[INFO] updating cached repository tsuyoshiwada/rs-monkey-lang
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tsuyoshiwada/rs-monkey-lang
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tsuyoshiwada/rs-monkey-lang" "work/ex/clippy-test-run/sources/stable/gh/tsuyoshiwada/rs-monkey-lang"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/tsuyoshiwada/rs-monkey-lang'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tsuyoshiwada/rs-monkey-lang" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tsuyoshiwada/rs-monkey-lang"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tsuyoshiwada/rs-monkey-lang'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2189321538e58416708bea361b1c080a3f9c7c49
[INFO] sha for GitHub repo tsuyoshiwada/rs-monkey-lang: 2189321538e58416708bea361b1c080a3f9c7c49
[INFO] validating manifest of tsuyoshiwada/rs-monkey-lang 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 tsuyoshiwada/rs-monkey-lang 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 tsuyoshiwada/rs-monkey-lang
[INFO] finished frobbing tsuyoshiwada/rs-monkey-lang
[INFO] frobbed toml for tsuyoshiwada/rs-monkey-lang written to work/ex/clippy-test-run/sources/stable/gh/tsuyoshiwada/rs-monkey-lang/Cargo.toml
[INFO] started frobbing tsuyoshiwada/rs-monkey-lang
[INFO] finished frobbing tsuyoshiwada/rs-monkey-lang
[INFO] frobbed toml for tsuyoshiwada/rs-monkey-lang written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/tsuyoshiwada/rs-monkey-lang/Cargo.toml
[INFO] crate tsuyoshiwada/rs-monkey-lang 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 tsuyoshiwada/rs-monkey-lang against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-0/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/tsuyoshiwada/rs-monkey-lang:/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] 5ac7c4ab44e250b8f69ad96b3d2493262be3feeec4ee9251b432fa9a261518c6
[INFO] running `"docker" "start" "-a" "5ac7c4ab44e250b8f69ad96b3d2493262be3feeec4ee9251b432fa9a261518c6"`
[INFO] [stderr]     Checking monkey v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/formatter/mod.rs:38:14
[INFO] [stderr]    |
[INFO] [stderr] 38 |               &Expr::If {
[INFO] [stderr]    |  ______________^
[INFO] [stderr] 39 | |                 cond: _,
[INFO] [stderr] 40 | |                 consequence: _,
[INFO] [stderr] 41 | |                 alternative: _,
[INFO] [stderr] 42 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `If { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/formatter/mod.rs:43:16
[INFO] [stderr]    |
[INFO] [stderr] 43 |             | &Expr::Func { params: _, body: _ } => true,
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `Func { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/formatter/mod.rs:212:20
[INFO] [stderr]     |
[INFO] [stderr] 212 |               } else {
[INFO] [stderr]     |  ____________________^
[INFO] [stderr] 213 | |                 if i > 0 {
[INFO] [stderr] 214 | |                     result.push_str(&format!(", {}", expr_str));
[INFO] [stderr] 215 | |                 } else {
[INFO] [stderr] 216 | |                     result.push_str(&expr_str);
[INFO] [stderr] 217 | |                 }
[INFO] [stderr] 218 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 212 |             } else if i > 0 {
[INFO] [stderr] 213 |     result.push_str(&format!(", {}", expr_str));
[INFO] [stderr] 214 | } else {
[INFO] [stderr] 215 |     result.push_str(&expr_str);
[INFO] [stderr] 216 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         return lexer;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `lexer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |             return 0;
[INFO] [stderr]    |             ^^^^^^^^^ help: remove `return` as shown: `0`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:38:13
[INFO] [stderr]    |
[INFO] [stderr] 38 |             return self.input.as_bytes()[self.next_pos];
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.input.as_bytes()[self.next_pos]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/lexer/mod.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |         return tok;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: remove `return` as shown: `tok`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/parser/mod.rs:94:13
[INFO] [stderr]    |
[INFO] [stderr] 94 |             return true;
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/parser/mod.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |             return false;
[INFO] [stderr]    |             ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/formatter/mod.rs:38:14
[INFO] [stderr]    |
[INFO] [stderr] 38 |               &Expr::If {
[INFO] [stderr]    |  ______________^
[INFO] [stderr] 39 | |                 cond: _,
[INFO] [stderr] 40 | |                 consequence: _,
[INFO] [stderr] 41 | |                 alternative: _,
[INFO] [stderr] 42 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::unneeded_field_pattern)] on by default
[INFO] [stderr]    = help: Try with `If { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: All the struct fields are matched to a wildcard pattern, consider using `..`.
