[INFO] updating cached repository VoxWave/Compilers2018
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/VoxWave/Compilers2018
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/VoxWave/Compilers2018" "work/ex/clippy-test-run/sources/stable/gh/VoxWave/Compilers2018"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/VoxWave/Compilers2018'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/VoxWave/Compilers2018" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/VoxWave/Compilers2018"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/VoxWave/Compilers2018'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ba4fcdaabdef34f3da20321a7a9e49d6556eb676
[INFO] sha for GitHub repo VoxWave/Compilers2018: ba4fcdaabdef34f3da20321a7a9e49d6556eb676
[INFO] validating manifest of VoxWave/Compilers2018 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 VoxWave/Compilers2018 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 VoxWave/Compilers2018
[INFO] finished frobbing VoxWave/Compilers2018
[INFO] frobbed toml for VoxWave/Compilers2018 written to work/ex/clippy-test-run/sources/stable/gh/VoxWave/Compilers2018/Cargo.toml
[INFO] started frobbing VoxWave/Compilers2018
[INFO] finished frobbing VoxWave/Compilers2018
[INFO] frobbed toml for VoxWave/Compilers2018 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/VoxWave/Compilers2018/Cargo.toml
[INFO] crate VoxWave/Compilers2018 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 VoxWave/Compilers2018 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/VoxWave/Compilers2018:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] fc174c81839ea207a33d7e9f6265063b5f98ae7584e53d27e0287865345c1b66
[INFO] running `"docker" "start" "-a" "fc174c81839ea207a33d7e9f6265063b5f98ae7584e53d27e0287865345c1b66"`
[INFO] [stderr]     Checking char_stream v0.1.8
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.43
[INFO] [stderr]     Checking rayon-core v1.4.0
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking num v0.1.42
[INFO] [stderr]     Checking minipl-compiler v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::sync::mpsc::Sender`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::sync::mpsc::Sender;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::Receiver`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::sync::mpsc::Receiver;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::abort`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::process::abort;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/parser/mod.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 _ => panic!("unexpected Token {:#?} read during", t),
[INFO] [stderr]     |                 ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/interpreter.rs:207:33
[INFO] [stderr]     |
[INFO] [stderr] 207 |                     Value::Bool(b) => panic!("boolean printing is not supported"),
[INFO] [stderr]     |                                 ^ help: consider using `_b` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:27
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let (mut kill_switch, mut kill_signal) = channel();
[INFO] [stderr]    |                           ----^^^^^^^^^^^
[INFO] [stderr]    |                           |
[INFO] [stderr]    |                           help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:10
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let (mut kill_switch, mut kill_signal) = channel();
[INFO] [stderr]    |          ----^^^^^^^^^^^
[INFO] [stderr]    |          |
[INFO] [stderr]    |          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::Sender`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::sync::mpsc::Sender;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::mpsc::Receiver`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::sync::mpsc::Receiver;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::process::abort`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::process::abort;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/file_handling.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | /     match file.read_to_string(&mut source_text) {
[INFO] [stderr] 37 | |         Err(why) => panic!("couldn't read {}: {}", display, Error::description(&why)),
[INFO] [stderr] 38 | |         Ok(_) => {}
[INFO] [stderr] 39 | |     }
[INFO] [stderr]    | |_____^ help: try this: `if let Err(why) = file.read_to_string(&mut source_text) { panic!("couldn't read {}: {}", display, Error::description(&why)) }`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `scanner::Scanner`
[INFO] [stderr]    --> src/scanner/mod.rs:102:5
[INFO] [stderr]     |
[INFO] [stderr] 102 | /     pub fn new() -> Self {
[INFO] [stderr] 103 | |         Scanner {
[INFO] [stderr] 104 | |             tokens: VecDeque::new(),
[INFO] [stderr] 105 | |             scan_mode: ScanMode::Normal,
[INFO] [stderr] ...   |
[INFO] [stderr] 109 | |         }
[INFO] [stderr] 110 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::new_without_default)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 100 | impl Default for scanner::Scanner {
