[INFO] updating cached repository iyuroch/rust_shell
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/iyuroch/rust_shell
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/iyuroch/rust_shell" "work/ex/clippy-test-run/sources/stable/gh/iyuroch/rust_shell"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/iyuroch/rust_shell'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/iyuroch/rust_shell" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iyuroch/rust_shell"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iyuroch/rust_shell'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4ed492acbc57081a799b256b9f4cf90efcdd1206
[INFO] sha for GitHub repo iyuroch/rust_shell: 4ed492acbc57081a799b256b9f4cf90efcdd1206
[INFO] validating manifest of iyuroch/rust_shell on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of iyuroch/rust_shell on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing iyuroch/rust_shell
[INFO] finished frobbing iyuroch/rust_shell
[INFO] frobbed toml for iyuroch/rust_shell written to work/ex/clippy-test-run/sources/stable/gh/iyuroch/rust_shell/Cargo.toml
[INFO] started frobbing iyuroch/rust_shell
[INFO] finished frobbing iyuroch/rust_shell
[INFO] frobbed toml for iyuroch/rust_shell written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/iyuroch/rust_shell/Cargo.toml
[INFO] crate iyuroch/rust_shell has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting iyuroch/rust_shell against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-7/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/iyuroch/rust_shell:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] bd3264ad41e64ab3d65164934ccf159bf5ba346254551a1cf970bd88329a3997
[INFO] running `"docker" "start" "-a" "bd3264ad41e64ab3d65164934ccf159bf5ba346254551a1cf970bd88329a3997"`
[INFO] [stderr]     Checking rust_shell v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: immediately dereferencing a reference
[INFO] [stderr]   --> src/main.rs:29:17
[INFO] [stderr]    |
[INFO] [stderr] 29 |     match chdir(*&args[1].to_str().unwrap()) {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `args[1].to_str().unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::deref_addrof)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
[INFO] [stderr] 
[INFO] [stderr] warning: immediately dereferencing a reference
[INFO] [stderr]   --> src/main.rs:29:17
[INFO] [stderr]    |
[INFO] [stderr] 29 |     match chdir(*&args[1].to_str().unwrap()) {
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `args[1].to_str().unwrap()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::deref_addrof)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#deref_addrof
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/main.rs:39:44
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let cstr_argv: Vec<_> = str_argv.split(" ")
[INFO] [stderr]    |                                            ^^^ help: try using a char instead: `' '`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 | /     match exec_name.as_ref() {
[INFO] [stderr] 46 | |         "cd" => {
[INFO] [stderr] 47 | |             cd(cstr_argv);
[INFO] [stderr] 48 | |             return;
[INFO] [stderr] 49 | |         },
[INFO] [stderr] 50 | |         _ => {},
[INFO] [stderr] 51 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 |     if let "cd" = exec_name.as_ref() {
[INFO] [stderr] 46 |     cd(cstr_argv);
[INFO] [stderr] 47 |     return;
[INFO] [stderr] 48 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 | /             match parent_write_end {
[INFO] [stderr] 67 | |                 Some(v) => {
[INFO] [stderr] 68 | |                     match close(v) {
[INFO] [stderr] 69 | |                         Ok(_) => {},
[INFO] [stderr] ...  |
[INFO] [stderr] 73 | |                 None => {},
[INFO] [stderr] 74 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 66 |             if let Some(v) = parent_write_end {
[INFO] [stderr] 67 |     match close(v) {
[INFO] [stderr] 68 |         Ok(_) => {},
[INFO] [stderr] 69 |         Err(_e) => {},
[INFO] [stderr] 70 |     }
[INFO] [stderr] 71 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 76 | /             match read_end {
[INFO] [stderr] 77 | |                 Some(v) => {