[INFO] [stderr]   --> src/formatter/mod.rs:43:16
[INFO] [stderr]    |
[INFO] [stderr] 43 |             | &Expr::Func { params: _, body: _ } => true,
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: Try with `Func { .. }` instead
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unneeded_field_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/formatter/mod.rs:212:20
[INFO] [stderr]     |
[INFO] [stderr] 212 |               } else {
[INFO] [stderr]     |  ____________________^
[INFO] [stderr] 213 | |                 if i > 0 {
[INFO] [stderr] 214 | |                     result.push_str(&format!(", {}", expr_str));
[INFO] [stderr] 215 | |                 } else {
[INFO] [stderr] 216 | |                     result.push_str(&expr_str);
[INFO] [stderr] 217 | |                 }
[INFO] [stderr] 218 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::collapsible_if)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#collapsible_if
[INFO] [stderr] help: try
[INFO] [stderr]     |
[INFO] [stderr] 212 |             } else if i > 0 {
[INFO] [stderr] 213 |     result.push_str(&format!(", {}", expr_str));
[INFO] [stderr] 214 | } else {
[INFO] [stderr] 215 |     result.push_str(&expr_str);
[INFO] [stderr] 216 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 |         return lexer;
[INFO] [stderr]    |         ^^^^^^^^^^^^^ help: remove `return` as shown: `lexer`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |             return 0;
[INFO] [stderr]    |             ^^^^^^^^^ help: remove `return` as shown: `0`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lexer/mod.rs:38:13
[INFO] [stderr]    |
[INFO] [stderr] 38 |             return self.input.as_bytes()[self.next_pos];
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `self.input.as_bytes()[self.next_pos]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/lexer/mod.rs:131:9
[INFO] [stderr]     |
[INFO] [stderr] 131 |         return tok;
[INFO] [stderr]     |         ^^^^^^^^^^^ help: remove `return` as shown: `tok`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/parser/mod.rs:94:13
[INFO] [stderr]    |
[INFO] [stderr] 94 |             return true;
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: remove `return` as shown: `true`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/parser/mod.rs:97:13
[INFO] [stderr]    |
[INFO] [stderr] 97 |             return false;
[INFO] [stderr]    |             ^^^^^^^^^^^^^ help: remove `return` as shown: `false`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/parser/mod.rs:641:48
[INFO] [stderr]     |
[INFO] [stderr] 641 |                     Expr::Literal(Literal::Int(838383)),
[INFO] [stderr]     |                                                ^^^^^^ help: consider: `838_383`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unreadable_literal)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/parser/mod.rs:664:57
[INFO] [stderr]     |
[INFO] [stderr] 664 |                 Stmt::Return(Expr::Literal(Literal::Int(993322))),
[INFO] [stderr]     |                                                         ^^^^^^ help: consider: `993_322`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/evaluator/builtins.rs:46:32
[INFO] [stderr]    |
[INFO] [stderr] 46 |         Object::Array(o) => if o.len() > 0 {
[INFO] [stderr]    |                                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!o.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: you should consider deriving a `Default` implementation for `evaluator::env::Env`
[INFO] [stderr]   --> src/evaluator/env.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | /     pub fn new() -> Self {
[INFO] [stderr] 14 | |         Env {
[INFO] [stderr] 15 | |             store: HashMap::new(),
[INFO] [stderr] 16 | |             outer: None,
[INFO] [stderr] 17 | |         }
[INFO] [stderr] 18 | |     }
[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] 7  | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/evaluator/object.rs:57:42
[INFO] [stderr]    |
[INFO] [stderr] 57 |                         result.push_str(&format!("{}", s));