[INFO] [stderr] 101 |     fn default() -> Self {
[INFO] [stderr] 102 |         Self::new()
[INFO] [stderr] 103 |     }
[INFO] [stderr] 104 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/parser/mod.rs:237:37
[INFO] [stderr]     |
[INFO] [stderr] 237 |                       let statement = match &self.buffer[0] {
[INFO] [stderr]     |  _____________________________________^
[INFO] [stderr] 238 | |                         &Token::Identifier(ref identifier) => {
[INFO] [stderr] 239 | |                             Statement::Assignment(
[INFO] [stderr] 240 | |                                     identifier.clone(),
[INFO] [stderr] ...   |
[INFO] [stderr] 246 | |                         ),
[INFO] [stderr] 247 | |                     };
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 237 |                     let statement = match self.buffer[0] {
[INFO] [stderr] 238 |                         Token::Identifier(ref identifier) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:269:29
[INFO] [stderr]     |
[INFO] [stderr] 269 |                 _ => panic!("Expected keyword 'in', found {:#?}"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::panic_params)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/parser/mod.rs:337:20
[INFO] [stderr]     |
[INFO] [stderr] 337 |                 if 0 < self.buffer.len() {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!self.buffer.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/parser/mod.rs:449:92
[INFO] [stderr]     |
[INFO] [stderr] 449 |                             let operand2 = Operand::Expr(Box::new(parse_expression(&tokens[opening_index..(closing_index_2+1)])));
[INFO] [stderr]     |                                                                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `opening_index..=closing_index_2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:477:29
[INFO] [stderr]     |
[INFO] [stderr] 477 |                 _ => panic!("expression started with and invalid token {:#?}"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:489:21
[INFO] [stderr]     |
[INFO] [stderr] 489 |         _ => panic!("expected an operand but found a {:#?} instead"),
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:512:21
[INFO] [stderr]     |
[INFO] [stderr] 512 |         _ => panic!("expected an operator but found {:#?} instead"),
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/parser/mod.rs:520:18
[INFO] [stderr]     |
[INFO] [stderr] 520 |               0 => match t {
[INFO] [stderr]     |  __________________^
[INFO] [stderr] 521 | |                 &Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 522 | |                 _ => panic!("the first token was a {:#?} instead of an opening bracket"),
[INFO] [stderr] 523 | |             },
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 520 |             0 => match *t {
[INFO] [stderr] 521 |                 Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:522:29
[INFO] [stderr]     |
[INFO] [stderr] 522 |                 _ => panic!("the first token was a {:#?} instead of an opening bracket"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/parser/mod.rs:524:18
[INFO] [stderr]     |
[INFO] [stderr] 524 |               _ => match t {
[INFO] [stderr]     |  __________________^
[INFO] [stderr] 525 | |                 &Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 526 | |                 &Token::Bracket(Direction::Right) => {
[INFO] [stderr] 527 | |                     opened_brackets -= 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 532 | |                 _ => {}
[INFO] [stderr] 533 | |             },
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 524 |             _ => match *t {
[INFO] [stderr] 525 |                 Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 526 |                 Token::Bracket(Direction::Right) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `interpreter::Interpreter`
[INFO] [stderr]   --> src/interpreter.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 | /     pub fn new() -> Self {
[INFO] [stderr] 51 | |         Interpreter {
[INFO] [stderr] 52 | |             context: HashMap::new(),
[INFO] [stderr] 53 | |         }
[INFO] [stderr] 54 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: use of `expect` followed by a function call
[INFO] [stderr]    --> src/interpreter.rs:112:18
[INFO] [stderr]     |
[INFO] [stderr] 112 |                 .expect(&format!("undefined variable {}", iden))
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("undefined variable {}", iden))`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::expect_fun_call)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/interpreter.rs:131:33
[INFO] [stderr]     |
[INFO] [stderr] 131 |                     _ => panic!("{:#?} did not evaluate to a boolean"),
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter.rs:165:21
[INFO] [stderr]     |
[INFO] [stderr] 165 | /                     if self.context.contains_key(&var) {
[INFO] [stderr] 166 | |                         panic!("Tried to initialize a variable that was already initialized");