[INFO] [stderr] 78 | |                     match close(v) {
[INFO] [stderr] 79 | |                         Ok(_) => {},
[INFO] [stderr] ...  |
[INFO] [stderr] 83 | |                 None => {},
[INFO] [stderr] 84 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 76 |             if let Some(v) = read_end {
[INFO] [stderr] 77 |     match close(v) {
[INFO] [stderr] 78 |         Ok(_) => {},
[INFO] [stderr] 79 |         Err(_e) => {},
[INFO] [stderr] 80 |     }
[INFO] [stderr] 81 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:86:13
[INFO] [stderr]    |
[INFO] [stderr] 86 | /             match last {
[INFO] [stderr] 87 | |                 Some(_) => match waitpid(child, Option::None) {
[INFO] [stderr] 88 | |                     Ok(_) => {
[INFO] [stderr] 89 | |                         return;
[INFO] [stderr] ...  |
[INFO] [stderr] 93 | |                 None => {},
[INFO] [stderr] 94 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 86 |             if let Some(_) = last { match waitpid(child, Option::None) {
[INFO] [stderr] 87 |     Ok(_) => {
[INFO] [stderr] 88 |         return;
[INFO] [stderr] 89 |     },
[INFO] [stderr] 90 |     Err(e) => println!("Error: {}", e)
[INFO] [stderr] 91 | } }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:103:13
[INFO] [stderr]     |
[INFO] [stderr] 103 | /             match parent_write_end {
[INFO] [stderr] 104 | |                 Some(v) => close(v).unwrap(),
[INFO] [stderr] 105 | |                 None => {},
[INFO] [stderr] 106 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(v) = parent_write_end { close(v).unwrap() }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:108:13
[INFO] [stderr]     |
[INFO] [stderr] 108 | /             match child_read_end {
[INFO] [stderr] 109 | |                 Some(v) => close(v).unwrap(),
[INFO] [stderr] 110 | |                 None => {},
[INFO] [stderr] 111 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(v) = child_read_end { close(v).unwrap() }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:113:13
[INFO] [stderr]     |
[INFO] [stderr] 113 | /             match read_end {
[INFO] [stderr] 114 | |                     Some(v) => {
[INFO] [stderr] 115 | |                         dup2(v, 0).unwrap();
[INFO] [stderr] 116 | |                     },
[INFO] [stderr] 117 | |                     None => {},
[INFO] [stderr] 118 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 113 |             if let Some(v) = read_end {
[INFO] [stderr] 114 |     dup2(v, 0).unwrap();
[INFO] [stderr] 115 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:120:13
[INFO] [stderr]     |
[INFO] [stderr] 120 | /             match write_end {
[INFO] [stderr] 121 | |                     Some(v) => {
[INFO] [stderr] 122 | |                         dup2(v, 1).unwrap();
[INFO] [stderr] 123 | |                     },
[INFO] [stderr] 124 | |                     None => {},
[INFO] [stderr] 125 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 120 |             if let Some(v) = write_end {
[INFO] [stderr] 121 |     dup2(v, 1).unwrap();
[INFO] [stderr] 122 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:133:21
[INFO] [stderr]     |
[INFO] [stderr] 133 | /                     match *first_child {
[INFO] [stderr] 134 | |                         Some(v) => {
[INFO] [stderr] 135 | |                             match kill(v, SIGKILL) {
[INFO] [stderr] 136 | |                                 Ok(_) => {},
[INFO] [stderr] ...   |
[INFO] [stderr] 142 | |                         None => {},
[INFO] [stderr] 143 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 133 |                     if let Some(v) = *first_child {
[INFO] [stderr] 134 |     match kill(v, SIGKILL) {
[INFO] [stderr] 135 |         Ok(_) => {},
[INFO] [stderr] 136 |         Err(e) => {
[INFO] [stderr] 137 |             println!("cannot kill pid {:?}", e);
[INFO] [stderr] 138 |         },
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: calling `as_bytes()` on a string literal
[INFO] [stderr]    --> src/main.rs:160:37
[INFO] [stderr]     |
[INFO] [stderr] 160 |     prompt_string.extend_from_slice(" > ".as_bytes());
