[INFO] updating cached repository torkeldanielsson/fraction_problems_generator
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/torkeldanielsson/fraction_problems_generator
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/torkeldanielsson/fraction_problems_generator" "work/ex/clippy-test-run/sources/stable/gh/torkeldanielsson/fraction_problems_generator"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/torkeldanielsson/fraction_problems_generator'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/torkeldanielsson/fraction_problems_generator" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/torkeldanielsson/fraction_problems_generator"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/torkeldanielsson/fraction_problems_generator'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e942164656ed3f27ab8754a9966ede1470d3fed5
[INFO] sha for GitHub repo torkeldanielsson/fraction_problems_generator: e942164656ed3f27ab8754a9966ede1470d3fed5
[INFO] validating manifest of torkeldanielsson/fraction_problems_generator 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 torkeldanielsson/fraction_problems_generator 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 torkeldanielsson/fraction_problems_generator
[INFO] finished frobbing torkeldanielsson/fraction_problems_generator
[INFO] frobbed toml for torkeldanielsson/fraction_problems_generator written to work/ex/clippy-test-run/sources/stable/gh/torkeldanielsson/fraction_problems_generator/Cargo.toml
[INFO] started frobbing torkeldanielsson/fraction_problems_generator
[INFO] finished frobbing torkeldanielsson/fraction_problems_generator
[INFO] frobbed toml for torkeldanielsson/fraction_problems_generator written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/torkeldanielsson/fraction_problems_generator/Cargo.toml
[INFO] crate torkeldanielsson/fraction_problems_generator 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 torkeldanielsson/fraction_problems_generator 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-7/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/torkeldanielsson/fraction_problems_generator:/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] 60f13e14a50444604333da9157ba780d484f1d5dfe5f200e1349f78dc6630b84
[INFO] running `"docker" "start" "-a" "60f13e14a50444604333da9157ba780d484f1d5dfe5f200e1349f78dc6630b84"`
[INFO] [stderr]     Checking math_gen v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the function has a cyclomatic complexity of 90
[INFO] [stderr]    --> src/main.rs:8:1
[INFO] [stderr]     |
[INFO] [stderr] 8   | / fn main() {
[INFO] [stderr] 9   | |
[INFO] [stderr] 10  | |     let foff = false;
[INFO] [stderr] 11  | |     let linn = false;
[INFO] [stderr] ...   |
[INFO] [stderr] 744 | |     file.write_all(b"\\end{document}\n").expect("7");
[INFO] [stderr] 745 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:117:27
[INFO] [stderr]     |
[INFO] [stderr] 117 |         let mut problem = format!("\\(");
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: consider using .to_string(): `"\\(".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:120:13
[INFO] [stderr]     |
[INFO] [stderr] 120 | /             let mut rnd_start = 0;
[INFO] [stderr] 121 | |             if a_ints != 1 && j == 0 {
[INFO] [stderr] 122 | |                 rnd_start = 1;
[INFO] [stderr] 123 | |             }
[INFO] [stderr]     | |_____________^ help: it is more idiomatic to write: `let <mut> rnd_start = if a_ints != 1 && j == 0 { 1 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_let_if_seq)] on by default
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 | /             let mut rnd_start = 0;
[INFO] [stderr] 134 | |             if b_ints != 1 && j == 0 {
[INFO] [stderr] 135 | |                 rnd_start = 1;
[INFO] [stderr] 136 | |             }
[INFO] [stderr]     | |_____________^ help: it is more idiomatic to write: `let <mut> rnd_start = if b_ints != 1 && j == 0 { 1 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `a` and `b` manually
[INFO] [stderr]    --> src/main.rs:169:13
[INFO] [stderr]     |
[INFO] [stderr] 169 | /             let tmp = a;
[INFO] [stderr] 170 | |             a = b;
[INFO] [stderr] 171 | |             b = tmp;
[INFO] [stderr]     | |___________________^ help: try: `std::mem::swap(&mut a, &mut b)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]     = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:173:27
[INFO] [stderr]     |
[INFO] [stderr] 173 |         let mut problem = format!("\\(");
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: consider using .to_string(): `"\\(".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:232:9
[INFO] [stderr]     |
[INFO] [stderr] 232 | /         let mut sign = "+";
[INFO] [stderr] 233 | |         if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 234 | |             sign = "-";
[INFO] [stderr] 235 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:268:9
[INFO] [stderr]     |
[INFO] [stderr] 268 | /         let mut sign = "+";
[INFO] [stderr] 269 | |         if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 270 | |             sign = "-";
[INFO] [stderr] 271 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:273:9
[INFO] [stderr]     |
[INFO] [stderr] 273 | /         let problem;
[INFO] [stderr] 274 | |
[INFO] [stderr] 275 | |         if i % 2 == 1 {
[INFO] [stderr] 276 | |             problem = format!("\\({}{} {} {} = {} \\quad \\rightarrow \\quad {} =\\)\\\\\\\n\n", a, selected_char, sign, b, c, selected_char);
[INFO] [stderr] ...   |
