[INFO] updating cached repository GrossBetruger/ArithMaster
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/GrossBetruger/ArithMaster
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/GrossBetruger/ArithMaster" "work/ex/clippy-test-run/sources/stable/gh/GrossBetruger/ArithMaster"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/GrossBetruger/ArithMaster'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/GrossBetruger/ArithMaster" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/GrossBetruger/ArithMaster"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/GrossBetruger/ArithMaster'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 30a9b9069a41463ce99179d73f939d44137770fd
[INFO] sha for GitHub repo GrossBetruger/ArithMaster: 30a9b9069a41463ce99179d73f939d44137770fd
[INFO] validating manifest of GrossBetruger/ArithMaster 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 GrossBetruger/ArithMaster 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 GrossBetruger/ArithMaster
[INFO] finished frobbing GrossBetruger/ArithMaster
[INFO] frobbed toml for GrossBetruger/ArithMaster written to work/ex/clippy-test-run/sources/stable/gh/GrossBetruger/ArithMaster/Cargo.toml
[INFO] started frobbing GrossBetruger/ArithMaster
[INFO] finished frobbing GrossBetruger/ArithMaster
[INFO] frobbed toml for GrossBetruger/ArithMaster written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/GrossBetruger/ArithMaster/Cargo.toml
[INFO] crate GrossBetruger/ArithMaster 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 GrossBetruger/ArithMaster 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/GrossBetruger/ArithMaster:/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] 86f5a62ec7b085ee4d0800d847924068d76ba03657951b8c0e23f97713f5fe1a
[INFO] running `"docker" "start" "-a" "86f5a62ec7b085ee4d0800d847924068d76ba03657951b8c0e23f97713f5fe1a"`
[INFO] [stderr]     Checking arithmaster v0.1.3 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     return (a, b, (a + b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a + b) as f32)`
[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/main.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     return (a, b, (a - b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a - b) as f32)`
[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/main.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     return (a, b, (a * b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a * b) as f32)`
[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/main.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     return (a, e, a.pow(e as u32) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, e, a.pow(e as u32) as f32)`
[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/main.rs:98:5
[INFO] [stderr]    |
[INFO] [stderr] 98 |     return (a, b, a as f32 / b as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, a as f32 / b as f32)`
[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/main.rs:189:17
[INFO] [stderr]     |
[INFO] [stderr] 189 |                 return Ok(true);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(true)`
[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/main.rs:196:17
[INFO] [stderr]     |
[INFO] [stderr] 196 |                 return Ok(false);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(false)`
[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: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:143:5
[INFO] [stderr]     |
[INFO] [stderr] 143 | /     match num < 0 {
[INFO] [stderr] 144 | |         true => format!("({})", num),
[INFO] [stderr] 145 | |         false => format!("{}", num),
[INFO] [stderr] 146 | |     }
[INFO] [stderr]     | |_____^ help: consider using an if/else expression: `if num < 0 { format!("({})", num) } else { format!("{}", num) }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:284:9
[INFO] [stderr]     |
[INFO] [stderr] 284 | /         match ask_question(&current_question_type, &current_difficulty) {
[INFO] [stderr] 285 | |             true => {
[INFO] [stderr] 286 | |                 streak += 1;
[INFO] [stderr] 287 | |                 if streak % STREAK_CONSTANT == 0 {
[INFO] [stderr] ...   |
[INFO] [stderr] 333 | |             }
[INFO] [stderr] 334 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] help: consider using an if/else expression
[INFO] [stderr]     |
[INFO] [stderr] 284 |         if ask_question(&current_question_type, &current_difficulty) {
[INFO] [stderr] 285 |     streak += 1;
[INFO] [stderr] 286 |     if streak % STREAK_CONSTANT == 0 {
[INFO] [stderr] 287 |         let praise = PRAISES[praise_counter];
[INFO] [stderr] 288 |         if praise_counter < NUM_OF_PRAISES - 1 {
[INFO] [stderr] 289 |             praise_counter += 1;
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:294:21
[INFO] [stderr]     |
[INFO] [stderr] 294 | /                     match streak < SUPER_PRAISES_THRESHOLD {
[INFO] [stderr] 295 | |                         true => print_spaced(&say_praise(&praise)),
[INFO] [stderr] 296 | |                         _ => print_spaced(&say_super_praise(&praise)),
[INFO] [stderr] 297 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using an if/else expression: `if streak < SUPER_PRAISES_THRESHOLD { print_spaced(&say_praise(&praise)) } else { print_spaced(&say_super_praise(&praise)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     return (a, b, (a + b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a + b) as f32)`
