unit_struct`
[INFO] [stdout]   --> src/structs.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let unit_struct = UnitStruct;
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: you might have meant to pattern match on the similarly named struct `UnitStruct`
[INFO] [stdout]    |
[INFO] [stdout] 77 -     let unit_struct = UnitStruct;
[INFO] [stdout] 77 +     let main::UnitStruct = UnitStruct;
[INFO] [stdout]    |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let _unit_struct = UnitStruct;
[INFO] [stdout]    |         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `clock`
[INFO] [stdout]   --> src/structs.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 88 |     let clock = Clock::Analog {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_clock`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Goalkeeper`, `Defender`, and `Midfielder` are never constructed
[INFO] [stdout]   --> src/methods.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     enum Position {
[INFO] [stdout]    |          -------- variants in this enum
[INFO] [stdout] 18 |         Goalkeeper,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout] 19 |         Defender,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 20 |         Midfielder,
[INFO] [stdout]    |         ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `club` and `country` are never read
[INFO] [stdout]   --> src/methods.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     struct SoccerPlayer {
[INFO] [stdout]    |            ------------ fields in this struct
[INFO] [stdout] 25 |         name: String,
[INFO] [stdout] 26 |         club: String,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 27 |         position: Position,
[INFO] [stdout] 28 |         country: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Down`, `Left`, and `Right` are never constructed
[INFO] [stdout]   --> src/enums.rs:19:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     enum Direction {
[INFO] [stdout]    |          --------- variants in this enum
[INFO] [stdout] 18 |         Up,
[INFO] [stdout] 19 |         Down,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 20 |         Left,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] 21 |         Right,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let a: i8 = 10; // 8 bits : first bit is sign bit (0 = positive, 1 = negative), remaining 7 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/primitive_data_types.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let b: i16 = 10; // 16 bits : first bit is sign bit (0 = positive, 1 = negative), remaining 15 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let c: u8 = 10; // 8 bits : all 8 bits are for the number
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first_element`
[INFO] [stdout]   --> src/primitive_data_types.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let first_element = a[0]; // 100 - here the index 0 is of type usize because it is an array.
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_element`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:41:9
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let a = 10; // i32
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 44 |     let a = 10.2; // f64
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]   --> src/primitive_data_types.rs:51:9
[INFO] [stdout]    |
[INFO] [stdout] 51 |     let a = 10.2; // f64 - default
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:52:9
[INFO] [stdout]    |
[INFO] [stdout] 52 |     let c: f32 = 10.2; // f32
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/primitive_data_types.rs:56:9
[INFO] [stdout]    |
[INFO] [stdout] 56 |     let c = 'z';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/primitive_data_types.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |     let z = 'ℤ';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.60s
[INFO] running `Command { std: "docker" "inspect" "a239d1d926612a9dacad43b7dc02d7598c485915425d797f40727f25f21fcafc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a239d1d926612a9dacad43b7dc02d7598c485915425d797f40727f25f21fcafc", kill_on_drop: false }`
[INFO] [stdout] a239d1d926612a9dacad43b7dc02d7598c485915425d797f40727f25f21fcafc