[INFO] [stderr] 282 | |             problem = format!("\\({} {} {}{} = {} \\quad \\rightarrow \\quad {} =\\)\\\\\\\n\n", a, sign, b, selected_char, c, selected_char);
[INFO] [stderr] 283 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let problem = if i % 2 == 1 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { ..; $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:310:9
[INFO] [stderr]     |
[INFO] [stderr] 310 | /         let mut problem: String;
[INFO] [stderr] 311 | |         if rand::distributions::Range::new(0, 4).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 312 | |             problem = format!("\\( - \\dfrac{{{}}}{{{}}}", a, b);
[INFO] [stderr] 313 | |         } else {
[INFO] [stderr] 314 | |             problem = format!("\\(\\dfrac{{{}}}{{{}}}", a, b);
[INFO] [stderr] 315 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> problem = if rand::distributions::Range::new(0, 4).ind_sample(&mut rng) == 0 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `j` is only used to index `digit_slice`.
[INFO] [stderr]    --> src/main.rs:349:18
[INFO] [stderr]     |
[INFO] [stderr] 349 |         for j in 0..3 {
[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] 349 |         for <item> in digit_slice.iter().take(3) {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:355:28
[INFO] [stderr]     |
[INFO] [stderr] 355 |         chosen_digits.push(format!("{}", c));
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `c.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:375:9
[INFO] [stderr]     |
[INFO] [stderr] 375 | /         let problem;
[INFO] [stderr] 376 | |         if i % 2 == 1 {
[INFO] [stderr] 377 | |             problem = format!("\\(\\dfrac{{{}}}{{{}}} = \\)\\\\\\\n\n", n, d);
[INFO] [stderr] 378 | |         } else {
[INFO] [stderr] 379 | |             problem = format!("\\({} / {} = \\)\\\\\\\n\n", n, d);
[INFO] [stderr] 380 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let problem = if i % 2 == 1 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:402:9
[INFO] [stderr]     |
[INFO] [stderr] 402 | /         let mut units = vec![/*"\\mu m", */"mm", "cm", "dm", "m", "km"];
[INFO] [stderr] 403 | |
[INFO] [stderr] 404 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 405 | |             units = vec![/*"\\mu m", */"mg", "g", "hg", "kg", "ton"];
[INFO] [stderr] 406 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> units = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ) } else { < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:442:30
[INFO] [stderr]     |
[INFO] [stderr] 442 |         let prefixes = match unit.as_ref() {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:475:30
[INFO] [stderr]     |
[INFO] [stderr] 475 |         let prefixes = match unit.as_ref() {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:492:28
[INFO] [stderr]     |
[INFO] [stderr] 492 |         let stuffs = match unit.as_ref() {
[INFO] [stderr]     |                            ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/main.rs:539:9
[INFO] [stderr]     |
[INFO] [stderr] 539 |         a = a/b;
[INFO] [stderr]     |         ^^^^^^^ help: replace it with: `a /= b`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:554:9
[INFO] [stderr]     |
[INFO] [stderr] 554 | /         let mut first_term = format!("{}", selected_char);
[INFO] [stderr] 555 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 556 | |             first_term = format!("{}", rand::distributions::Range::new(2, 13).ind_sample(&mut rng));
[INFO] [stderr] 557 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> first_term = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:559:9
[INFO] [stderr]     |
[INFO] [stderr] 559 | /         let mut sign = "+";
[INFO] [stderr] 560 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 561 | |             sign = "-";
[INFO] [stderr] 562 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:564:9
[INFO] [stderr]     |
[INFO] [stderr] 564 | /         let mut second_term = format!("({} {} {})", selected_char, sign, rand::distributions::Range::new(2, 13).ind_sample(&mut rng));
[INFO] [stderr] 565 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 566 | |             second_term = format!("({} {} {})", rand::distributions::Range::new(2, 13).ind_sample(&mut rng), sign, selected_char);
[INFO] [stderr] 567 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> second_term = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:569:9
[INFO] [stderr]     |
[INFO] [stderr] 569 | /         let mut pre_sign = "";
[INFO] [stderr] 570 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 571 | |             pre_sign = "-";
[INFO] [stderr] 572 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> pre_sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:574:9
[INFO] [stderr]     |
[INFO] [stderr] 574 | /         let mut problem = format!("\\( {}{}{} =\\)\\\\\\\n\n", pre_sign, first_term, second_term);
[INFO] [stderr] 575 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 576 | |             problem = format!("\\( {}{}{} =\\)\\\\\\\n\n", pre_sign, second_term, first_term);
[INFO] [stderr] 577 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> problem = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:554:30
[INFO] [stderr]     |
[INFO] [stderr] 554 |         let mut first_term = format!("{}", selected_char);
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `selected_char.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: the loop variable `i` is only used to index `inner_terms`.
