[INFO] cloning repository https://github.com/zhangrxiang/hello-rust [INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zhangrxiang/hello-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangrxiang%2Fhello-rust"` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangrxiang%2Fhello-rust'... [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 173f65658af8c7c372199d5839bf910f7cd297fa [INFO] checking zhangrxiang/hello-rust against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393 [INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzhangrxiang%2Fhello-rust" "/workspace/builds/worker-11/source"` [INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/zhangrxiang/hello-rust on toolchain 45d050cde277b22a755847338f2acc2c7b834141 [INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started tweaking git repo https://github.com/zhangrxiang/hello-rust [INFO] removed 0 missing examples [INFO] finished tweaking git repo https://github.com/zhangrxiang/hello-rust [INFO] tweaked toml for git repo https://github.com/zhangrxiang/hello-rust written to /workspace/builds/worker-11/source/Cargo.toml [INFO] crate git repo https://github.com/zhangrxiang/hello-rust already has a lockfile, it will not be regenerated [INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "check" "--frozen" "--all" "--all-targets"` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 76983865f92f2bbd4e585140234fc74fb299026df98618347257302f2608fab7 [INFO] running `"docker" "start" "-a" "76983865f92f2bbd4e585140234fc74fb299026df98618347257302f2608fab7"` [INFO] [stderr] Compiling autocfg v1.0.0 [INFO] [stderr] Compiling cc v1.0.47 [INFO] [stderr] Compiling bitflags v1.2.1 [INFO] [stderr] Checking unicode-width v0.1.6 [INFO] [stderr] Checking rustc-demangle v0.1.16 [INFO] [stderr] Checking cfg-if v0.1.10 [INFO] [stderr] Checking strsim v0.8.0 [INFO] [stderr] Checking rand v0.4.6 [INFO] [stderr] Checking atty v0.2.13 [INFO] [stderr] Checking textwrap v0.11.0 [INFO] [stderr] Compiling num-traits v0.2.11 [INFO] [stderr] Compiling num-integer v0.1.42 [INFO] [stderr] Checking clap v2.33.0 [INFO] [stderr] Checking rand v0.3.23 [INFO] [stderr] Checking rust-crypto v0.2.36 [INFO] [stderr] Compiling backtrace-sys v0.1.32 [INFO] [stderr] Checking backtrace v0.3.40 [INFO] [stderr] Checking chrono v0.4.11 [INFO] [stderr] Checking error-chain v0.10.0 [INFO] [stderr] Checking ferris-says v0.1.1 [INFO] [stderr] Checking hello-rust v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] warning: unused doc comment [INFO] [stderr] --> src/lib/rand.rs:8:9 [INFO] [stderr] | [INFO] [stderr] 8 | / /** [INFO] [stderr] 9 | | ThreadRng { [INFO] [stderr] 10 | | rng: RefCell { [INFO] [stderr] 11 | | value: ReseedingRng { [INFO] [stderr] ... | [INFO] [stderr] 20 | | } [INFO] [stderr] 21 | | */ [INFO] [stderr] | |__________^ rustdoc does not generate documentation for macros [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_doc_comments)]` on by default [INFO] [stderr] = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion [INFO] [stderr] [INFO] [stderr] warning: multiple patterns covering the same range [INFO] [stderr] --> src/learn/match_test.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 14 | 13...39 => println!("A teen"), [INFO] [stderr] | ------- this range overlaps on `39u8` [INFO] [stderr] 15 | 39..=90 => println!("B teen"), [INFO] [stderr] | ^^^^^^^ overlapping patterns [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(overlapping_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/test/lifetime.rs:279:17 [INFO] [stderr] | [INFO] [stderr] 279 | let s: &'static str = "hello world"; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/test/lifetime.rs:283:23 [INFO] [stderr] | [INFO] [stderr] 283 | fn generic(x: T) [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/test/conversion.rs:48:13 [INFO] [stderr] | [INFO] [stderr] 48 | let mut contents = fs::read_to_string(&file_name)?; [INFO] [stderr] | ----^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: 4 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: multiple patterns covering the same range [INFO] [stderr] --> src/learn/match_test.rs:15:9 [INFO] [stderr] | [INFO] [stderr] 14 | 13...39 => println!("A teen"), [INFO] [stderr] | ------- this range overlaps on `39u8` [INFO] [stderr] 15 | 39..=90 => println!