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `b" > "`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::string_lit_as_bytes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/main.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 161 |     io::stdout().write(&prompt_string).expect("Cannot print");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/main.rs:191:20
[INFO] [stderr]     |
[INFO] [stderr] 191 |                 if pr_arr.len() == 0 {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `pr_arr.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:196:42
[INFO] [stderr]     |
[INFO] [stderr] 196 |                     fd_arr.extend(&[Some(write_end.clone()), Some(read_end.clone())]);
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `write_end`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:196:67
[INFO] [stderr]     |
[INFO] [stderr] 196 |                     fd_arr.extend(&[Some(write_end.clone()), Some(read_end.clone())]);
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `read_end`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust_shell`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/main.rs:39:44
[INFO] [stderr]    |
[INFO] [stderr] 39 |     let cstr_argv: Vec<_> = str_argv.split(" ")
[INFO] [stderr]    |                                            ^^^ help: try using a char instead: `' '`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_char_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 | /     match exec_name.as_ref() {
[INFO] [stderr] 46 | |         "cd" => {
[INFO] [stderr] 47 | |             cd(cstr_argv);
[INFO] [stderr] 48 | |             return;
[INFO] [stderr] 49 | |         },
[INFO] [stderr] 50 | |         _ => {},
[INFO] [stderr] 51 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 |     if let "cd" = exec_name.as_ref() {
[INFO] [stderr] 46 |     cd(cstr_argv);
[INFO] [stderr] 47 |     return;
[INFO] [stderr] 48 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:66:13
[INFO] [stderr]    |
[INFO] [stderr] 66 | /             match parent_write_end {
[INFO] [stderr] 67 | |                 Some(v) => {
[INFO] [stderr] 68 | |                     match close(v) {
[INFO] [stderr] 69 | |                         Ok(_) => {},
[INFO] [stderr] ...  |
[INFO] [stderr] 73 | |                 None => {},
[INFO] [stderr] 74 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 66 |             if let Some(v) = parent_write_end {
[INFO] [stderr] 67 |     match close(v) {
[INFO] [stderr] 68 |         Ok(_) => {},
[INFO] [stderr] 69 |         Err(_e) => {},
[INFO] [stderr] 70 |     }
[INFO] [stderr] 71 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:76:13
[INFO] [stderr]    |
[INFO] [stderr] 76 | /             match read_end {
[INFO] [stderr] 77 | |                 Some(v) => {
[INFO] [stderr] 78 | |                     match close(v) {
[INFO] [stderr] 79 | |                         Ok(_) => {},
[INFO] [stderr] ...  |
[INFO] [stderr] 83 | |                 None => {},
[INFO] [stderr] 84 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 76 |             if let Some(v) = read_end {
[INFO] [stderr] 77 |     match close(v) {
[INFO] [stderr] 78 |         Ok(_) => {},
[INFO] [stderr] 79 |         Err(_e) => {},
[INFO] [stderr] 80 |     }
[INFO] [stderr] 81 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/main.rs:86:13
[INFO] [stderr]    |
[INFO] [stderr] 86 | /             match last {
[INFO] [stderr] 87 | |                 Some(_) => match waitpid(child, Option::None) {
[INFO] [stderr] 88 | |                     Ok(_) => {
[INFO] [stderr] 89 | |                         return;
[INFO] [stderr] ...  |
[INFO] [stderr] 93 | |                 None => {},
[INFO] [stderr] 94 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 86 |             if let Some(_) = last { match waitpid(child, Option::None) {
[INFO] [stderr] 87 |     Ok(_) => {
[INFO] [stderr] 88 |         return;
[INFO] [stderr] 89 |     },
[INFO] [stderr] 90 |     Err(e) => println!("Error: {}", e)
[INFO] [stderr] 91 | } }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:103:13
[INFO] [stderr]     |
[INFO] [stderr] 103 | /             match parent_write_end {
[INFO] [stderr] 104 | |                 Some(v) => close(v).unwrap(),
[INFO] [stderr] 105 | |                 None => {},
[INFO] [stderr] 106 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(v) = parent_write_end { close(v).unwrap() }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:108:13