[INFO] [stderr]    --> src/main.rs:590:18
[INFO] [stderr]     |
[INFO] [stderr] 590 |         for i in 0..inner_terms.len() {
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[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] 590 |         for <item> in &mut inner_terms {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:594:34
[INFO] [stderr]     |
[INFO] [stderr] 594 |                 inner_terms[i] = format!("{}", rng.choose(&selected_chars).expect(""));
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&selected_chars).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:603:17
[INFO] [stderr]     |
[INFO] [stderr] 603 | /                 let mut sign = "+";
[INFO] [stderr] 604 | |                 if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 605 | |                     sign = "-";
[INFO] [stderr] 606 | |                 }
[INFO] [stderr]     | |_________________^ help: it is more idiomatic to write: `let <mut> sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:618:35
[INFO] [stderr]     |
[INFO] [stderr] 618 |         let height: f64 = scale * (rand::distributions::Range::new(5, 50).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(5, 50).ind_sample(&mut rng))`
[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: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:619:33
[INFO] [stderr]     |
[INFO] [stderr] 619 |         let xpos: f64 = scale * (rand::distributions::Range::new(-15, 65).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(-15, 65).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:621:30
[INFO] [stderr]     |
[INFO] [stderr] 621 |         let angle_a = (180.0/3.14159)*((base*xpos) / (base*((xpos*xpos + height*height).sqrt()))).acos();
[INFO] [stderr]     |                              ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::approx_constant)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:623:30
[INFO] [stderr]     |
[INFO] [stderr] 623 |         let angle_c = (180.0/3.14159)*((-base*xpos_2) / (base*((xpos_2*xpos_2 + height*height).sqrt()))).acos();
[INFO] [stderr]     |                              ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:631:37
[INFO] [stderr]     |
[INFO] [stderr] 631 |         let selected_char: String = format!("{}", rng.choose(&chars).expect(""));
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&chars).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:676:35
[INFO] [stderr]     |
[INFO] [stderr] 676 |         let height: f64 = scale * (rand::distributions::Range::new(5, 50).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(5, 50).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:677:33
[INFO] [stderr]     |
[INFO] [stderr] 677 |         let xpos: f64 = scale * (rand::distributions::Range::new(-15, 65).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(-15, 65).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:679:31
[INFO] [stderr]     |
[INFO] [stderr] 679 |         let angle_a = ((180.0/3.14159)*((base*xpos) / (base*((xpos*xpos + height*height).sqrt()))).acos()).floor();
[INFO] [stderr]     |                               ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:681:31
[INFO] [stderr]     |
[INFO] [stderr] 681 |         let angle_c = ((180.0/3.14159)*((-base*xpos_2) / (base*((xpos_2*xpos_2 + height*height).sqrt()))).acos()).floor();
[INFO] [stderr]     |                               ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:688:37
[INFO] [stderr]     |
[INFO] [stderr] 688 |         let len_modifier: f64 = 0.1*(rand::distributions::Range::new(1, 20).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(1, 20).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:693:28
[INFO] [stderr]     |
[INFO] [stderr] 693 |         let unit: String = format!("{}", rng.choose(&units).expect(""));
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&units).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `math_gen`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: the function has a cyclomatic complexity of 90
[INFO] [stderr]    --> src/main.rs:8:1
[INFO] [stderr]     |
[INFO] [stderr] 8   | / fn main() {
[INFO] [stderr] 9   | |
[INFO] [stderr] 10  | |     let foff = false;
[INFO] [stderr] 11  | |     let linn = false;
[INFO] [stderr] ...   |
[INFO] [stderr] 744 | |     file.write_all(b"\\end{document}\n").expect("7");