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `s.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]    = 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: you are implementing `Hash` explicitly but have derived `PartialEq`
[INFO] [stderr]   --> src/evaluator/object.rs:74:1
[INFO] [stderr]    |
[INFO] [stderr] 74 | / impl Hash for Object {
[INFO] [stderr] 75 | |     fn hash<H: Hasher>(&self, state: &mut H) {
[INFO] [stderr] 76 | |         match *self {
[INFO] [stderr] 77 | |             Object::Int(ref i) => i.hash(state),
[INFO] [stderr] ...  |
[INFO] [stderr] 82 | |     }
[INFO] [stderr] 83 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::derive_hash_xor_eq)] on by default
[INFO] [stderr] note: `PartialEq` implemented here
[INFO] [stderr]   --> src/evaluator/object.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[derive(PartialEq, Clone, Debug)]
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/evaluator/mod.rs:149:35
[INFO] [stderr]     |
[INFO] [stderr] 149 |             None => Object::Error(String::from(format!("identifier not found: {}", name))),
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("identifier not found: {}", name)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::identity_conversion)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/evaluator/mod.rs:250:32
[INFO] [stderr]     |
[INFO] [stderr] 250 |               _ => Object::Error(String::from(format!(
[INFO] [stderr]     |  ________________________________^
[INFO] [stderr] 251 | |                 "unknown operator: {} {} {}",
[INFO] [stderr] 252 | |                 left, infix, right
[INFO] [stderr] 253 | |             ))),
[INFO] [stderr]     | |______________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] help: consider removing `String::from()`
[INFO] [stderr]     |
[INFO] [stderr] 250 |             _ => Object::Error(format!(
[INFO] [stderr] 251 |                 "unknown operator: {} {} {}",
[INFO] [stderr] 252 |                 left, infix, right
[INFO] [stderr] 253 |             )),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/evaluator/mod.rs:316:34
[INFO] [stderr]     |
[INFO] [stderr] 316 |     fn eval_call_expr(&mut self, func: Box<Expr>, args: Vec<Expr>) -> Object {
[INFO] [stderr]     |                                  ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::boxed_local)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `formatter::Formatter`
[INFO] [stderr]   --> src/formatter/mod.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     pub fn new() -> Self {
[INFO] [stderr] 16 | |         Formatter {
[INFO] [stderr] 17 | |             indent: 0,
[INFO] [stderr] 18 | |             column: 1,
[INFO] [stderr] ...  |
[INFO] [stderr] 23 | |         }
[INFO] [stderr] 24 | |     }
[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] 14 | impl Default for formatter::Formatter {
[INFO] [stderr] 15 |     fn default() -> Self {
[INFO] [stderr] 16 |         Self::new()
[INFO] [stderr] 17 |     }
[INFO] [stderr] 18 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/formatter/mod.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 | /         match expr {
[INFO] [stderr] 38 | |             &Expr::If {
[INFO] [stderr] 39 | |                 cond: _,
[INFO] [stderr] 40 | |                 consequence: _,
[INFO] [stderr] ...  |
[INFO] [stderr] 44 | |             _ => false,
[INFO] [stderr] 45 | |         }
[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: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 37 |         match *expr {
[INFO] [stderr] 38 |             Expr::If {
[INFO] [stderr] 39 |                 cond: _,
[INFO] [stderr] 40 |                 consequence: _,
[INFO] [stderr] 41 |                 alternative: _,
[INFO] [stderr] 42 |             }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] error: this `if` has identical blocks
[INFO] [stderr]   --> src/formatter/mod.rs:66:69
[INFO] [stderr]    |
[INFO] [stderr] 66 |                   } else if i + 1 == stmts.len() && *x == Stmt::Blank {
[INFO] [stderr]    |  _____________________________________________________________________^
[INFO] [stderr] 67 | |                     None
[INFO] [stderr] 68 | |                 } else if i > 0 && *x == Stmt::Blank && stmts.get(i - 1) == Some(&Stmt::Blank) {