[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/main.rs:77:5
[INFO] [stderr]    |
[INFO] [stderr] 77 |     return (a, b, (a - b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a - b) as f32)`
[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/main.rs:83:5
[INFO] [stderr]    |
[INFO] [stderr] 83 |     return (a, b, (a * b) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, (a * b) as f32)`
[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/main.rs:89:5
[INFO] [stderr]    |
[INFO] [stderr] 89 |     return (a, e, a.pow(e as u32) as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, e, a.pow(e as u32) as f32)`
[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/main.rs:98:5
[INFO] [stderr]    |
[INFO] [stderr] 98 |     return (a, b, a as f32 / b as f32);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `(a, b, a as f32 / b as f32)`
[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/main.rs:189:17
[INFO] [stderr]     |
[INFO] [stderr] 189 |                 return Ok(true);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(true)`
[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/main.rs:196:17
[INFO] [stderr]     |
[INFO] [stderr] 196 |                 return Ok(false);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Ok(false)`
[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: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:143:5
[INFO] [stderr]     |
[INFO] [stderr] 143 | /     match num < 0 {
[INFO] [stderr] 144 | |         true => format!("({})", num),
[INFO] [stderr] 145 | |         false => format!("{}", num),
[INFO] [stderr] 146 | |     }
[INFO] [stderr]     | |_____^ help: consider using an if/else expression: `if num < 0 { format!("({})", num) } else { format!("{}", num) }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_bool)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:284:9
[INFO] [stderr]     |
[INFO] [stderr] 284 | /         match ask_question(&current_question_type, &current_difficulty) {
[INFO] [stderr] 285 | |             true => {
[INFO] [stderr] 286 | |                 streak += 1;
[INFO] [stderr] 287 | |                 if streak % STREAK_CONSTANT == 0 {
[INFO] [stderr] ...   |
[INFO] [stderr] 333 | |             }
[INFO] [stderr] 334 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] help: consider using an if/else expression
[INFO] [stderr]     |
[INFO] [stderr] 284 |         if ask_question(&current_question_type, &current_difficulty) {
[INFO] [stderr] 285 |     streak += 1;
[INFO] [stderr] 286 |     if streak % STREAK_CONSTANT == 0 {
[INFO] [stderr] 287 |         let praise = PRAISES[praise_counter];
[INFO] [stderr] 288 |         if praise_counter < NUM_OF_PRAISES - 1 {
[INFO] [stderr] 289 |             praise_counter += 1;
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to match on a boolean expression
[INFO] [stderr]    --> src/main.rs:294:21
[INFO] [stderr]     |
[INFO] [stderr] 294 | /                     match streak < SUPER_PRAISES_THRESHOLD {
[INFO] [stderr] 295 | |                         true => print_spaced(&say_praise(&praise)),
[INFO] [stderr] 296 | |                         _ => print_spaced(&say_super_praise(&praise)),
[INFO] [stderr] 297 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using an if/else expression: `if streak < SUPER_PRAISES_THRESHOLD { print_spaced(&say_praise(&praise)) } else { print_spaced(&say_super_praise(&praise)) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_bool
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/main.rs:380:13
[INFO] [stderr]     |
[INFO] [stderr] 380 |             assert_eq!((a + b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::float_cmp)] on by default
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/main.rs:380:13
[INFO] [stderr]     |
[INFO] [stderr] 380 |             assert_eq!((a + b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/main.rs:388:13
[INFO] [stderr]     |
[INFO] [stderr] 388 |             assert_eq!((a - b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/main.rs:388:13
[INFO] [stderr]     |
[INFO] [stderr] 388 |             assert_eq!((a - b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/main.rs:396:13
[INFO] [stderr]     |
[INFO] [stderr] 396 |             assert_eq!((a * b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/main.rs:396:13
[INFO] [stderr]     |
[INFO] [stderr] 396 |             assert_eq!((a * b) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/main.rs:404:13
[INFO] [stderr]     |
[INFO] [stderr] 404 |             assert_eq!((a.pow(e as u32)) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/main.rs:404:13
[INFO] [stderr]     |
[INFO] [stderr] 404 |             assert_eq!((a.pow(e as u32)) as f32, res);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: handle written amount returned or use `Write::write_all` instead
[INFO] [stderr]    --> src/main.rs:432:9
[INFO] [stderr]     |
[INFO] [stderr] 432 |         file.write(input).expect("filed to write number to file");
[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] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `arithmaster`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "86f5a62ec7b085ee4d0800d847924068d76ba03657951b8c0e23f97713f5fe1a"`
[INFO] running `"docker" "rm" "-f" "86f5a62ec7b085ee4d0800d847924068d76ba03657951b8c0e23f97713f5fe1a"`
[INFO] [stdout] 86f5a62ec7b085ee4d0800d847924068d76ba03657951b8c0e23f97713f5fe1a