[INFO] cloning repository https://github.com/cursorweb/leetcode-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cursorweb/leetcode-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcursorweb%2Fleetcode-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcursorweb%2Fleetcode-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a4396f3951296fbf306670b523fd4e65d960bb63
[INFO] linting cursorweb/leetcode-rs against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcursorweb%2Fleetcode-rs" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/cursorweb/leetcode-rs
[INFO] finished tweaking git repo https://github.com/cursorweb/leetcode-rs
[INFO] tweaked toml for git repo https://github.com/cursorweb/leetcode-rs written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/cursorweb/leetcode-rs on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/cursorweb/leetcode-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7eea95730c7084cde179ca8c912d8ea11a00f726e3f0b26bdd02131b1e413bd4
[INFO] running `Command { std: "docker" "start" "-a" "7eea95730c7084cde179ca8c912d8ea11a00f726e3f0b26bdd02131b1e413bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7eea95730c7084cde179ca8c912d8ea11a00f726e3f0b26bdd02131b1e413bd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7eea95730c7084cde179ca8c912d8ea11a00f726e3f0b26bdd02131b1e413bd4", kill_on_drop: false }`
[INFO] [stdout] 7eea95730c7084cde179ca8c912d8ea11a00f726e3f0b26bdd02131b1e413bd4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b8cb309e3a8fe5422903594699db766599f0df39e2f415d30cce2d72e771cd62
[INFO] running `Command { std: "docker" "start" "-a" "b8cb309e3a8fe5422903594699db766599f0df39e2f415d30cce2d72e771cd62", kill_on_drop: false }`
[INFO] [stderr]     Checking beta v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/fun/linkedlist.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         if v.len() == 0 {
[INFO] [stdout]    |            ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `v.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/fun/linkedlist.rs:67:25
[INFO] [stdout]    |
[INFO] [stdout] 67 |             None => Err(String::from(format!("{:?} not found in linked list", val))),
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{:?} not found in linked list", val)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]    = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/fun/linkedlist.rs:84:32
[INFO] [stdout]    |
[INFO] [stdout] 84 |                     return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/fun/linkedlist.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]     = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 120 -         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout] 120 +         Err(String::from(format!("{} out of bounds.", idx)))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/fun/linkedlist.rs:115:32
[INFO] [stdout]     |
[INFO] [stdout] 115 |                     return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/fun/linkedlist.rs:120:20
[INFO] [stdout]     |
[INFO] [stdout] 120 |         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 |     while !left.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:24:11
[INFO] [stdout]    |
[INFO] [stdout] 24 |     while !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:42:11
[INFO] [stdout]    |
[INFO] [stdout] 42 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:42:37
[INFO] [stdout]    |
[INFO] [stdout] 42 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:51:11
[INFO] [stdout]    |
[INFO] [stdout] 51 |     while !left.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:54:11
[INFO] [stdout]    |
[INFO] [stdout] 54 |     while !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stdout]   --> src/fun/dictreq.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 | /         if self.vals.contains_key(&key) {
[INFO] [stdout] 37 | |             self.vals.insert(key, val);
[INFO] [stdout] 38 | |             return Ok(());
[INFO] [stdout] 39 | |         } else if let Some(ref enclosing) = self.enclosing {
[INFO] [stdout] 40 | |             return enclosing.borrow_mut().assign(key, val);
[INFO] [stdout] 41 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using the `Entry` API: https://doc.rust-lang.org/std/collections/struct.HashMap.html#entry-api
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stdout]    = note: `#[warn(clippy::map_entry)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/practice/invert_tree.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         return Box::new(tree);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 11 -         return Box::new(tree);
[INFO] [stdout] 11 +         Box::new(tree)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: binary comparison to literal `Option::None`
[INFO] [stdout]   --> src/practice/invert_tree.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if tree.left == None && tree.right == None {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `tree.left.is_none()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_to_none
[INFO] [stdout]    = note: `#[warn(clippy::partialeq_to_none)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: binary comparison to literal `Option::None`
[INFO] [stdout]   --> src/practice/invert_tree.rs:10:29
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if tree.left == None && tree.right == None {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `tree.right.is_none()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_to_none