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::if_same_then_else)] on by default
[INFO] [stderr] note: same as this
[INFO] [stderr]   --> src/formatter/mod.rs:64:48
[INFO] [stderr]    |
[INFO] [stderr] 64 |                   if i == 0 && *x == Stmt::Blank {
[INFO] [stderr]    |  ________________________________________________^
[INFO] [stderr] 65 | |                     None
[INFO] [stderr] 66 | |                 } else if i + 1 == stmts.len() && *x == Stmt::Blank {
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#if_same_then_else
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/formatter/mod.rs:117:22
[INFO] [stderr]     |
[INFO] [stderr] 117 |         let result = String::from(format!("let {} = ", ident_str));
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("let {} = ", ident_str)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:287:9
[INFO] [stderr]     |
[INFO] [stderr] 287 |         right: Box<Expr>,
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:286:9
[INFO] [stderr]     |
[INFO] [stderr] 286 |         left: Box<Expr>,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:301:54
[INFO] [stderr]     |
[INFO] [stderr] 301 |     fn format_prefix_expr(&mut self, prefix: Prefix, right: Box<Expr>) -> String {
[INFO] [stderr]     |                                                      ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:307:54
[INFO] [stderr]     |
[INFO] [stderr] 307 |     fn format_index_expr(&mut self, left: Box<Expr>, index: Box<Expr>) -> String {
[INFO] [stderr]     |                                                      ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:307:37
[INFO] [stderr]     |
[INFO] [stderr] 307 |     fn format_index_expr(&mut self, left: Box<Expr>, index: Box<Expr>) -> String {
[INFO] [stderr]     |                                     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:316:9
[INFO] [stderr]     |
[INFO] [stderr] 316 |         cond: Box<Expr>,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:374:36
[INFO] [stderr]     |
[INFO] [stderr] 374 |     fn format_call_expr(&mut self, func: Box<Expr>, args: Vec<Expr>) -> String {
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/lexer/mod.rs:165:9
[INFO] [stderr]     |
[INFO] [stderr] 165 | /         loop {
[INFO] [stderr] 166 | |             match self.ch {
[INFO] [stderr] 167 | |                 b'0'...b'9' => {
[INFO] [stderr] 168 | |                     self.read_char();
[INFO] [stderr] ...   |
[INFO] [stderr] 173 | |             }
[INFO] [stderr] 174 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let b'0'...b'9' = self.ch { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[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/parser/mod.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 | /             match self.parse_stmt() {
[INFO] [stderr] 134 | |                 Some(stmt) => program.push(stmt),
[INFO] [stderr] 135 | |                 None => {}
[INFO] [stderr] 136 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(stmt) = self.parse_stmt() { program.push(stmt) }`
[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 seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/parser/mod.rs:149:13
[INFO] [stderr]     |
[INFO] [stderr] 149 | /             match self.parse_stmt() {
[INFO] [stderr] 150 | |                 Some(stmt) => block.push(stmt),
[INFO] [stderr] 151 | |                 None => {}
[INFO] [stderr] 152 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(stmt) = self.parse_stmt() { block.push(stmt) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/parser/mod.rs:290:72
[INFO] [stderr]     |
[INFO] [stderr] 290 |             Token::Int(ref mut int) => Some(Expr::Literal(Literal::Int(int.clone()))),
[INFO] [stderr]     |                                                                        ^^^^^^^^^^^ help: try dereferencing it: `*int`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: equality checks against true are unnecessary
[INFO] [stderr]    --> src/parser/mod.rs:304:68
[INFO] [stderr]     |
[INFO] [stderr] 304 |             Token::Bool(value) => Some(Expr::Literal(Literal::Bool(value == true))),
