[INFO] cloning repository https://github.com/YumcoderCom/yum-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/YumcoderCom/yum-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYumcoderCom%2Fyum-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYumcoderCom%2Fyum-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 607354affc6a79d3472035c0fc92c2781e2a8b1d
[INFO] checking YumcoderCom/yum-rust against master#e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682 for beta-170-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FYumcoderCom%2Fyum-rust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/YumcoderCom/yum-rust on toolchain e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/YumcoderCom/yum-rust
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/YumcoderCom/yum-rust
[INFO] tweaked toml for git repo https://github.com/YumcoderCom/yum-rust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/YumcoderCom/yum-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" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f247e60bf77a7467f0e3fb1f9393f3af914172d35fc3f5fd64c27eea09b2e58
[INFO] running `Command { std: "docker" "start" "-a" "8f247e60bf77a7467f0e3fb1f9393f3af914172d35fc3f5fd64c27eea09b2e58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f247e60bf77a7467f0e3fb1f9393f3af914172d35fc3f5fd64c27eea09b2e58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f247e60bf77a7467f0e3fb1f9393f3af914172d35fc3f5fd64c27eea09b2e58", kill_on_drop: false }`
[INFO] [stdout] 8f247e60bf77a7467f0e3fb1f9393f3af914172d35fc3f5fd64c27eea09b2e58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+e6e4f7ed1589e03bc2f6c5931c1a72e7947e8682" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0d0ac5b1279637343ce138863dca34dc555fa7a2f784075d8f712874c880f8de
[INFO] running `Command { std: "docker" "start" "-a" "0d0ac5b1279637343ce138863dca34dc555fa7a2f784075d8f712874c880f8de", kill_on_drop: false }`
[INFO] [stderr] warning: rust-idioms v0.1.0 (/opt/rustwide/workdir) ignoring invalid dependency `trust-dns` which is missing a lib target
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[INFO] [stderr]    Compiling encoding_rs v0.8.28
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[INFO] [stderr]     Checking image v0.23.14
[INFO] [stderr]     Checking gfx_device_gl v0.16.2
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling tokio-macros v1.4.1
[INFO] [stderr]    Compiling async-stream-impl v0.3.2
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[INFO] [stderr]     Checking wayland-egl v0.28.6
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[INFO] [stderr]     Checking serde v1.0.130
[INFO] [stderr]     Checking tokio-util v0.6.8
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[INFO] [stderr]     Checking h2 v0.3.6
[INFO] [stderr]     Checking smithay-client-toolkit v0.12.3
[INFO] [stderr]     Checking winit v0.24.0
[INFO] [stderr]     Checking pistoncore-input v1.0.0
[INFO] [stderr]     Checking bstr v0.2.17
[INFO] [stderr]     Checking serde_cbor v0.11.2
[INFO] [stderr]     Checking serde_urlencoded v0.7.0
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking csv v1.1.6
[INFO] [stderr]     Checking hyper v0.14.13
[INFO] [stderr]     Checking glutin v0.26.0
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking pistoncore-window v0.47.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.53.0
[INFO] [stderr]     Checking criterion v0.3.5
[INFO] [stderr]     Checking piston v0.53.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.69.0
[INFO] [stderr]     Checking piston_window v0.120.0
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.5
[INFO] [stderr]     Checking rust-idioms v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: couldn't read src/design_pattern/behavioral/command_bench.rs: No such file or directory (os error 2)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common::error::Error`
[INFO] [stdout]  --> examples/yum_tokio/common/error.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     use crate::common::error::Error;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `core::fmt`
[INFO] [stdout]   --> examples/yum_tokio/common/error.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     use core::fmt;
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-idioms` (bench "command_bench") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `trust_dns`
[INFO] [stdout]  --> examples/cdn_resolve.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use trust_dns::serialize::binary::*;
[INFO] [stdout]   |     ^^^^^^^^^ use of undeclared crate or module `trust_dns`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `trust_dns`
[INFO] [stdout]  --> examples/cdn_resolve.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use trust_dns::rr::record_type::RecordType;