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual implementation of `Option::map`
[INFO] [stdout]   --> src/practice/invert_tree.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |               left: match tree.right {
[INFO] [stdout]    |  ___________________^
[INFO] [stdout] 16 | |                 Some(t) => Some(invert_tree(*t)),
[INFO] [stdout] 17 | |                 None => None,
[INFO] [stdout] 18 | |             },
[INFO] [stdout]    | |_____________^ help: try: `tree.right.map(|t| invert_tree(*t))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_map
[INFO] [stdout]    = note: `#[warn(clippy::manual_map)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual implementation of `Option::map`
[INFO] [stdout]   --> src/practice/invert_tree.rs:19:20
[INFO] [stdout]    |
[INFO] [stdout] 19 |               right: match tree.left {
[INFO] [stdout]    |  ____________________^
[INFO] [stdout] 20 | |                 Some(t) => Some(invert_tree(*t)),
[INFO] [stdout] 21 | |                 None => None,
[INFO] [stdout] 22 | |             },
[INFO] [stdout]    | |_____________^ help: try: `tree.left.map(|t| invert_tree(*t))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_map
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.zip()` with a range and `.len()`
[INFO] [stdout]  --> src/practice/twosum.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 |     for (i, idx) in nums.iter().zip(0..nums.len()) {
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_zip_with_len
[INFO] [stdout]   = note: `#[warn(clippy::range_zip_with_len)]` on by default
[INFO] [stdout] help: use
[INFO] [stdout]   |
[INFO] [stdout] 3 -     for (i, idx) in nums.iter().zip(0..nums.len()) {
[INFO] [stdout] 3 +     for (idx, i) in nums.iter().enumerate() {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: literal with an empty format string
[INFO] [stdout]   --> src/snippets.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |             "{5: {6: {7, 8}, 7}}",
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stdout]    = note: `#[warn(clippy::print_literal)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]    |
[INFO] [stdout] 36 -             "Invert_Tree({}) {:?}",
[INFO] [stdout] 37 -             "{5: {6: {7, 8}, 7}}",
[INFO] [stdout] 36 +             "Invert_Tree({{5: {{6: {{7, 8}}, 7}}}}) {:?}",
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `print!()` with a format string that ends in a single newline
[INFO] [stdout]   --> src/snippets.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |         print!("]\n");
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stdout]    = note: `#[warn(clippy::print_with_newline)]` on by default
[INFO] [stdout] help: use `println!` instead
[INFO] [stdout]    |
[INFO] [stdout] 84 -         print!("]\n");
[INFO] [stdout] 84 +         println!("]");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `print!()` with a format string that ends in a single newline
[INFO] [stdout]   --> src/snippets.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         print!("]\n");
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stdout] help: use `println!` instead
[INFO] [stdout]    |
[INFO] [stdout] 95 -         print!("]\n");
[INFO] [stdout] 95 +         println!("]");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/fun/linkedlist.rs:31:12
[INFO] [stdout]    |
[INFO] [stdout] 31 |         if v.len() == 0 {
[INFO] [stdout]    |            ^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `v.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]    --> src/snippets.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 | /         match env.assign("null".into(), 7) {
[INFO] [stdout] 126 | |             Err(()) => println!("null is undef"),
[INFO] [stdout] 127 | |             Ok(()) => {}
[INFO] [stdout] 128 | |         }
[INFO] [stdout]     | |_________^ help: try: `if let Err(()) = env.assign("null".into(), 7) { println!("null is undef") }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]     = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]    --> src/snippets.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 | /         match counter.incr() {
[INFO] [stdout] 145 | |             Ok(_) => {}
[INFO] [stdout] 146 | |             Err(_) => {}
[INFO] [stdout] 147 | |         }
[INFO] [stdout]     | |_________^ help: try: `if let Ok(_) = counter.incr() {}`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/main.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if args.len() == 0 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `args.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/main.rs:58:28
[INFO] [stdout]    |
[INFO] [stdout] 58 |                       return Err(println!(
[INFO] [stdout]    |  ____________________________^
[INFO] [stdout] 59 | |                         "Unknown snippet '{}'.
[INFO] [stdout] 60 | | Valid Snippets:
[INFO] [stdout] 61 | | {}",
[INFO] [stdout] ...  |
[INFO] [stdout] 67 | |                             .join("\n")
[INFO] [stdout] 68 | |                     ));
[INFO] [stdout]    | |______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout]    = note: `#[warn(clippy::unit_arg)]` on by default
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 58 ~                     return {
[INFO] [stdout] 59 +                         println!(
[INFO] [stdout] 60 +                                                 "Unknown snippet '{}'.
