[INFO] updating cached repository yurrriq/rust-in-action
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/yurrriq/rust-in-action
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/yurrriq/rust-in-action" "work/ex/clippy-test-run/sources/stable/gh/yurrriq/rust-in-action"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/yurrriq/rust-in-action'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/yurrriq/rust-in-action" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/yurrriq/rust-in-action"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/yurrriq/rust-in-action'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 03a91ef62a6a98733e690eb1522252caf94df0c3
[INFO] sha for GitHub repo yurrriq/rust-in-action: 03a91ef62a6a98733e690eb1522252caf94df0c3
[INFO] validating manifest of yurrriq/rust-in-action 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 yurrriq/rust-in-action 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 yurrriq/rust-in-action
[INFO] finished frobbing yurrriq/rust-in-action
[INFO] frobbed toml for yurrriq/rust-in-action written to work/ex/clippy-test-run/sources/stable/gh/yurrriq/rust-in-action/Cargo.toml
[INFO] started frobbing yurrriq/rust-in-action
[INFO] finished frobbing yurrriq/rust-in-action
[INFO] frobbed toml for yurrriq/rust-in-action written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/yurrriq/rust-in-action/Cargo.toml
[INFO] crate yurrriq/rust-in-action 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 yurrriq/rust-in-action against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/yurrriq/rust-in-action:/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] 103ff03c2a184f31991a3a488f35b340cb19af060013c17ea504b3716bfb2dd8
[INFO] running `"docker" "start" "-a" "103ff03c2a184f31991a3a488f35b340cb19af060013c17ea504b3716bfb2dd8"`
[INFO] [stderr]    Compiling libc v0.2.44
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]     Checking lazy_static v1.2.0
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]    Compiling memchr v2.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.0
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.1.0
[INFO] [stderr]    Compiling rand_pcg v0.1.1
[INFO] [stderr]    Compiling rand v0.6.1
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking rust-in-action v0.3.20 (/opt/crater/workdir)
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/bin/ch2-traversing-arrays.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: trivial regex
[INFO] [stderr]  --> src/bin/ch2-searching-with-regex.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let re = Regex::new("picture").unwrap();
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivial_regex)] on by default
[INFO] [stderr]   = help: consider using `str::contains`
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
[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/bin/ch2-searching-with-regex.rs:11:2
[INFO] [stderr]    |
[INFO] [stderr] 11 |       match re.find(line) {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 12 | |         Some(_) => println!("{}", line),
[INFO] [stderr] 13 | |         None    => (),
[INFO] [stderr] 14 | |     }
[INFO] [stderr]    | |_____^ help: try this: `if let Some(_) = re.find(line) { println!("{}", line) }`
[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] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/bin/ch2-introducing-vec.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     if tags.len() == 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tags.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: length comparison to zero
[INFO] [stderr]   --> src/bin/ch2-introducing-vec.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     if tags.len() == 0 {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `tags.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: the loop variable `idx` is only used to index `array`.
[INFO] [stderr]   --> src/bin/ch2-traversing-arrays.rs:16:20
[INFO] [stderr]    |
[INFO] [stderr] 16 |         for idx in 0..array.len() {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 16 |         for <item> in &array {
[INFO] [stderr]    |             ^^^^^^    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]   --> src/bin/ch2-generic-with-traits.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let c = add(a, b);
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: 6th binding whose name is just one char
[INFO] [stderr]   --> src/bin/ch2-generic-with-traits.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let z = add(x, y);
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: 5th binding whose name is just one char
[INFO] [stderr]   --> src/bin/ch2-generic-with-traits.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let c = add(a, b);
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::many_single_char_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: 6th binding whose name is just one char
[INFO] [stderr]   --> src/bin/ch2-generic-with-traits.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let z = add(x, y);
[INFO] [stderr]    |         ^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#many_single_char_names
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]  --> src/bin/ch2-generic-with-traits.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     return i + j;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ help: remove `return` as shown: `i + j`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:98:9
[INFO] [stderr]    |
[INFO] [stderr] 98 |         return Err(err_msg);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err_msg)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         return Ok(f);
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(f)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |         return Err(err_msg);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err_msg)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:111:9
[INFO] [stderr]     |
[INFO] [stderr] 111 |         return Ok(f);
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(f)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/ch2-first-steps.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     return i + j;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `i + j`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/ch2-first-steps.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     return i + j;
[INFO] [stderr]    |     ^^^^^^^^^^^^^ help: remove `return` as shown: `i + j`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]  --> src/bin/ch2-generic-with-traits.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 |     return i + j;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ help: remove `return` as shown: `i + j`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:12:37
[INFO] [stderr]    |
[INFO] [stderr] 12 |     rand::thread_rng().gen_bool(1.0/(n as f64))
[INFO] [stderr]    |                                     ^^^^^^^^^^ help: try: `f64::from(n)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: item `File` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | / impl File {
[INFO] [stderr] 45 | |     /// Create a new, empty `File`.
