[INFO] cloning repository https://github.com/kamikaze/rust-training
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kamikaze/rust-training" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamikaze%2Frust-training", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamikaze%2Frust-training'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a2b458d4d932fac86680a8383ac31614ed3618df
[INFO] checking kamikaze/rust-training/a2b458d4d932fac86680a8383ac31614ed3618df against try#bf5ff6675cf10ce009ac02007b064a7cfc4509ac for pr-140558
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkamikaze%2Frust-training" "/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/kamikaze/rust-training on toolchain bf5ff6675cf10ce009ac02007b064a7cfc4509ac
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bf5ff6675cf10ce009ac02007b064a7cfc4509ac" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kamikaze/rust-training
[INFO] finished tweaking git repo https://github.com/kamikaze/rust-training
[INFO] tweaked toml for git repo https://github.com/kamikaze/rust-training written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kamikaze/rust-training 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" "+bf5ff6675cf10ce009ac02007b064a7cfc4509ac" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+bf5ff6675cf10ce009ac02007b064a7cfc4509ac" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "start" "-a" "572a23aa7cce2976afb44523686476cf66e3b03b6596b6a01dac4f1ef55652dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "572a23aa7cce2976afb44523686476cf66e3b03b6596b6a01dac4f1ef55652dd", kill_on_drop: false }`
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[INFO] [stdout] error[E0277]: the trait bound `Vec<u8>: Seek` is not satisfied
[INFO] [stdout]    --> src/async_channel.rs:136:14
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer()
[INFO] [stdout]     |              ^^^^^^^^^^^^^ the trait `Seek` is not implemented for `Vec<u8>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: required for `&mut Vec<u8>` to implement `Seek`
[INFO] [stdout] note: required by a bound in `tar::Builder::<W>::append_writer`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tar-0.4.43/src/builder.rs:222:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn append_writer<'a, P: AsRef<Path>>(
[INFO] [stdout]     |            ------------- required by a bound in this associated function
[INFO] [stdout] ...
[INFO] [stdout] 222 |         W: Seek,
[INFO] [stdout]     |            ^^^^ required by this bound in `Builder::<W>::append_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Vec<u8>: Seek` is not satisfied
[INFO] [stdout]    --> src/async_channel.rs:136:14
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer()
[INFO] [stdout]     |              ^^^^^^^^^^^^^ the trait `Seek` is not implemented for `Vec<u8>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: required for `&mut Vec<u8>` to implement `Seek`
[INFO] [stdout] note: required by a bound in `tar::Builder::<W>::append_writer`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tar-0.4.43/src/builder.rs:222:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn append_writer<'a, P: AsRef<Path>>(
[INFO] [stdout]     |            ------------- required by a bound in this associated function
[INFO] [stdout] ...
[INFO] [stdout] 222 |         W: Seek,
[INFO] [stdout]     |            ^^^^ required by this bound in `Builder::<W>::append_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0061]: this method takes 2 arguments but 0 arguments were supplied
[INFO] [stdout]    --> src/async_channel.rs:136:14
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer()
[INFO] [stdout]     |              ^^^^^^^^^^^^^-- two arguments are missing
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tar-0.4.43/src/builder.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn append_writer<'a, P: AsRef<Path>>(
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] help: provide the arguments
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer(/* &mut tar::Header */, /* path */)
[INFO] [stdout]     |                            ++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0061]: this method takes 2 arguments but 0 arguments were supplied
[INFO] [stdout]    --> src/async_channel.rs:136:14
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer()
[INFO] [stdout]     |              ^^^^^^^^^^^^^-- two arguments are missing
[INFO] [stdout]     |
[INFO] [stdout] note: method defined here
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/tar-0.4.43/src/builder.rs:216:12
[INFO] [stdout]     |
[INFO] [stdout] 216 |     pub fn append_writer<'a, P: AsRef<Path>>(
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] help: provide the arguments
[INFO] [stdout]     |
[INFO] [stdout] 136 |             .append_writer(/* &mut tar::Header */, /* path */)
[INFO] [stdout]     |                            ++++++++++++++++++++++++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `async_channel::Receiver<u8>: AsyncBufRead` is not satisfied
[INFO] [stdout]    --> src/async_channel.rs:159:46
[INFO] [stdout]     |
[INFO] [stdout] 159 |     let bz_encoder = BzEncoder::with_quality(compress_rx, Level::Best);
[INFO] [stdout]     |                      ----------------------- ^^^^^^^^^^^ the trait `AsyncBufRead` is not implemented for `async_channel::Receiver<u8>`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout]     = help: the following other types implement trait `AsyncBufRead`:
[INFO] [stdout]               &[u8]
[INFO] [stdout]               &mut T
[INFO] [stdout]               Box<T>
[INFO] [stdout]               BufStream<RW>
[INFO] [stdout]               Pin<P>
[INFO] [stdout]               async_compression::tokio::write::BzDecoder<W>
[INFO] [stdout]               async_compression::tokio::write::BzEncoder<W>
[INFO] [stdout]               std::io::Cursor<T>
[INFO] [stdout]             and 10 others
[INFO] [stdout] note: required by a bound in `async_compression::tokio::bufread::BzEncoder::<R>::with_quality`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/async-compression-0.4.18/src/tokio/bufread/mod.rs:10:1
[INFO] [stdout]     |
[INFO] [stdout] 10  | algos!(tokio::bufread<R>);
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound in this associated function
[INFO] [stdout]     | required by this bound in `BzEncoder::<R>::with_quality`
[INFO] [stdout]     = note: this error originates in the macro `encoder` which comes from the expansion of the macro `algos` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `async_channel::Receiver<u8>: AsyncBufRead` is not satisfied
[INFO] [stdout]    --> src/async_channel.rs:159:46
[INFO] [stdout]     |
[INFO] [stdout] 159 |     let bz_encoder = BzEncoder::with_quality(compress_rx, Level::Best);
[INFO] [stdout]     |                      ----------------------- ^^^^^^^^^^^ the trait `AsyncBufRead` is not implemented for `async_channel::Receiver<u8>`