[INFO] [stdout] 61 +                         Valid Snippets:
[INFO] [stdout] 62 +                         {}",
[INFO] [stdout] 63 +                                                 name,
[INFO] [stdout] 64 +                                                 funcs
[INFO] [stdout] 65 +                                                     .keys()
[INFO] [stdout] 66 +                                                     .map(|k| format!("\t{}", k))
[INFO] [stdout] 67 +                                                     .collect::<Vec<_>>()
[INFO] [stdout] 68 +                                                     .join("\n")
[INFO] [stdout] 69 +                                             );
[INFO] [stdout] 70 +                         Err(())
[INFO] [stdout] 71 ~                     };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/fun/linkedlist.rs:67:25
[INFO] [stdout]    |
[INFO] [stdout] 67 |             None => Err(String::from(format!("{:?} not found in linked list", val))),
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{:?} not found in linked list", val)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout]    = note: `#[warn(clippy::useless_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/main.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |                       return Err(println!(
[INFO] [stdout]    |  ____________________________^
[INFO] [stdout] 77 | |                         "Unknown category '{}'.
[INFO] [stdout] 78 | | Valid Categories:
[INFO] [stdout] 79 | | {}",
[INFO] [stdout] ...  |
[INFO] [stdout] 85 | |                             .join("\n")
[INFO] [stdout] 86 | |                     ));
[INFO] [stdout]    | |______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 76 ~                     return {
[INFO] [stdout] 77 +                         println!(
[INFO] [stdout] 78 +                                                 "Unknown category '{}'.
[INFO] [stdout] 79 +                         Valid Categories:
[INFO] [stdout] 80 +                         {}",
[INFO] [stdout] 81 +                                                 category,
[INFO] [stdout] 82 +                                                 categories
[INFO] [stdout] 83 +                                                     .keys()
[INFO] [stdout] 84 +                                                     .map(|k| format!("\t{}", k))
[INFO] [stdout] 85 +                                                     .collect::<Vec<_>>()
[INFO] [stdout] 86 +                                                     .join("\n")
[INFO] [stdout] 87 +                                             );
[INFO] [stdout] 88 +                         Err(())
[INFO] [stdout] 89 ~                     };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]   --> src/fun/linkedlist.rs:84:32
[INFO] [stdout]    |
[INFO] [stdout] 84 |                     return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::env::Args`
[INFO] [stdout]   --> src/main.rs:96:16
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let args = args().into_iter().skip(1);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `args()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: stripping a prefix manually
[INFO] [stdout]    --> src/main.rs:105:22
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Category(s[2..].into())
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the prefix was tested here
[INFO] [stdout]    --> src/main.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |         } else if s.starts_with("-c") {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_strip
[INFO] [stdout]     = note: `#[warn(clippy::manual_strip)]` on by default
[INFO] [stdout] help: try using the `strip_prefix` method
[INFO] [stdout]     |
[INFO] [stdout] 104 ~         } else if let Some(<stripped>) = s.strip_prefix("-c") {
[INFO] [stdout] 105 ~             Category(<stripped>.into())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/fun/linkedlist.rs:120:9
[INFO] [stdout]     |
[INFO] [stdout] 120 |         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]     = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 120 -         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout] 120 +         Err(String::from(format!("{} out of bounds.", idx)))
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/fun/linkedlist.rs:115:32
[INFO] [stdout]     |
[INFO] [stdout] 115 |                     return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::string::String`
[INFO] [stdout]    --> src/fun/linkedlist.rs:120:20
[INFO] [stdout]     |
[INFO] [stdout] 120 |         return Err(String::from(format!("{} out of bounds.", idx)));
[INFO] [stdout]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("{} out of bounds.", idx)`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:12:11
[INFO] [stdout]    |
[INFO] [stdout] 12 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]    = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:12:37
[INFO] [stdout]    |
[INFO] [stdout] 12 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:21:11
[INFO] [stdout]    |
[INFO] [stdout] 21 |     while !left.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:24:11
[INFO] [stdout]    |
[INFO] [stdout] 24 |     while !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:42:11
[INFO] [stdout]    |
[INFO] [stdout] 42 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:42:37
[INFO] [stdout]    |
[INFO] [stdout] 42 |     while !left.peek().is_none() && !right.peek().is_none() {
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:51:11
[INFO] [stdout]    |
[INFO] [stdout] 51 |     while !left.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: try: `left.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/fun/mergesort.rs:54:11
[INFO] [stdout]    |
[INFO] [stdout] 54 |     while !right.peek().is_none() {
[INFO] [stdout]    |           ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `right.peek().is_some()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stdout]   --> src/fun/dictreq.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 | /         if self.vals.contains_key(&key) {
[INFO] [stdout] 37 | |             self.vals.insert(key, val);
[INFO] [stdout] 38 | |             return Ok(());