[INFO] [stderr] 167 | |                     } else {
[INFO] [stderr] 168 | |                         self.context.insert(var, Mutable(value));
[INFO] [stderr] 169 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using: `self.context.entry(var)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         kill_switch.send(true);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     kill_signal.recv();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable pattern
[INFO] [stderr]    --> src/parser/mod.rs:255:17
[INFO] [stderr]     |
[INFO] [stderr] 255 |                 _ => panic!("unexpected Token {:#?} read during", t),
[INFO] [stderr]     |                 ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_patterns)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/interpreter.rs:207:33
[INFO] [stderr]     |
[INFO] [stderr] 207 |                     Value::Bool(b) => panic!("boolean printing is not supported"),
[INFO] [stderr]     |                                 ^ help: consider using `_b` instead
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:27
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let (mut kill_switch, mut kill_signal) = channel();
[INFO] [stderr]    |                           ----^^^^^^^^^^^
[INFO] [stderr]    |                           |
[INFO] [stderr]    |                           help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:29:10
[INFO] [stderr]    |
[INFO] [stderr] 29 |     let (mut kill_switch, mut kill_signal) = channel();
[INFO] [stderr]    |          ----^^^^^^^^^^^
[INFO] [stderr]    |          |
[INFO] [stderr]    |          help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/parser/test.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 |     let mut expected: VecDeque<_> = vec![
[INFO] [stderr]    |         ----^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]   --> src/file_handling.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 | /     match file.read_to_string(&mut source_text) {
[INFO] [stderr] 37 | |         Err(why) => panic!("couldn't read {}: {}", display, Error::description(&why)),
[INFO] [stderr] 38 | |         Ok(_) => {}
[INFO] [stderr] 39 | |     }
[INFO] [stderr]    | |_____^ help: try this: `if let Err(why) = file.read_to_string(&mut source_text) { panic!("couldn't read {}: {}", display, Error::description(&why)) }`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::single_match)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `scanner::Scanner`
[INFO] [stderr]    --> src/scanner/mod.rs:102:5
[INFO] [stderr]     |
[INFO] [stderr] 102 | /     pub fn new() -> Self {
[INFO] [stderr] 103 | |         Scanner {
[INFO] [stderr] 104 | |             tokens: VecDeque::new(),
[INFO] [stderr] 105 | |             scan_mode: ScanMode::Normal,
[INFO] [stderr] ...   |
[INFO] [stderr] 109 | |         }
[INFO] [stderr] 110 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::new_without_default)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stderr] help: try this
[INFO] [stderr]     |
[INFO] [stderr] 100 | impl Default for scanner::Scanner {
[INFO] [stderr] 101 |     fn default() -> Self {
[INFO] [stderr] 102 |         Self::new()
[INFO] [stderr] 103 |     }
[INFO] [stderr] 104 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/parser/mod.rs:237:37
[INFO] [stderr]     |
[INFO] [stderr] 237 |                       let statement = match &self.buffer[0] {
[INFO] [stderr]     |  _____________________________________^
[INFO] [stderr] 238 | |                         &Token::Identifier(ref identifier) => {
[INFO] [stderr] 239 | |                             Statement::Assignment(
[INFO] [stderr] 240 | |                                     identifier.clone(),
[INFO] [stderr] ...   |
[INFO] [stderr] 246 | |                         ),
[INFO] [stderr] 247 | |                     };
[INFO] [stderr]     | |_____________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 237 |                     let statement = match self.buffer[0] {
[INFO] [stderr] 238 |                         Token::Identifier(ref identifier) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:269:29
[INFO] [stderr]     |
[INFO] [stderr] 269 |                 _ => panic!("Expected keyword 'in', found {:#?}"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::panic_params)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]    --> src/parser/mod.rs:337:20
[INFO] [stderr]     |
[INFO] [stderr] 337 |                 if 0 < self.buffer.len() {
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!self.buffer.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::len_zero)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] warning: an inclusive range would be more readable
[INFO] [stderr]    --> src/parser/mod.rs:449:92
[INFO] [stderr]     |
[INFO] [stderr] 449 |                             let operand2 = Operand::Expr(Box::new(parse_expression(&tokens[opening_index..(closing_index_2+1)])));