[INFO] [stdout]   |     ^^^^^^^^^ use of undeclared crate or module `trust_dns`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `trust_dns`
[INFO] [stdout]  --> examples/cdn_resolve.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use trust_dns::{
[INFO] [stdout]   |     ^^^^^^^^^ use of undeclared crate or module `trust_dns`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved imports `trust_dns::rr::record_type::RecordType`, `trust_dns::op::Message`, `trust_dns::op::MessageType`, `trust_dns::op::OpCode`, `trust_dns::op::Query`, `trust_dns::rr::domain::Name`
[INFO] [stdout]   --> examples/cdn_resolve.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout] 6  | use trust_dns::rr::record_type::RecordType;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 9  |     op::{Message, MessageType, OpCode, Query},
[INFO] [stdout]    |          ^^^^^^^  ^^^^^^^^^^^  ^^^^^^  ^^^^^
[INFO] [stdout] 10 |     rr::domain::Name,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] ^ "<-token->"
[INFO] [stdout] < "<-token->"
[INFO] [stdout] @ "<-token->"
[INFO] [stdout] < "<-token->"
[INFO] [stdout] ."<-token->"
[INFO] [stdout] @ "<-token->"
[INFO] [stdout] * "<-token->"
[INFO] [stdout] '\x08' "<-token->"
[INFO] [stdout] '{' "<-token->"
[INFO] [stdout] '"' "<-token->"
[INFO] [stdout] _ "<-token->"
[INFO] [stdout] # "<-token->"
[INFO] [stdout] ' ' "<-token->"
[INFO] [stdout] - "<-token->"
[INFO] [stdout] @ "<-token->"
[INFO] [stdout] '$' "<-token->"
[INFO] [stdout] && "<-token->"
[INFO] [stdout] / "<-token->"
[INFO] [stdout] _ "<-token->"
[INFO] [stdout] % "<-token->"
[INFO] [stdout] ! "<-token->"
[INFO] [stdout] ('\t' @ | = > ; '\x08' '\'' + '$' ? '\x7f', # '"' ~ |) "<-token->"
[INFO] [stdout] '\x07' "<-token->"
[INFO] [stdout] warning: variants `Incomplete` and `Other` are never constructed
[INFO] [stdout]  --> examples/yum_tokio/common/error.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | pub enum Error {
[INFO] [stdout]   |          ----- variants in this enum
[INFO] [stdout] 3 |     /// Not enough data is available to parse a message
[INFO] [stdout] 4 |     Incomplete,
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout] 5 |     Other(crate::Error),
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0603]: module `crc32` is private
[INFO] [stdout]   --> examples/yum_db/app.rs:8:10
[INFO] [stdout]    |
[INFO] [stdout] 8  | use crc::crc32;
[INFO] [stdout]    |          ^^^^^ private module
[INFO] [stdout]    |
[INFO] [stdout] note: the module `crc32` is defined here
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/crc-2.1.0/src/lib.rs:36:1
[INFO] [stdout]    |
[INFO] [stdout] 36 | mod crc32;
[INFO] [stdout]    | ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `stream`
[INFO] [stdout]   --> examples/std_tcp/app.rs:72:13
[INFO] [stdout]    |
[INFO] [stdout] 72 |         let stream = stream.unwrap();
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_stream`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reading_the_request` is never used
[INFO] [stdout]   --> examples/std_tcp/app.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn reading_the_request() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `building_a_single_threaded_server` is never used
[INFO] [stdout]   --> examples/std_tcp/app.rs:68:4
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn building_a_single_threaded_server() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `building_multi_thread_server` is never used
[INFO] [stdout]   --> examples/std_tcp/app.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn building_multi_thread_server() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `workers` is never read
[INFO] [stdout]    --> examples/std_tcp/app.rs:106:5
[INFO] [stdout]     |
[INFO] [stdout] 105 | pub struct ThreadPool {
[INFO] [stdout]     |            ---------- field in this struct
[INFO] [stdout] 106 |     workers: Vec<Worker>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> src/main.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `id` and `thread` are never read
[INFO] [stdout]    --> examples/std_tcp/app.rs:153:5
[INFO] [stdout]     |
[INFO] [stdout] 152 | struct Worker {
[INFO] [stdout]     |        ------ fields in this struct
[INFO] [stdout] 153 |     id: usize,
[INFO] [stdout]     |     ^^
[INFO] [stdout] 154 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]     |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::time::Duration`
[INFO] [stdout]  --> src/concurrency/time.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::time::Duration;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Instant`, `sleep`
