[INFO] updating cached repository stevefranchak/backup-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/stevefranchak/backup-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/stevefranchak/backup-rs" "work/ex/clippy-test-run/sources/stable/gh/stevefranchak/backup-rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/stevefranchak/backup-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/stevefranchak/backup-rs" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/stevefranchak/backup-rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/stevefranchak/backup-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c18859a068bd8829dfb48cc3e9425904b0dd0ac1
[INFO] sha for GitHub repo stevefranchak/backup-rs: c18859a068bd8829dfb48cc3e9425904b0dd0ac1
[INFO] validating manifest of stevefranchak/backup-rs 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 stevefranchak/backup-rs 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 stevefranchak/backup-rs
[INFO] finished frobbing stevefranchak/backup-rs
[INFO] frobbed toml for stevefranchak/backup-rs written to work/ex/clippy-test-run/sources/stable/gh/stevefranchak/backup-rs/Cargo.toml
[INFO] started frobbing stevefranchak/backup-rs
[INFO] finished frobbing stevefranchak/backup-rs
[INFO] frobbed toml for stevefranchak/backup-rs written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/stevefranchak/backup-rs/Cargo.toml
[INFO] crate stevefranchak/backup-rs 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 stevefranchak/backup-rs against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/stevefranchak/backup-rs:/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 -Dclippy::into_iter_on_array" "-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] ce7ed3cbb546ffc142ef98995e3cd794c83762cb31e324008785bd5119fdaaa3
[INFO] running `"docker" "start" "-a" "ce7ed3cbb546ffc142ef98995e3cd794c83762cb31e324008785bd5119fdaaa3"`
[INFO] [stderr]     Checking backup v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/utilities/iterator_list.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |             list: list,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `list`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/utilities/iterator_list.rs:19:13
[INFO] [stderr]    |
[INFO] [stderr] 19 |             list: list,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `list`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/config/mod.rs:97:12
[INFO] [stderr]     |
[INFO] [stderr] 97  |       } else {
[INFO] [stderr]     |  ____________^
[INFO] [stderr] 98  | |         if !config.should_show_help() {
[INFO] [stderr] 99  | |             return Err("missing file operand".to_string());
[INFO] [stderr] 100 | |         }
[INFO] [stderr] 101 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 97  |     } else if !config.should_show_help() {
[INFO] [stderr] 98  |     return Err("missing file operand".to_string());
[INFO] [stderr] 99  | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: Constants have by default a `'static` lifetime
[INFO] [stderr]   --> src/main.rs:13:19
[INFO] [stderr]    |
[INFO] [stderr] 13 | const PROG_NAME: &'static str = "backup";
[INFO] [stderr]    |                  -^^^^^^^---- help: consider removing `'static`: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::const_static_lifetime)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#const_static_lifetime
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/config/mod.rs:97:12
[INFO] [stderr]     |
[INFO] [stderr] 97  |       } else {
[INFO] [stderr]     |  ____________^
[INFO] [stderr] 98  | |         if !config.should_show_help() {
[INFO] [stderr] 99  | |             return Err("missing file operand".to_string());
[INFO] [stderr] 100 | |         }
[INFO] [stderr] 101 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 97  |     } else if !config.should_show_help() {
[INFO] [stderr] 98  |     return Err("missing file operand".to_string());
[INFO] [stderr] 99  | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: Constants have by default a `'static` lifetime
[INFO] [stderr]   --> src/main.rs:13:19
[INFO] [stderr]    |
[INFO] [stderr] 13 | const PROG_NAME: &'static str = "backup";
[INFO] [stderr]    |                  -^^^^^^^---- help: consider removing `'static`: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::const_static_lifetime)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#const_static_lifetime
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 | /         match self {
[INFO] [stderr] 18 | |             &ShortOpt(_) => true,
[INFO] [stderr] 19 | |             _ => false,
[INFO] [stderr] 20 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 17 |         match *self {
[INFO] [stderr] 18 |             ShortOpt(_) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 | /         match self {
[INFO] [stderr] 28 | |             &LongOpt(_, _) => true,
[INFO] [stderr] 29 | |             _ => false,
[INFO] [stderr] 30 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 27 |         match *self {
[INFO] [stderr] 28 |             LongOpt(_, _) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 | /         match self {
[INFO] [stderr] 38 | |             &Positional(_) => true,
[INFO] [stderr] 39 | |             _ => false,
[INFO] [stderr] 40 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 37 |         match *self {
[INFO] [stderr] 38 |             Positional(_) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:56:30
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if token.starts_with("-") { // non-expensive check to avoid regex matching every iteration
[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 don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/mod.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 | /         match arg {
[INFO] [stderr] 62 | |             &ShortOpt(ref name) => {
[INFO] [stderr] 63 | |                 match name.as_str() {
[INFO] [stderr] 64 | |                     "t" => config.set_should_truncate(true),
[INFO] [stderr] ...  |
[INFO] [stderr] 78 | |             &Positional(ref operand) => operands.push(operand),