("B teen"), [INFO] [stderr] | ^^^^^^^ overlapping patterns [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(overlapping_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unreachable pattern [INFO] [stderr] --> src/test/match_test.rs:102:9 [INFO] [stderr] | [INFO] [stderr] 101 | a => println!("{}", a), [INFO] [stderr] | - matches any value [INFO] [stderr] 102 | ref a => println!("{}", a), [INFO] [stderr] | ^^^^^ unreachable pattern [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unreachable_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unreachable pattern [INFO] [stderr] --> src/test/match_test.rs:103:9 [INFO] [stderr] | [INFO] [stderr] 101 | a => println!("{}", a), [INFO] [stderr] | - matches any value [INFO] [stderr] 102 | ref a => println!("{}", a), [INFO] [stderr] 103 | ref mut m => { [INFO] [stderr] | ^^^^^^^^^ unreachable pattern [INFO] [stderr] [INFO] [stderr] warning: unused variable: `result` [INFO] [stderr] --> src/learn/net2.rs:35:17 [INFO] [stderr] | [INFO] [stderr] 35 | let result = match stream.read(&mut buf2) { [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_variables)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused variable: `err` [INFO] [stderr] --> src/learn/net2.rs:40:21 [INFO] [stderr] | [INFO] [stderr] 40 | Err(err) => { [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_err` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `larger` [INFO] [stderr] --> src/learn/test.rs:26:13 [INFO] [stderr] | [INFO] [stderr] 26 | let larger = Rectangle { width: 8, height: 7 }; [INFO] [stderr] | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_larger` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/learn/fs.rs:38:13 [INFO] [stderr] | [INFO] [stderr] 38 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:44:13 [INFO] [stderr] | [INFO] [stderr] 44 | let file = OpenOptions::new().read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `perms` [INFO] [stderr] --> src/learn/fs.rs:118:13 [INFO] [stderr] | [INFO] [stderr] 118 | let mut perms = file.metadata()?.permissions(); [INFO] [stderr] | ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_perms` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `attr` [INFO] [stderr] --> src/learn/fs.rs:364:13 [INFO] [stderr] | [INFO] [stderr] 364 | let attr = fs::metadata("/some/file/path.txt")?; [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_attr` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `attr` [INFO] [stderr] --> src/learn/fs.rs:371:13 [INFO] [stderr] | [INFO] [stderr] 371 | let attr = fs::symlink_metadata("symlink.txt")?; [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_attr` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:131:17 [INFO] [stderr] | [INFO] [stderr] 131 | let file = options.read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:136:17 [INFO] [stderr] | [INFO] [stderr] 136 | let file = OpenOptions::new().read(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:141:17 [INFO] [stderr] | [INFO] [stderr] 141 | let file = OpenOptions::new().write(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:146:17 [INFO] [stderr] | [INFO] [stderr] 146 | let file = OpenOptions::new().append(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:151:17 [INFO] [stderr] | [INFO] [stderr] 151 | let file = OpenOptions::new().truncate(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:156:17 [INFO] [stderr] | [INFO] [stderr] 156 | let file = OpenOptions::new().create(true).open("foo.txt"); [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `file` [INFO] [stderr] --> src/learn/fs.rs:161:17 [INFO] [stderr] | [INFO] [stderr] 161 | let file = OpenOptions::new() [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_file` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s2` [INFO] [stderr] --> src/learn/macros.rs:198:13 [INFO] [stderr] | [INFO] [stderr] 198 | let s2 = format_args!("hello {}", "world"); [INFO] [stderr] | ^^ help: if this is intentional, prefix it with an underscore: `_s2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `buffer2` [INFO] [stderr] --> src/learn/io.rs:28:13 [INFO] [stderr] | [INFO] [stderr] 28 | let mut buffer2 = String::from("hello world"); [INFO] [stderr] | ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_buffer2` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `local_dt` [INFO] [stderr] --> src/lib/chrono.rs:36:13 [INFO] [stderr] | [INFO] [stderr] 36 | let local_dt = Local.ymd(2014, 7, 8).and_hms_milli(9, 10, 11, 12); [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_local_dt` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/lib/fs/file.rs:12:16 [INFO] [stderr] | [INFO] [stderr] 12 | Ok(f) => { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/lib/fs/file.rs:24:24 [INFO] [stderr] | [INFO] [stderr] 24 | Ok(f) => println!