[INFO] [stdout]  --> src/concurrency/time.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 |     use tokio::time::{sleep, Instant};
[INFO] [stdout]   |                       ^^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Ordering`
[INFO] [stdout]  --> src/rust_lang/cmp.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::cmp::Ordering;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/rust_lang/return_type.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     use std::fmt::Debug;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `sum` is assigned to, but never used
[INFO] [stdout]   --> src/rust_lang/flow_control_bench.rs:28:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let mut sum = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_sum` instead
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `sum` is assigned to, but never used
[INFO] [stdout]   --> src/rust_lang/flow_control_bench.rs:46:13
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut sum = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: consider using `_sum` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0603`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-idioms` (example "yum_db") due to 2 previous errors
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `BinEncoder`
[INFO] [stdout]   --> examples/cdn_resolve.rs:46:23
[INFO] [stdout]    |
[INFO] [stdout] 46 |     let mut encoder = BinEncoder::new(&mut request_as_bytes);
[INFO] [stdout]    |                       ^^^^^^^^^^ use of undeclared type `BinEncoder`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-idioms` (example "cdn_resolve") due to 6 previous errors
[INFO] [stdout] warning: static `ERROR` is never used
[INFO] [stdout]  --> src/rust_lang/modifying_static.rs:7:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | static mut ERROR: i32 = 0;
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/design_pattern/builder.rs:24:21
[INFO] [stdout]    |
[INFO] [stdout] 24 |                 let mut new = self;
[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/memory_safety/move_copy_clone.rs:151:13
[INFO] [stdout]     |
[INFO] [stdout] 151 |         let mut v1 = v.clone(); // ok since Vec implements Clone
[INFO] [stdout]     |             ----^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c_book`
[INFO] [stdout]   --> src/rust_lang/cmp.rs:61:13
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let c_book = Book {
[INFO] [stdout]    |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_c_book`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `strFrom`
[INFO] [stdout]   --> src/use_borrowed_args/str_string.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let strFrom =  String::from("hello world");
[INFO] [stdout]    |             ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_strFrom`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/use_borrowed_args/str_string.rs:75:13
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut from_str_name = String::from_str("Yumcoder").unwrap();
[INFO] [stdout]    |             ----^^^^^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ipsum` is never read
[INFO] [stdout]   --> src/design_pattern/builder.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         struct Lorem {
[INFO] [stdout]    |                ----- field in this struct
[INFO] [stdout] 14 |             ipsum: u32,
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Lorem` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `PaperBack` is never constructed
[INFO] [stdout]   --> src/rust_lang/cmp.rs:22:13
[INFO] [stdout]    |
[INFO] [stdout] 20 |         enum BookFormat {
[INFO] [stdout]    |              ---------- variant in this enum
[INFO] [stdout] 21 |             HardBack,
[INFO] [stdout] 22 |             PaperBack,
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.clone()` on a double reference, which returns `&str` instead of cloning the inner type
[INFO] [stdout]   --> src/rust_lang/option.rs:38:30
[INFO] [stdout]    |
[INFO] [stdout] 38 |             res.push(logician.clone());
[INFO] [stdout]    |                              ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `strFrom` should have a snake case name
[INFO] [stdout]   --> src/use_borrowed_args/str_string.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |         let strFrom =  String::from("hello world");
[INFO] [stdout]    |             ^^^^^^^ help: convert the identifier to snake case: `str_from`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "0d0ac5b1279637343ce138863dca34dc555fa7a2f784075d8f712874c880f8de", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d0ac5b1279637343ce138863dca34dc555fa7a2f784075d8f712874c880f8de", kill_on_drop: false }`
[INFO] [stdout] 0d0ac5b1279637343ce138863dca34dc555fa7a2f784075d8f712874c880f8de