[INFO] [stderr] 79 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 61 |         match *arg {
[INFO] [stderr] 62 |             ShortOpt(ref name) => {
[INFO] [stderr] 63 |                 match name.as_str() {
[INFO] [stderr] 64 |                     "t" => config.set_should_truncate(true),
[INFO] [stderr] 65 |                     _ => set_invalid_option(&mut invalid_option, Some(arg)),
[INFO] [stderr] 66 |                 }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/mod.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 | /         match invalid_option.unwrap() {
[INFO] [stderr] 86 | |             &ShortOpt(ref name) => return Err(format!("invalid option -- {}", name)),
[INFO] [stderr] 87 | |             &LongOpt(ref name, _) => return Err(format!("unrecognized option '{}'", name)),
[INFO] [stderr] 88 | |             _ => (),
[INFO] [stderr] 89 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 85 |         match *invalid_option.unwrap() {
[INFO] [stderr] 86 |             ShortOpt(ref name) => return Err(format!("invalid option -- {}", name)),
[INFO] [stderr] 87 |             LongOpt(ref name, _) => return Err(format!("unrecognized option '{}'", name)),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/config/mod.rs:95:8
[INFO] [stderr]    |
[INFO] [stderr] 95 |     if operands.len() > 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!operands.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: called `.get().unwrap()` on a Vec. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/config/mod.rs:96:29
[INFO] [stderr]    |
[INFO] [stderr] 96 |         config.set_filename(operands.get(0).unwrap().to_string());
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&operands[0]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:58:26
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn print_prog_error(err: &String) {
[INFO] [stderr]    |                          ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:17:9
[INFO] [stderr]    |
[INFO] [stderr] 17 | /         match self {
[INFO] [stderr] 18 | |             &ShortOpt(_) => true,
[INFO] [stderr] 19 | |             _ => false,
[INFO] [stderr] 20 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 17 |         match *self {
[INFO] [stderr] 18 |             ShortOpt(_) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:27:9
[INFO] [stderr]    |
[INFO] [stderr] 27 | /         match self {
[INFO] [stderr] 28 | |             &LongOpt(_, _) => true,
[INFO] [stderr] 29 | |             _ => false,
[INFO] [stderr] 30 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 27 |         match *self {
[INFO] [stderr] 28 |             LongOpt(_, _) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 | /         match self {
[INFO] [stderr] 38 | |             &Positional(_) => true,
[INFO] [stderr] 39 | |             _ => false,
[INFO] [stderr] 40 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 37 |         match *self {
[INFO] [stderr] 38 |             Positional(_) => true,
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: single-character string constant used as pattern
[INFO] [stderr]   --> src/config/cmd_line_parse.rs:56:30
[INFO] [stderr]    |
[INFO] [stderr] 56 |         if token.starts_with("-") { // non-expensive check to avoid regex matching every iteration
[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 don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/mod.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 | /         match arg {
[INFO] [stderr] 62 | |             &ShortOpt(ref name) => {
[INFO] [stderr] 63 | |                 match name.as_str() {
[INFO] [stderr] 64 | |                     "t" => config.set_should_truncate(true),
[INFO] [stderr] ...  |
[INFO] [stderr] 78 | |             &Positional(ref operand) => operands.push(operand),
[INFO] [stderr] 79 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 61 |         match *arg {
[INFO] [stderr] 62 |             ShortOpt(ref name) => {
[INFO] [stderr] 63 |                 match name.as_str() {
[INFO] [stderr] 64 |                     "t" => config.set_should_truncate(true),
[INFO] [stderr] 65 |                     _ => set_invalid_option(&mut invalid_option, Some(arg)),
[INFO] [stderr] 66 |                 }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/config/mod.rs:85:9
[INFO] [stderr]    |
[INFO] [stderr] 85 | /         match invalid_option.unwrap() {
[INFO] [stderr] 86 | |             &ShortOpt(ref name) => return Err(format!("invalid option -- {}", name)),
[INFO] [stderr] 87 | |             &LongOpt(ref name, _) => return Err(format!("unrecognized option '{}'", name)),
[INFO] [stderr] 88 | |             _ => (),
[INFO] [stderr] 89 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 85 |         match *invalid_option.unwrap() {
[INFO] [stderr] 86 |             ShortOpt(ref name) => return Err(format!("invalid option -- {}", name)),
[INFO] [stderr] 87 |             LongOpt(ref name, _) => return Err(format!("unrecognized option '{}'", name)),
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/config/mod.rs:95:8
[INFO] [stderr]    |
[INFO] [stderr] 95 |     if operands.len() > 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!operands.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: called `.get().unwrap()` on a Vec. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/config/mod.rs:96:29
[INFO] [stderr]    |
[INFO] [stderr] 96 |         config.set_filename(operands.get(0).unwrap().to_string());
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&operands[0]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/main.rs:58:26
[INFO] [stderr]    |
[INFO] [stderr] 58 | fn print_prog_error(err: &String) {
[INFO] [stderr]    |                          ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.26s
[INFO] running `"docker" "inspect" "ce7ed3cbb546ffc142ef98995e3cd794c83762cb31e324008785bd5119fdaaa3"`
[INFO] running `"docker" "rm" "-f" "ce7ed3cbb546ffc142ef98995e3cd794c83762cb31e324008785bd5119fdaaa3"`
[INFO] [stdout] ce7ed3cbb546ffc142ef98995e3cd794c83762cb31e324008785bd5119fdaaa3