[INFO] [stderr]     |                                                                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `opening_index..=closing_index_2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::range_plus_one)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#range_plus_one
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:477:29
[INFO] [stderr]     |
[INFO] [stderr] 477 |                 _ => panic!("expression started with and invalid token {:#?}"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:489:21
[INFO] [stderr]     |
[INFO] [stderr] 489 |         _ => panic!("expected an operand but found a {:#?} instead"),
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:512:21
[INFO] [stderr]     |
[INFO] [stderr] 512 |         _ => panic!("expected an operator but found {:#?} instead"),
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/parser/mod.rs:520:18
[INFO] [stderr]     |
[INFO] [stderr] 520 |               0 => match t {
[INFO] [stderr]     |  __________________^
[INFO] [stderr] 521 | |                 &Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 522 | |                 _ => panic!("the first token was a {:#?} instead of an opening bracket"),
[INFO] [stderr] 523 | |             },
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 520 |             0 => match *t {
[INFO] [stderr] 521 |                 Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/parser/mod.rs:522:29
[INFO] [stderr]     |
[INFO] [stderr] 522 |                 _ => panic!("the first token was a {:#?} instead of an opening bracket"),
[INFO] [stderr]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/parser/mod.rs:524:18
[INFO] [stderr]     |
[INFO] [stderr] 524 |               _ => match t {
[INFO] [stderr]     |  __________________^
[INFO] [stderr] 525 | |                 &Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 526 | |                 &Token::Bracket(Direction::Right) => {
[INFO] [stderr] 527 | |                     opened_brackets -= 1;
[INFO] [stderr] ...   |
[INFO] [stderr] 532 | |                 _ => {}
[INFO] [stderr] 533 | |             },
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 524 |             _ => match *t {
[INFO] [stderr] 525 |                 Token::Bracket(Direction::Left) => opened_brackets += 1,
[INFO] [stderr] 526 |                 Token::Bracket(Direction::Right) => {
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider deriving a `Default` implementation for `interpreter::Interpreter`
[INFO] [stderr]   --> src/interpreter.rs:50:5
[INFO] [stderr]    |
[INFO] [stderr] 50 | /     pub fn new() -> Self {
[INFO] [stderr] 51 | |         Interpreter {
[INFO] [stderr] 52 | |             context: HashMap::new(),
[INFO] [stderr] 53 | |         }
[INFO] [stderr] 54 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::new_without_default_derive)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive
[INFO] [stderr] help: try this
[INFO] [stderr]    |
[INFO] [stderr] 45 | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: use of `expect` followed by a function call
[INFO] [stderr]    --> src/interpreter.rs:112:18
[INFO] [stderr]     |
[INFO] [stderr] 112 |                 .expect(&format!("undefined variable {}", iden))
[INFO] [stderr]     |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| panic!("undefined variable {}", iden))`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::expect_fun_call)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#expect_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: you probably are missing some parameter in your format string
[INFO] [stderr]    --> src/interpreter.rs:131:33
[INFO] [stderr]     |
[INFO] [stderr] 131 |                     _ => panic!("{:#?} did not evaluate to a boolean"),
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#panic_params
[INFO] [stderr] 
[INFO] [stderr] warning: usage of `contains_key` followed by `insert` on a `HashMap`
[INFO] [stderr]    --> src/interpreter.rs:165:21
[INFO] [stderr]     |
[INFO] [stderr] 165 | /                     if self.context.contains_key(&var) {
[INFO] [stderr] 166 | |                         panic!("Tried to initialize a variable that was already initialized");
[INFO] [stderr] 167 | |                     } else {
[INFO] [stderr] 168 | |                         self.context.insert(var, Mutable(value));
[INFO] [stderr] 169 | |                     }
[INFO] [stderr]     | |_____________________^ help: consider using: `self.context.entry(var)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_entry)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_entry
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:41:9
[INFO] [stderr]    |
[INFO] [stderr] 41 |         kill_switch.send(true);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:43:5
[INFO] [stderr]    |
[INFO] [stderr] 43 |     kill_signal.recv();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.57s
[INFO] running `"docker" "inspect" "fc174c81839ea207a33d7e9f6265063b5f98ae7584e53d27e0287865345c1b66"`
[INFO] running `"docker" "rm" "-f" "fc174c81839ea207a33d7e9f6265063b5f98ae7584e53d27e0287865345c1b66"`
[INFO] [stdout] fc174c81839ea207a33d7e9f6265063b5f98ae7584e53d27e0287865345c1b66