[INFO] [stdout] 39 | |         } else if let Some(ref enclosing) = self.enclosing {
[INFO] [stdout] 40 | |             return enclosing.borrow_mut().assign(key, val);
[INFO] [stdout] 41 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider using the `Entry` API: https://doc.rust-lang.org/std/collections/struct.HashMap.html#entry-api
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stdout]    = note: `#[warn(clippy::map_entry)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/practice/invert_tree.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 11 |         return Box::new(tree);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 11 -         return Box::new(tree);
[INFO] [stdout] 11 +         Box::new(tree)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: binary comparison to literal `Option::None`
[INFO] [stdout]   --> src/practice/invert_tree.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if tree.left == None && tree.right == None {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `tree.left.is_none()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_to_none
[INFO] [stdout]    = note: `#[warn(clippy::partialeq_to_none)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: binary comparison to literal `Option::None`
[INFO] [stdout]   --> src/practice/invert_tree.rs:10:29
[INFO] [stdout]    |
[INFO] [stdout] 10 |     if tree.left == None && tree.right == None {
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^ help: use `Option::is_none()` instead: `tree.right.is_none()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#partialeq_to_none
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual implementation of `Option::map`
[INFO] [stdout]   --> src/practice/invert_tree.rs:15:19
[INFO] [stdout]    |
[INFO] [stdout] 15 |               left: match tree.right {
[INFO] [stdout]    |  ___________________^
[INFO] [stdout] 16 | |                 Some(t) => Some(invert_tree(*t)),
[INFO] [stdout] 17 | |                 None => None,
[INFO] [stdout] 18 | |             },
[INFO] [stdout]    | |_____________^ help: try: `tree.right.map(|t| invert_tree(*t))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_map
[INFO] [stdout]    = note: `#[warn(clippy::manual_map)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual implementation of `Option::map`
[INFO] [stdout]   --> src/practice/invert_tree.rs:19:20
[INFO] [stdout]    |
[INFO] [stdout] 19 |               right: match tree.left {
[INFO] [stdout]    |  ____________________^
[INFO] [stdout] 20 | |                 Some(t) => Some(invert_tree(*t)),
[INFO] [stdout] 21 | |                 None => None,
[INFO] [stdout] 22 | |             },
[INFO] [stdout]    | |_____________^ help: try: `tree.left.map(|t| invert_tree(*t))`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_map
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.zip()` with a range and `.len()`
[INFO] [stdout]  --> src/practice/twosum.rs:3:21
[INFO] [stdout]   |
[INFO] [stdout] 3 |     for (i, idx) in nums.iter().zip(0..nums.len()) {
[INFO] [stdout]   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_zip_with_len
[INFO] [stdout]   = note: `#[warn(clippy::range_zip_with_len)]` on by default
[INFO] [stdout] help: use
[INFO] [stdout]   |
[INFO] [stdout] 3 -     for (i, idx) in nums.iter().zip(0..nums.len()) {
[INFO] [stdout] 3 +     for (idx, i) in nums.iter().enumerate() {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: literal with an empty format string
[INFO] [stdout]   --> src/snippets.rs:37:13
[INFO] [stdout]    |
[INFO] [stdout] 37 |             "{5: {6: {7, 8}, 7}}",
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_literal
[INFO] [stdout]    = note: `#[warn(clippy::print_literal)]` on by default
[INFO] [stdout] help: try
[INFO] [stdout]    |
[INFO] [stdout] 36 -             "Invert_Tree({}) {:?}",
[INFO] [stdout] 37 -             "{5: {6: {7, 8}, 7}}",
[INFO] [stdout] 36 +             "Invert_Tree({{5: {{6: {{7, 8}}, 7}}}}) {:?}",
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `print!()` with a format string that ends in a single newline
[INFO] [stdout]   --> src/snippets.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |         print!("]\n");
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stdout]    = note: `#[warn(clippy::print_with_newline)]` on by default
[INFO] [stdout] help: use `println!` instead
[INFO] [stdout]    |
[INFO] [stdout] 84 -         print!("]\n");
[INFO] [stdout] 84 +         println!("]");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `print!()` with a format string that ends in a single newline
[INFO] [stdout]   --> src/snippets.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         print!("]\n");
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#print_with_newline
[INFO] [stdout] help: use `println!` instead
[INFO] [stdout]    |
[INFO] [stdout] 95 -         print!("]\n");
[INFO] [stdout] 95 +         println!("]");
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]    --> src/snippets.rs:125:9
[INFO] [stdout]     |
[INFO] [stdout] 125 | /         match env.assign("null".into(), 7) {
[INFO] [stdout] 126 | |             Err(()) => println!("null is undef"),
[INFO] [stdout] 127 | |             Ok(()) => {}
[INFO] [stdout] 128 | |         }
[INFO] [stdout]     | |_________^ help: try: `if let Err(()) = env.assign("null".into(), 7) { println!("null is undef") }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]     = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]    --> src/snippets.rs:144:9
[INFO] [stdout]     |
[INFO] [stdout] 144 | /         match counter.incr() {
[INFO] [stdout] 145 | |             Ok(_) => {}
[INFO] [stdout] 146 | |             Err(_) => {}
[INFO] [stdout] 147 | |         }
[INFO] [stdout]     | |_________^ help: try: `if let Ok(_) = counter.incr() {}`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/main.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     if args.len() == 0 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `args.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/main.rs:58:28
[INFO] [stdout]    |
[INFO] [stdout] 58 |                       return Err(println!(
[INFO] [stdout]    |  ____________________________^
[INFO] [stdout] 59 | |                         "Unknown snippet '{}'.