[INFO] [stderr] 745 | | }
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::cyclomatic_complexity)] on by default
[INFO] [stderr]     = help: you could split it up into multiple smaller functions
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cyclomatic_complexity
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:117:27
[INFO] [stderr]     |
[INFO] [stderr] 117 |         let mut problem = format!("\\(");
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: consider using .to_string(): `"\\(".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:120:13
[INFO] [stderr]     |
[INFO] [stderr] 120 | /             let mut rnd_start = 0;
[INFO] [stderr] 121 | |             if a_ints != 1 && j == 0 {
[INFO] [stderr] 122 | |                 rnd_start = 1;
[INFO] [stderr] 123 | |             }
[INFO] [stderr]     | |_____________^ help: it is more idiomatic to write: `let <mut> rnd_start = if a_ints != 1 && j == 0 { 1 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_let_if_seq)] on by default
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 | /             let mut rnd_start = 0;
[INFO] [stderr] 134 | |             if b_ints != 1 && j == 0 {
[INFO] [stderr] 135 | |                 rnd_start = 1;
[INFO] [stderr] 136 | |             }
[INFO] [stderr]     | |_____________^ help: it is more idiomatic to write: `let <mut> rnd_start = if b_ints != 1 && j == 0 { 1 } else { 0 };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: this looks like you are swapping `a` and `b` manually
[INFO] [stderr]    --> src/main.rs:169:13
[INFO] [stderr]     |
[INFO] [stderr] 169 | /             let tmp = a;
[INFO] [stderr] 170 | |             a = b;
[INFO] [stderr] 171 | |             b = tmp;
[INFO] [stderr]     | |___________________^ help: try: `std::mem::swap(&mut a, &mut b)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::manual_swap)] on by default
[INFO] [stderr]     = note: or maybe you should use `std::mem::replace`?
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_swap
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:173:27
[INFO] [stderr]     |
[INFO] [stderr] 173 |         let mut problem = format!("\\(");
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: consider using .to_string(): `"\\(".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:232:9
[INFO] [stderr]     |
[INFO] [stderr] 232 | /         let mut sign = "+";
[INFO] [stderr] 233 | |         if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 234 | |             sign = "-";
[INFO] [stderr] 235 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:268:9
[INFO] [stderr]     |
[INFO] [stderr] 268 | /         let mut sign = "+";
[INFO] [stderr] 269 | |         if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 270 | |             sign = "-";
[INFO] [stderr] 271 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if rand::distributions::Range::new(0, 2).ind_sample(&mut rng) == 0 { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:273:9
[INFO] [stderr]     |
[INFO] [stderr] 273 | /         let problem;
[INFO] [stderr] 274 | |
[INFO] [stderr] 275 | |         if i % 2 == 1 {
[INFO] [stderr] 276 | |             problem = format!("\\({}{} {} {} = {} \\quad \\rightarrow \\quad {} =\\)\\\\\\\n\n", a, selected_char, sign, b, c, selected_char);
[INFO] [stderr] ...   |
[INFO] [stderr] 282 | |             problem = format!("\\({} {} {}{} = {} \\quad \\rightarrow \\quad {} =\\)\\\\\\\n\n", a, sign, b, selected_char, c, selected_char);
[INFO] [stderr] 283 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let problem = if i % 2 == 1 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { ..; $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:310:9
[INFO] [stderr]     |
[INFO] [stderr] 310 | /         let mut problem: String;
[INFO] [stderr] 311 | |         if rand::distributions::Range::new(0, 4).ind_sample(&mut rng) == 0 {
[INFO] [stderr] 312 | |             problem = format!("\\( - \\dfrac{{{}}}{{{}}}", a, b);
[INFO] [stderr] 313 | |         } else {
[INFO] [stderr] 314 | |             problem = format!("\\(\\dfrac{{{}}}{{{}}}", a, b);
[INFO] [stderr] 315 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> problem = if rand::distributions::Range::new(0, 4).ind_sample(&mut rng) == 0 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `j` is only used to index `digit_slice`.