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout]     = help: the following other types implement trait `AsyncBufRead`:
[INFO] [stdout]               &[u8]
[INFO] [stdout]               &mut T
[INFO] [stdout]               Box<T>
[INFO] [stdout]               BufStream<RW>
[INFO] [stdout]               Pin<P>
[INFO] [stdout]               async_compression::tokio::write::BzDecoder<W>
[INFO] [stdout]               async_compression::tokio::write::BzEncoder<W>
[INFO] [stdout]               std::io::Cursor<T>
[INFO] [stdout]             and 10 others
[INFO] [stdout] note: required by a bound in `async_compression::tokio::bufread::BzEncoder::<R>::with_quality`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/async-compression-0.4.18/src/tokio/bufread/mod.rs:10:1
[INFO] [stdout]     |
[INFO] [stdout] 10  | algos!(tokio::bufread<R>);
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound in this associated function
[INFO] [stdout]     | required by this bound in `BzEncoder::<R>::with_quality`
[INFO] [stdout]     = note: this error originates in the macro `encoder` which comes from the expansion of the macro `algos` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/functions.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let result = loop {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let s = "hello";
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let s = String::from("hello");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/ownership.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let y = x; // Copy
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/ownership.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 |         let x = String::from("world");
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/ownership.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let x = "hello";
[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]  --> src/ownership.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let y = 22;
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/references.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/slices.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let hello = &s[..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/slices.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let world = &s[6..];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello_world`
[INFO] [stdout]   --> src/slices.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let hello_world = &s[..];
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hello_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/slices.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut s = String::from("hello world");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/slices.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let word = first_word(&s2);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/slices.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let slice = &a[..2];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/slices.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut s = String::from("hello world");
[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/slices.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut s = String::from("hello world");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/variables.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let a = 99_222;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/variables.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let b = 0xff;
[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/variables.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let c = 0o77;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/variables.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let d = 0b1111_0000;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/variables.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let e = b'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let f: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let f = 2.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/variables.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let g: f32 = 3.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/variables.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/variables.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let difference = 95.5 - 4.3;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/variables.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let product = 4 * 30;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/variables.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let quotient = 56.7 / 32.2;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reminder`
[INFO] [stdout]   --> src/variables.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let reminder = 43 % 5;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reminder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]   --> src/functions.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let result = loop {
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/variables.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let t = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let f = false;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/variables.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     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: `heart_eyed_cat`
[INFO] [stdout]   --> src/variables.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let heart_eyed_cat = '😻';
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/variables.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (name, count) = tup;
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> src/variables.rs:33:16
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (name, count) = tup;
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> src/variables.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let count = tup.1;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `not_found`
[INFO] [stdout]   --> src/variables.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let not_found = error_codes[1];
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_not_found`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/variables.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let byte = [0; 8];
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let s = "hello";
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/ownership.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |         let s = String::from("hello");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/ownership.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let y = x; // Copy
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/ownership.rs:3:13
[INFO] [stdout]   |
[INFO] [stdout] 3 |         let x = String::from("world");
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]  --> src/ownership.rs:7:13