[INFO] [stderr]     |                                                                    ^^^^^^^^^^^^^ help: try simplifying it as shown: `value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::bool_comparison)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/parser/mod.rs:469:9
[INFO] [stderr]     |
[INFO] [stderr] 469 | /         let mut alternative = None;
[INFO] [stderr] 470 | |
[INFO] [stderr] 471 | |         if self.next_token_is(&Token::Else) {
[INFO] [stderr] 472 | |             self.bump();
[INFO] [stderr] ...   |
[INFO] [stderr] 478 | |             alternative = Some(self.parse_block_stmt());
[INFO] [stderr] 479 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> alternative = if self.next_token_is(&Token::Else) { ..; Some(self.parse_block_stmt()) } else { None };`
[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] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `monkey`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/evaluator/builtins.rs:46:32
[INFO] [stderr]    |
[INFO] [stderr] 46 |         Object::Array(o) => if o.len() > 0 {
[INFO] [stderr]    |                                ^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!o.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: you should consider deriving a `Default` implementation for `evaluator::env::Env`
[INFO] [stderr]   --> src/evaluator/env.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | /     pub fn new() -> Self {
[INFO] [stderr] 14 | |         Env {
[INFO] [stderr] 15 | |             store: HashMap::new(),
[INFO] [stderr] 16 | |             outer: None,
[INFO] [stderr] 17 | |         }
[INFO] [stderr] 18 | |     }
[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] 7  | #[derive(Default)]
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]   --> src/evaluator/object.rs:57:42
[INFO] [stderr]    |
[INFO] [stderr] 57 |                         result.push_str(&format!("{}", s));
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `s.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]    = 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: you are implementing `Hash` explicitly but have derived `PartialEq`
[INFO] [stderr]   --> src/evaluator/object.rs:74:1
[INFO] [stderr]    |
[INFO] [stderr] 74 | / impl Hash for Object {
[INFO] [stderr] 75 | |     fn hash<H: Hasher>(&self, state: &mut H) {
[INFO] [stderr] 76 | |         match *self {
[INFO] [stderr] 77 | |             Object::Int(ref i) => i.hash(state),
[INFO] [stderr] ...  |
[INFO] [stderr] 82 | |     }
[INFO] [stderr] 83 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::derive_hash_xor_eq)] on by default
[INFO] [stderr] note: `PartialEq` implemented here
[INFO] [stderr]   --> src/evaluator/object.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 | #[derive(PartialEq, Clone, Debug)]
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#derive_hash_xor_eq
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/evaluator/mod.rs:149:35
[INFO] [stderr]     |
[INFO] [stderr] 149 |             None => Object::Error(String::from(format!("identifier not found: {}", name))),
[INFO] [stderr]     |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("identifier not found: {}", name)`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::identity_conversion)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/evaluator/mod.rs:250:32
[INFO] [stderr]     |
[INFO] [stderr] 250 |               _ => Object::Error(String::from(format!(
[INFO] [stderr]     |  ________________________________^
[INFO] [stderr] 251 | |                 "unknown operator: {} {} {}",
[INFO] [stderr] 252 | |                 left, infix, right
[INFO] [stderr] 253 | |             ))),
[INFO] [stderr]     | |______________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] help: consider removing `String::from()`
[INFO] [stderr]     |
[INFO] [stderr] 250 |             _ => Object::Error(format!(
[INFO] [stderr] 251 |                 "unknown operator: {} {} {}",
[INFO] [stderr] 252 |                 left, infix, right
[INFO] [stderr] 253 |             )),
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/evaluator/mod.rs:316:34
[INFO] [stderr]     |
[INFO] [stderr] 316 |     fn eval_call_expr(&mut self, func: Box<Expr>, args: Vec<Expr>) -> Object {