[INFO] [stderr]    --> src/main.rs:349:18
[INFO] [stderr]     |
[INFO] [stderr] 349 |         for j in 0..3 {
[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] 349 |         for <item> in digit_slice.iter().take(3) {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:355:28
[INFO] [stderr]     |
[INFO] [stderr] 355 |         chosen_digits.push(format!("{}", c));
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `c.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:375:9
[INFO] [stderr]     |
[INFO] [stderr] 375 | /         let problem;
[INFO] [stderr] 376 | |         if i % 2 == 1 {
[INFO] [stderr] 377 | |             problem = format!("\\(\\dfrac{{{}}}{{{}}} = \\)\\\\\\\n\n", n, d);
[INFO] [stderr] 378 | |         } else {
[INFO] [stderr] 379 | |             problem = format!("\\({} / {} = \\)\\\\\\\n\n", n, d);
[INFO] [stderr] 380 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let problem = if i % 2 == 1 { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:402:9
[INFO] [stderr]     |
[INFO] [stderr] 402 | /         let mut units = vec![/*"\\mu m", */"mm", "cm", "dm", "m", "km"];
[INFO] [stderr] 403 | |
[INFO] [stderr] 404 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 405 | |             units = vec![/*"\\mu m", */"mg", "g", "hg", "kg", "ton"];
[INFO] [stderr] 406 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> units = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ) } else { < [ _ ] > :: into_vec ( box [ $ ( $ x ) , * ] ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:442:30
[INFO] [stderr]     |
[INFO] [stderr] 442 |         let prefixes = match unit.as_ref() {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_asref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:475:30
[INFO] [stderr]     |
[INFO] [stderr] 475 |         let prefixes = match unit.as_ref() {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: this call to `as_ref` does nothing
[INFO] [stderr]    --> src/main.rs:492:28
[INFO] [stderr]     |
[INFO] [stderr] 492 |         let stuffs = match unit.as_ref() {
[INFO] [stderr]     |                            ^^^^^^^^^^^^^ help: try this: `unit`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_asref
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/main.rs:539:9
[INFO] [stderr]     |
[INFO] [stderr] 539 |         a = a/b;
[INFO] [stderr]     |         ^^^^^^^ help: replace it with: `a /= b`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:554:9
[INFO] [stderr]     |
[INFO] [stderr] 554 | /         let mut first_term = format!("{}", selected_char);
[INFO] [stderr] 555 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 556 | |             first_term = format!("{}", rand::distributions::Range::new(2, 13).ind_sample(&mut rng));
[INFO] [stderr] 557 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> first_term = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:559:9
[INFO] [stderr]     |
[INFO] [stderr] 559 | /         let mut sign = "+";
[INFO] [stderr] 560 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 561 | |             sign = "-";
[INFO] [stderr] 562 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:564:9
[INFO] [stderr]     |
[INFO] [stderr] 564 | /         let mut second_term = format!("({} {} {})", selected_char, sign, rand::distributions::Range::new(2, 13).ind_sample(&mut rng));
[INFO] [stderr] 565 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 566 | |             second_term = format!("({} {} {})", rand::distributions::Range::new(2, 13).ind_sample(&mut rng), sign, selected_char);
[INFO] [stderr] 567 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> second_term = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:569:9
[INFO] [stderr]     |
[INFO] [stderr] 569 | /         let mut pre_sign = "";
[INFO] [stderr] 570 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 571 | |             pre_sign = "-";
[INFO] [stderr] 572 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> pre_sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:574:9
[INFO] [stderr]     |
[INFO] [stderr] 574 | /         let mut problem = format!("\\( {}{}{} =\\)\\\\\\\n\n", pre_sign, first_term, second_term);
[INFO] [stderr] 575 | |         if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 576 | |             problem = format!("\\( {}{}{} =\\)\\\\\\\n\n", pre_sign, second_term, first_term);
[INFO] [stderr] 577 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> problem = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) } else { $ crate :: fmt :: format ( format_args ! ( $ ( $ arg ) * ) ) };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:554:30
[INFO] [stderr]     |
[INFO] [stderr] 554 |         let mut first_term = format!("{}", selected_char);
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `selected_char.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: the loop variable `i` is only used to index `inner_terms`.