[INFO] [stdout]   |
[INFO] [stdout] 7 |         let x = "hello";
[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]  --> src/ownership.rs:8:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |         let y = 22;
[INFO] [stdout]   |             ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `r1`
[INFO] [stdout]   --> src/references.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let r1 = &mut s;
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello`
[INFO] [stdout]   --> src/slices.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let hello = &s[..5];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_hello`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `world`
[INFO] [stdout]   --> src/slices.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let world = &s[6..];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `hello_world`
[INFO] [stdout]   --> src/slices.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let hello_world = &s[..];
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_hello_world`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/slices.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut s = String::from("hello world");
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/slices.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let word = first_word(&s2);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `slice`
[INFO] [stdout]   --> src/slices.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let slice = &a[..2];
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_slice`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/slices.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut s = String::from("hello world");
[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/slices.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let mut s = String::from("hello world");
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]  --> src/variables.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let a = 99_222;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/variables.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let b = 0xff;
[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/variables.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let c = 0o77;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `d`
[INFO] [stdout]   --> src/variables.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let d = 0b1111_0000;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_d`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `e`
[INFO] [stdout]   --> src/variables.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let e = b'A';
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_e`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let f: u8 = 255;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let f = 2.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `g`
[INFO] [stdout]   --> src/variables.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let g: f32 = 3.0;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_g`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `sum`
[INFO] [stdout]   --> src/variables.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let sum = 5 + 10;
[INFO] [stdout]    |         ^^^ help: if this is intentional, prefix it with an underscore: `_sum`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `difference`
[INFO] [stdout]   --> src/variables.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |     let difference = 95.5 - 4.3;
[INFO] [stdout]    |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_difference`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `product`
[INFO] [stdout]   --> src/variables.rs:22:9
[INFO] [stdout]    |
[INFO] [stdout] 22 |     let product = 4 * 30;
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_product`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotient`
[INFO] [stdout]   --> src/variables.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let quotient = 56.7 / 32.2;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotient`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `reminder`
[INFO] [stdout]   --> src/variables.rs:24:9
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let reminder = 43 % 5;
[INFO] [stdout]    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reminder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/variables.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |     let t = true;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]   --> src/variables.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let f = false;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]   --> src/variables.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     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: `heart_eyed_cat`
[INFO] [stdout]   --> src/variables.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let heart_eyed_cat = '😻';
[INFO] [stdout]    |         ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heart_eyed_cat`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/variables.rs:33:10
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (name, count) = tup;
[INFO] [stdout]    |          ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> src/variables.rs:33:16
[INFO] [stdout]    |
[INFO] [stdout] 33 |     let (name, count) = tup;
[INFO] [stdout]    |                ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `count`
[INFO] [stdout]   --> src/variables.rs:34:9
[INFO] [stdout]    |
[INFO] [stdout] 34 |     let count = tup.1;
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_count`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `not_found`
[INFO] [stdout]   --> src/variables.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     let not_found = error_codes[1];
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_not_found`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `byte`
[INFO] [stdout]   --> src/variables.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let byte = [0; 8];
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_byte`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0061, E0277.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0061`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-training` (bin "rust-training") due to 3 previous errors; 38 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] Some errors have detailed explanations: E0061, E0277.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0061`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-training` (bin "rust-training" test) due to 3 previous errors; 38 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "6b60bf629bf66d077b615266f54c986a821a1427ad31d3809c1205fa2f6110a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6b60bf629bf66d077b615266f54c986a821a1427ad31d3809c1205fa2f6110a3", kill_on_drop: false }`
[INFO] [stdout] 6b60bf629bf66d077b615266f54c986a821a1427ad31d3809c1205fa2f6110a3