[INFO] [stdout] 60 | | Valid Snippets:
[INFO] [stdout] 61 | | {}",
[INFO] [stdout] ...  |
[INFO] [stdout] 67 | |                             .join("\n")
[INFO] [stdout] 68 | |                     ));
[INFO] [stdout]    | |______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout]    = note: `#[warn(clippy::unit_arg)]` on by default
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 58 ~                     return {
[INFO] [stdout] 59 +                         println!(
[INFO] [stdout] 60 +                                                 "Unknown snippet '{}'.
[INFO] [stdout] 61 +                         Valid Snippets:
[INFO] [stdout] 62 +                         {}",
[INFO] [stdout] 63 +                                                 name,
[INFO] [stdout] 64 +                                                 funcs
[INFO] [stdout] 65 +                                                     .keys()
[INFO] [stdout] 66 +                                                     .map(|k| format!("\t{}", k))
[INFO] [stdout] 67 +                                                     .collect::<Vec<_>>()
[INFO] [stdout] 68 +                                                     .join("\n")
[INFO] [stdout] 69 +                                             );
[INFO] [stdout] 70 +                         Err(())
[INFO] [stdout] 71 ~                     };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/main.rs:76:28
[INFO] [stdout]    |
[INFO] [stdout] 76 |                       return Err(println!(
[INFO] [stdout]    |  ____________________________^
[INFO] [stdout] 77 | |                         "Unknown category '{}'.
[INFO] [stdout] 78 | | Valid Categories:
[INFO] [stdout] 79 | | {}",
[INFO] [stdout] ...  |
[INFO] [stdout] 85 | |                             .join("\n")
[INFO] [stdout] 86 | |                     ));
[INFO] [stdout]    | |______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 76 ~                     return {
[INFO] [stdout] 77 +                         println!(
[INFO] [stdout] 78 +                                                 "Unknown category '{}'.
[INFO] [stdout] 79 +                         Valid Categories:
[INFO] [stdout] 80 +                         {}",
[INFO] [stdout] 81 +                                                 category,
[INFO] [stdout] 82 +                                                 categories
[INFO] [stdout] 83 +                                                     .keys()
[INFO] [stdout] 84 +                                                     .map(|k| format!("\t{}", k))
[INFO] [stdout] 85 +                                                     .collect::<Vec<_>>()
[INFO] [stdout] 86 +                                                     .join("\n")
[INFO] [stdout] 87 +                                             );
[INFO] [stdout] 88 +                         Err(())
[INFO] [stdout] 89 ~                     };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless conversion to the same type: `std::env::Args`
[INFO] [stdout]   --> src/main.rs:96:16
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let args = args().into_iter().skip(1);
[INFO] [stdout]    |                ^^^^^^^^^^^^^^^^^^ help: consider removing `.into_iter()`: `args()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_conversion
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: stripping a prefix manually
[INFO] [stdout]    --> src/main.rs:105:22
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Category(s[2..].into())
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the prefix was tested here
[INFO] [stdout]    --> src/main.rs:104:16
[INFO] [stdout]     |
[INFO] [stdout] 104 |         } else if s.starts_with("-c") {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_strip
[INFO] [stdout]     = note: `#[warn(clippy::manual_strip)]` on by default
[INFO] [stdout] help: try using the `strip_prefix` method
[INFO] [stdout]     |
[INFO] [stdout] 104 ~         } else if let Some(<stripped>) = s.strip_prefix("-c") {
[INFO] [stdout] 105 ~             Category(<stripped>.into())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.65s
[INFO] running `Command { std: "docker" "inspect" "b8cb309e3a8fe5422903594699db766599f0df39e2f415d30cce2d72e771cd62", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8cb309e3a8fe5422903594699db766599f0df39e2f415d30cce2d72e771cd62", kill_on_drop: false }`
[INFO] [stdout] b8cb309e3a8fe5422903594699db766599f0df39e2f415d30cce2d72e771cd62