[INFO] [stderr]    --> src/main.rs:590:18
[INFO] [stderr]     |
[INFO] [stderr] 590 |         for i in 0..inner_terms.len() {
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[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] 590 |         for <item> in &mut inner_terms {
[INFO] [stderr]     |             ^^^^^^    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:594:34
[INFO] [stderr]     |
[INFO] [stderr] 594 |                 inner_terms[i] = format!("{}", rng.choose(&selected_chars).expect(""));
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&selected_chars).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/main.rs:603:17
[INFO] [stderr]     |
[INFO] [stderr] 603 | /                 let mut sign = "+";
[INFO] [stderr] 604 | |                 if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) {
[INFO] [stderr] 605 | |                     sign = "-";
[INFO] [stderr] 606 | |                 }
[INFO] [stderr]     | |_________________^ help: it is more idiomatic to write: `let <mut> sign = if 0 == rand::distributions::Range::new(0, 2).ind_sample(&mut rng) { "-" } else { "+" };`
[INFO] [stderr]     |
[INFO] [stderr]     = note: you might not need `mut` at all
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_let_if_seq
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:618:35
[INFO] [stderr]     |
[INFO] [stderr] 618 |         let height: f64 = scale * (rand::distributions::Range::new(5, 50).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(5, 50).ind_sample(&mut rng))`
[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: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:619:33
[INFO] [stderr]     |
[INFO] [stderr] 619 |         let xpos: f64 = scale * (rand::distributions::Range::new(-15, 65).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(-15, 65).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:621:30
[INFO] [stderr]     |
[INFO] [stderr] 621 |         let angle_a = (180.0/3.14159)*((base*xpos) / (base*((xpos*xpos + height*height).sqrt()))).acos();
[INFO] [stderr]     |                              ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::approx_constant)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:623:30
[INFO] [stderr]     |
[INFO] [stderr] 623 |         let angle_c = (180.0/3.14159)*((-base*xpos_2) / (base*((xpos_2*xpos_2 + height*height).sqrt()))).acos();
[INFO] [stderr]     |                              ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:631:37
[INFO] [stderr]     |
[INFO] [stderr] 631 |         let selected_char: String = format!("{}", rng.choose(&chars).expect(""));
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&chars).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:676:35
[INFO] [stderr]     |
[INFO] [stderr] 676 |         let height: f64 = scale * (rand::distributions::Range::new(5, 50).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(5, 50).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:677:33
[INFO] [stderr]     |
[INFO] [stderr] 677 |         let xpos: f64 = scale * (rand::distributions::Range::new(-15, 65).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(-15, 65).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:679:31
[INFO] [stderr]     |
[INFO] [stderr] 679 |         let angle_a = ((180.0/3.14159)*((base*xpos) / (base*((xpos*xpos + height*height).sqrt()))).acos()).floor();
[INFO] [stderr]     |                               ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/main.rs:681:31
[INFO] [stderr]     |
[INFO] [stderr] 681 |         let angle_c = ((180.0/3.14159)*((-base*xpos_2) / (base*((xpos_2*xpos_2 + height*height).sqrt()))).acos()).floor();
[INFO] [stderr]     |                               ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: casting i32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:688:37
[INFO] [stderr]     |
[INFO] [stderr] 688 |         let len_modifier: f64 = 0.1*(rand::distributions::Range::new(1, 20).ind_sample(&mut rng) as f64);
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(rand::distributions::Range::new(1, 20).ind_sample(&mut rng))`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/main.rs:693:28
[INFO] [stderr]     |
[INFO] [stderr] 693 |         let unit: String = format!("{}", rng.choose(&units).expect(""));
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using .to_string(): `rng.choose(&units).expect("").to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[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: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `math_gen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "60f13e14a50444604333da9157ba780d484f1d5dfe5f200e1349f78dc6630b84"`
[INFO] running `"docker" "rm" "-f" "60f13e14a50444604333da9157ba780d484f1d5dfe5f200e1349f78dc6630b84"`
[INFO] [stdout] 60f13e14a50444604333da9157ba780d484f1d5dfe5f200e1349f78dc6630b84