[INFO] [stderr]     |                                  ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::boxed_local)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `formatter::Formatter`
[INFO] [stderr]   --> src/formatter/mod.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     pub fn new() -> Self {
[INFO] [stderr] 16 | |         Formatter {
[INFO] [stderr] 17 | |             indent: 0,
[INFO] [stderr] 18 | |             column: 1,
[INFO] [stderr] ...  |
[INFO] [stderr] 23 | |         }
[INFO] [stderr] 24 | |     }
[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] 14 | impl Default for formatter::Formatter {
[INFO] [stderr] 15 |     fn default() -> Self {
[INFO] [stderr] 16 |         Self::new()
[INFO] [stderr] 17 |     }
[INFO] [stderr] 18 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/formatter/mod.rs:37:9
[INFO] [stderr]    |
[INFO] [stderr] 37 | /         match expr {
[INFO] [stderr] 38 | |             &Expr::If {
[INFO] [stderr] 39 | |                 cond: _,
[INFO] [stderr] 40 | |                 consequence: _,
[INFO] [stderr] ...  |
[INFO] [stderr] 44 | |             _ => false,
[INFO] [stderr] 45 | |         }
[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: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 37 |         match *expr {
[INFO] [stderr] 38 |             Expr::If {
[INFO] [stderr] 39 |                 cond: _,
[INFO] [stderr] 40 |                 consequence: _,
[INFO] [stderr] 41 |                 alternative: _,
[INFO] [stderr] 42 |             }
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] error: this `if` has identical blocks
[INFO] [stderr]   --> src/formatter/mod.rs:66:69
[INFO] [stderr]    |
[INFO] [stderr] 66 |                   } else if i + 1 == stmts.len() && *x == Stmt::Blank {
[INFO] [stderr]    |  _____________________________________________________________________^
[INFO] [stderr] 67 | |                     None
[INFO] [stderr] 68 | |                 } else if i > 0 && *x == Stmt::Blank && stmts.get(i - 1) == Some(&Stmt::Blank) {
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[deny(clippy::if_same_then_else)] on by default
[INFO] [stderr] note: same as this
[INFO] [stderr]   --> src/formatter/mod.rs:64:48
[INFO] [stderr]    |
[INFO] [stderr] 64 |                   if i == 0 && *x == Stmt::Blank {
[INFO] [stderr]    |  ________________________________________________^
[INFO] [stderr] 65 | |                     None
[INFO] [stderr] 66 | |                 } else if i + 1 == stmts.len() && *x == Stmt::Blank {
[INFO] [stderr]    | |_________________^
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#if_same_then_else
[INFO] [stderr] 
[INFO] [stderr] warning: identical conversion
[INFO] [stderr]    --> src/formatter/mod.rs:117:22
[INFO] [stderr]     |
[INFO] [stderr] 117 |         let result = String::from(format!("let {} = ", ident_str));
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider removing `String::from()`: `format!("let {} = ", ident_str)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#identity_conversion
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:287:9
[INFO] [stderr]     |
[INFO] [stderr] 287 |         right: Box<Expr>,
[INFO] [stderr]     |         ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:286:9
[INFO] [stderr]     |
[INFO] [stderr] 286 |         left: Box<Expr>,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:301:54
[INFO] [stderr]     |
[INFO] [stderr] 301 |     fn format_prefix_expr(&mut self, prefix: Prefix, right: Box<Expr>) -> String {
[INFO] [stderr]     |                                                      ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:307:54
[INFO] [stderr]     |
[INFO] [stderr] 307 |     fn format_index_expr(&mut self, left: Box<Expr>, index: Box<Expr>) -> String {
[INFO] [stderr]     |                                                      ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:307:37
[INFO] [stderr]     |
[INFO] [stderr] 307 |     fn format_index_expr(&mut self, left: Box<Expr>, index: Box<Expr>) -> String {
[INFO] [stderr]     |                                     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:316:9
[INFO] [stderr]     |