[INFO] [stderr] 46 | |     ///
[INFO] [stderr] 47 | |     /// # Examples
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |     }
[INFO] [stderr] 76 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: trivial regex
[INFO] [stderr]  --> src/bin/ch2-searching-with-regex.rs:4:25
[INFO] [stderr]   |
[INFO] [stderr] 4 |     let re = Regex::new("picture").unwrap();
[INFO] [stderr]   |                         ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivial_regex)] on by default
[INFO] [stderr]   = help: consider using `str::contains`
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivial_regex
[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/bin/ch2-searching-with-regex.rs:11:2
[INFO] [stderr]    |
[INFO] [stderr] 11 |       match re.find(line) {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 12 | |         Some(_) => println!("{}", line),
[INFO] [stderr] 13 | |         None    => (),
[INFO] [stderr] 14 | |     }
[INFO] [stderr]    | |_____^ help: try this: `if let Some(_) = re.find(line) { println!("{}", line) }`
[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] 
[INFO] [stderr] warning: using `println!("")`
[INFO] [stderr]   --> src/bin/ch2-traversing-arrays.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |         println!("");
[INFO] [stderr]    |         ^^^^^^^^^^^^ help: replace it with: `println!()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::println_empty_string)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:61:44
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn new_with_data(name: &str, data: &Vec<u8>) -> File {
[INFO] [stderr]    |                                            ^^^^^^^^
[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] help: change this to
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn new_with_data(name: &str, data: &[u8]) -> File {
[INFO] [stderr]    |                                            ^^^^^
[INFO] [stderr] help: change `data.clone()` to
[INFO] [stderr]    |
[INFO] [stderr] 63 |         f.data = data.to_owned();
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:98:9
[INFO] [stderr]    |
[INFO] [stderr] 98 |         return Err(err_msg);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err_msg)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:101:9
[INFO] [stderr]     |
[INFO] [stderr] 101 |         return Ok(f);
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(f)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |         return Err(err_msg);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err_msg)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/bin/ch3-mock-files.rs:111:9
[INFO] [stderr]     |
[INFO] [stderr] 111 |         return Ok(f);
[INFO] [stderr]     |         ^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(f)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `idx` is only used to index `array`.
[INFO] [stderr]   --> src/bin/ch2-traversing-arrays.rs:16:20
[INFO] [stderr]    |
[INFO] [stderr] 16 |         for idx in 0..array.len() {
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 16 |         for <item> in &array {
[INFO] [stderr]    |             ^^^^^^    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:12:37
[INFO] [stderr]    |
[INFO] [stderr] 12 |     rand::thread_rng().gen_bool(1.0/(n as f64))
[INFO] [stderr]    |                                     ^^^^^^^^^^ help: try: `f64::from(n)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: item `File` has a public `len` method but no corresponding `is_empty` method
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | / impl File {
[INFO] [stderr] 45 | |     /// Create a new, empty `File`.
[INFO] [stderr] 46 | |     ///
[INFO] [stderr] 47 | |     /// # Examples
[INFO] [stderr] ...  |
[INFO] [stderr] 75 | |     }
[INFO] [stderr] 76 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::len_without_is_empty)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/bin/ch3-mock-files.rs:61:44
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn new_with_data(name: &str, data: &Vec<u8>) -> File {
[INFO] [stderr]    |                                            ^^^^^^^^
[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] help: change this to
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn new_with_data(name: &str, data: &[u8]) -> File {
[INFO] [stderr]    |                                            ^^^^^
[INFO] [stderr] help: change `data.clone()` to
[INFO] [stderr]    |
[INFO] [stderr] 63 |         f.data = data.to_owned();
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 27.19s
[INFO] running `"docker" "inspect" "103ff03c2a184f31991a3a488f35b340cb19af060013c17ea504b3716bfb2dd8"`
[INFO] running `"docker" "rm" "-f" "103ff03c2a184f31991a3a488f35b340cb19af060013c17ea504b3716bfb2dd8"`
[INFO] [stdout] 103ff03c2a184f31991a3a488f35b340cb19af060013c17ea504b3716bfb2dd8