[INFO] [stderr]     |
[INFO] [stderr] 108 | /             match child_read_end {
[INFO] [stderr] 109 | |                 Some(v) => close(v).unwrap(),
[INFO] [stderr] 110 | |                 None => {},
[INFO] [stderr] 111 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(v) = child_read_end { close(v).unwrap() }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:113:13
[INFO] [stderr]     |
[INFO] [stderr] 113 | /             match read_end {
[INFO] [stderr] 114 | |                     Some(v) => {
[INFO] [stderr] 115 | |                         dup2(v, 0).unwrap();
[INFO] [stderr] 116 | |                     },
[INFO] [stderr] 117 | |                     None => {},
[INFO] [stderr] 118 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 113 |             if let Some(v) = read_end {
[INFO] [stderr] 114 |     dup2(v, 0).unwrap();
[INFO] [stderr] 115 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:120:13
[INFO] [stderr]     |
[INFO] [stderr] 120 | /             match write_end {
[INFO] [stderr] 121 | |                     Some(v) => {
[INFO] [stderr] 122 | |                         dup2(v, 1).unwrap();
[INFO] [stderr] 123 | |                     },
[INFO] [stderr] 124 | |                     None => {},
[INFO] [stderr] 125 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 120 |             if let Some(v) = write_end {
[INFO] [stderr] 121 |     dup2(v, 1).unwrap();
[INFO] [stderr] 122 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/main.rs:133:21
[INFO] [stderr]     |
[INFO] [stderr] 133 | /                     match *first_child {
[INFO] [stderr] 134 | |                         Some(v) => {
[INFO] [stderr] 135 | |                             match kill(v, SIGKILL) {
[INFO] [stderr] 136 | |                                 Ok(_) => {},
[INFO] [stderr] ...   |
[INFO] [stderr] 142 | |                         None => {},
[INFO] [stderr] 143 | |                     }
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 133 |                     if let Some(v) = *first_child {
[INFO] [stderr] 134 |     match kill(v, SIGKILL) {
[INFO] [stderr] 135 |         Ok(_) => {},
[INFO] [stderr] 136 |         Err(e) => {
[INFO] [stderr] 137 |             println!("cannot kill pid {:?}", e);
[INFO] [stderr] 138 |         },
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: calling `as_bytes()` on a string literal
[INFO] [stderr]    --> src/main.rs:160:37
[INFO] [stderr]     |
[INFO] [stderr] 160 |     prompt_string.extend_from_slice(" > ".as_bytes());
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^ help: consider using a byte string literal instead: `b" > "`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::string_lit_as_bytes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#string_lit_as_bytes
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/main.rs:161:5
[INFO] [stderr]     |
[INFO] [stderr] 161 |     io::stdout().write(&prompt_string).expect("Cannot print");
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::unused_io_amount)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/main.rs:191:20
[INFO] [stderr]     |
[INFO] [stderr] 191 |                 if pr_arr.len() == 0 {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `pr_arr.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:196:42
[INFO] [stderr]     |
[INFO] [stderr] 196 |                     fd_arr.extend(&[Some(write_end.clone()), Some(read_end.clone())]);
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `write_end`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/main.rs:196:67
[INFO] [stderr]     |
[INFO] [stderr] 196 |                     fd_arr.extend(&[Some(write_end.clone()), Some(read_end.clone())]);
[INFO] [stderr]     |                                                                   ^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `read_end`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust_shell`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bd3264ad41e64ab3d65164934ccf159bf5ba346254551a1cf970bd88329a3997"`
[INFO] running `"docker" "rm" "-f" "bd3264ad41e64ab3d65164934ccf159bf5ba346254551a1cf970bd88329a3997"`
[INFO] [stdout] bd3264ad41e64ab3d65164934ccf159bf5ba346254551a1cf970bd88329a3997