("创建文件成功"), [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `f` [INFO] [stderr] --> src/lib/fs/file.rs:34:19 [INFO] [stderr] | [INFO] [stderr] 34 | if let Ok(f) = result { [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_f` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `buf` [INFO] [stderr] --> src/lib/fs/read_dir.rs:75:25 [INFO] [stderr] | [INFO] [stderr] 75 | let buf = e.path(); [INFO] [stderr] | ^^^ help: if this is intentional, prefix it with an underscore: `_buf` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `ref_to_x` [INFO] [stderr] --> src/test/custom_types.rs:42:20 [INFO] [stderr] | [INFO] [stderr] 42 | let Point { x: ref_to_x, y: a } = point; [INFO] [stderr] | ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ref_to_x` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `a` [INFO] [stderr] --> src/test/custom_types.rs:42:33 [INFO] [stderr] | [INFO] [stderr] 42 | let Point { x: ref_to_x, y: a } = point; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_a` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `Work` [INFO] [stderr] --> src/test/custom_types.rs:149:13 [INFO] [stderr] | [INFO] [stderr] 149 | Work => println!("soldiers fight"), [INFO] [stderr] | ^^^^ help: if this is intentional, prefix it with an underscore: `_Work` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `s` [INFO] [stderr] --> src/test/lifetime.rs:279:17 [INFO] [stderr] | [INFO] [stderr] 279 | let s: &'static str = "hello world"; [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_s` [INFO] [stderr] [INFO] [stderr] warning: unused variable: `x` [INFO] [stderr] --> src/test/lifetime.rs:283:23 [INFO] [stderr] | [INFO] [stderr] 283 | fn generic(x: T) [INFO] [stderr] | ^ help: if this is intentional, prefix it with an underscore: `_x` [INFO] [stderr] [INFO] [stderr] warning: variable `inferred_type` is assigned to, but never used [INFO] [stderr] --> src/test/primitives.rs:14:9 [INFO] [stderr] | [INFO] [stderr] 14 | let mut inferred_type = 12; // Type i64 is inferred from another line [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: consider using `_inferred_type` instead [INFO] [stderr] [INFO] [stderr] warning: value assigned to `inferred_type` is never read [INFO] [stderr] --> src/test/primitives.rs:15:5 [INFO] [stderr] | [INFO] [stderr] 15 | inferred_type = 4294967296i64; [INFO] [stderr] | ^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_assignments)]` on by default [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: variable `mutable` is assigned to, but never used [INFO] [stderr] --> src/test/primitives.rs:18:9 [INFO] [stderr] | [INFO] [stderr] 18 | let mut mutable = 12; // Mutable `i32` [INFO] [stderr] | ^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: consider using `_mutable` instead [INFO] [stderr] [INFO] [stderr] warning: value assigned to `mutable` is never read [INFO] [stderr] --> src/test/primitives.rs:19:5 [INFO] [stderr] | [INFO] [stderr] 19 | mutable = 21; [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: maybe it is overwritten before being read? [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/net2.rs:11:13 [INFO] [stderr] | [INFO] [stderr] 11 | let mut sparkle_heart = vec![70]; [INFO] [stderr] | ----^^^^^^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/net2.rs:31:21 [INFO] [stderr] | [INFO] [stderr] 31 | let mut buf = [66, 67, 68, 69, 70]; [INFO] [stderr] | ----^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:38:13 [INFO] [stderr] | [INFO] [stderr] 38 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:84:13 [INFO] [stderr] | [INFO] [stderr] 84 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:91:13 [INFO] [stderr] | [INFO] [stderr] 91 | let mut f = File::open("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:108:13 [INFO] [stderr] | [INFO] [stderr] 108 | let mut file = File::open("foo.txt")?; [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:118:13 [INFO] [stderr] | [INFO] [stderr] 118 | let mut perms = file.metadata()?.permissions(); [INFO] [stderr] | ----^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/fs.rs:246:17 [INFO] [stderr] | [INFO] [stderr] 246 | let mut f = File::create("foo.txt")?; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/learn/io.rs:28:13 [INFO] [stderr] | [INFO] [stderr] 28 | let mut buffer2 = String::from("hello world"); [INFO] [stderr] | ----^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib/box_test.rs:41:13 [INFO] [stderr] | [INFO] [stderr] 41 | let mut x = Box::from([1_u8, 2, 3]); [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib/fs/read_dir.rs:51:19 [INFO] [stderr] | [INFO] [stderr] 51 | if let Ok(mut dir) = fs::read_dir(".") { [INFO] [stderr] | ----^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib/rand.rs:6:13 [INFO] [stderr] | [INFO] [stderr] 6 | let mut rng = rand::thread_rng(); [INFO] [stderr] | ----^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/lib/slice.rs:34:13 [INFO] [stderr] | [INFO] [stderr] 34 | let mut z = &[0, 1, 2]; [INFO] [stderr] | ----^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/test/conversion.rs:48:13 [INFO] [stderr] | [INFO] [stderr] 48 | let mut contents = fs::read_to_string(&file_name)?; [INFO] [stderr] | ----^^^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/test/fn_test.rs:27:17 [INFO] [stderr] | [INFO] [stderr] 27 | let mut name = "zing"; [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: unused attribute [INFO] [stderr] --> src/learn/net2.rs:30:13 [INFO] [stderr] | [INFO] [stderr] 30 | #[derive(Debug)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_attributes)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused attribute [INFO] [stderr] --> src/learn/net2.rs:32:13 [INFO] [stderr] | [INFO] [stderr] 32 | #[derive(Debug)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:26:9 [INFO] [stderr] | [INFO] [stderr] 26 | stream.set_read_timeout(Some(Duration::new(0, 0))); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_must_use)]` on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:27:9 [INFO] [stderr] | [INFO] [stderr] 27 | stream.set_write_timeout(Some(Duration::new(0, 0))); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/net2.rs:34:13 [INFO] [stderr] | [INFO] [stderr] 34 | stream.write(&buf); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/fs.rs:357:9 [INFO] [stderr] | [INFO] [stderr] 357 | fs::write("a.txt", "test"); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:125:9 [INFO] [stderr] | [INFO] [stderr] 125 | write(); [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:129:9 [INFO] [stderr] | [INFO] [stderr] 129 | write!(&mut s, "{} {}", "abc", 123); // uses fmt::Write::write_fmt [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:130:9 [INFO] [stderr] | [INFO] [stderr] 130 | write!(&mut v, "s = {:?}", s); // uses io::Write::write_fmt [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info) [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:156:9 [INFO] [stderr] | [INFO] [stderr] 156 | main(); [INFO] [stderr] | ^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/learn/macros.rs:166:9 [INFO] [stderr] | [INFO] [stderr] 166 | main2(); [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/lib/fs/dir_entry.rs:36:9 [INFO] [stderr] | [INFO] [stderr] 36 | / read_dir(".")? [INFO] [stderr] 37 | | .map(|res| res.map(|entry| println!("{:?}", { entry.file_name() }))) [INFO] [stderr] 38 | | .collect::>(); [INFO] [stderr] | |_____________________________________________________________^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used [INFO] [stderr] --> src/lib/fs/dir_entry.rs:36:9 [INFO] [stderr] | [INFO] [stderr] 36 | / read_dir(".")? [INFO] [stderr] 37 | | .map(|res| res.map(|entry| println!("{:?}", { entry.file_name() }))) [INFO] [stderr] 38 | | .collect::>(); [INFO] [stderr] | |_____________________________________________________________^ [INFO] [stderr] | [INFO] [stderr] = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/lib/fs/open_options.rs:28:17 [INFO] [stderr] | [INFO] [stderr] 28 | f.seek(SeekFrom::Start(0)); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] warning: variable `Work` should have a snake case name [INFO] [stderr] --> src/test/custom_types.rs:149:13 [INFO] [stderr] | [INFO] [stderr] 149 | Work => println!("soldiers fight"), [INFO] [stderr] | ^^^^ help: convert the identifier to snake case (notice the capitalization): `work` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: 65 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 27.19s [INFO] running `"docker" "inspect" "76983865f92f2bbd4e585140234fc74fb299026df98618347257302f2608fab7"` [INFO] running `"docker" "rm" "-f" "76983865f92f2bbd4e585140234fc74fb299026df98618347257302f2608fab7"` [INFO] [stdout] 76983865f92f2bbd4e585140234fc74fb299026df98618347257302f2608fab7