[INFO] [stderr] 316 |         cond: Box<Expr>,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: local variable doesn't need to be boxed here
[INFO] [stderr]    --> src/formatter/mod.rs:374:36
[INFO] [stderr]     |
[INFO] [stderr] 374 |     fn format_call_expr(&mut self, func: Box<Expr>, args: Vec<Expr>) -> String {
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#boxed_local
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/lexer/mod.rs:165:9
[INFO] [stderr]     |
[INFO] [stderr] 165 | /         loop {
[INFO] [stderr] 166 | |             match self.ch {
[INFO] [stderr] 167 | |                 b'0'...b'9' => {
[INFO] [stderr] 168 | |                     self.read_char();
[INFO] [stderr] ...   |
[INFO] [stderr] 173 | |             }
[INFO] [stderr] 174 | |         }
[INFO] [stderr]     | |_________^ help: try: `while let b'0'...b'9' = self.ch { .. }`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::while_let_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#while_let_loop
[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/parser/mod.rs:133:13
[INFO] [stderr]     |
[INFO] [stderr] 133 | /             match self.parse_stmt() {
[INFO] [stderr] 134 | |                 Some(stmt) => program.push(stmt),
[INFO] [stderr] 135 | |                 None => {}
[INFO] [stderr] 136 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(stmt) = self.parse_stmt() { program.push(stmt) }`
[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 seem to be trying to use match for destructuring a single pattern. Consider using `if let`
[INFO] [stderr]    --> src/parser/mod.rs:149:13
[INFO] [stderr]     |
[INFO] [stderr] 149 | /             match self.parse_stmt() {
[INFO] [stderr] 150 | |                 Some(stmt) => block.push(stmt),
[INFO] [stderr] 151 | |                 None => {}
[INFO] [stderr] 152 | |             }
[INFO] [stderr]     | |_____________^ help: try this: `if let Some(stmt) = self.parse_stmt() { block.push(stmt) }`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]    --> src/parser/mod.rs:290:72
[INFO] [stderr]     |
[INFO] [stderr] 290 |             Token::Int(ref mut int) => Some(Expr::Literal(Literal::Int(int.clone()))),
[INFO] [stderr]     |                                                                        ^^^^^^^^^^^ help: try dereferencing it: `*int`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] warning: equality checks against true are unnecessary
[INFO] [stderr]    --> src/parser/mod.rs:304:68
[INFO] [stderr]     |
[INFO] [stderr] 304 |             Token::Bool(value) => Some(Expr::Literal(Literal::Bool(value == true))),
[INFO] [stderr]     |                                                                    ^^^^^^^^^^^^^ help: try simplifying it as shown: `value`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::bool_comparison)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#bool_comparison
[INFO] [stderr] 
[INFO] [stderr] warning: `if _ { .. } else { .. }` is an expression
[INFO] [stderr]    --> src/parser/mod.rs:469:9
[INFO] [stderr]     |
[INFO] [stderr] 469 | /         let mut alternative = None;
[INFO] [stderr] 470 | |
[INFO] [stderr] 471 | |         if self.next_token_is(&Token::Else) {
[INFO] [stderr] 472 | |             self.bump();
[INFO] [stderr] ...   |
[INFO] [stderr] 478 | |             alternative = Some(self.parse_block_stmt());
[INFO] [stderr] 479 | |         }
[INFO] [stderr]     | |_________^ help: it is more idiomatic to write: `let <mut> alternative = if self.next_token_is(&Token::Else) { ..; Some(self.parse_block_stmt()) } else { None };`
[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: length comparison to zero
[INFO] [stderr]    --> src/parser/mod.rs:562:12
[INFO] [stderr]     |
[INFO] [stderr] 562 |         if errors.len() == 0 {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `errors.is_empty()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `monkey`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "5ac7c4ab44e250b8f69ad96b3d2493262be3feeec4ee9251b432fa9a261518c6"`
[INFO] running `"docker" "rm" "-f" "5ac7c4ab44e250b8f69ad96b3d2493262be3feeec4ee9251b432fa9a261518c6"`
[INFO] [stdout] 5ac7c4ab44e250b8f69ad96b3d2493262be3feeec4ee9251b432fa9a261518c6