[INFO] updating cached repository jffjs/rlox
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jffjs/rlox
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jffjs/rlox" "work/ex/clippy-test-run/sources/stable/gh/jffjs/rlox"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/jffjs/rlox'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jffjs/rlox" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jffjs/rlox"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jffjs/rlox'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ecd5a906d7c5ae499ce8114e963d2fd5a80e89f9
[INFO] sha for GitHub repo jffjs/rlox: ecd5a906d7c5ae499ce8114e963d2fd5a80e89f9
[INFO] validating manifest of jffjs/rlox 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 jffjs/rlox 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 jffjs/rlox
[INFO] finished frobbing jffjs/rlox
[INFO] frobbed toml for jffjs/rlox written to work/ex/clippy-test-run/sources/stable/gh/jffjs/rlox/Cargo.toml
[INFO] started frobbing jffjs/rlox
[INFO] finished frobbing jffjs/rlox
[INFO] frobbed toml for jffjs/rlox written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jffjs/rlox/Cargo.toml
[INFO] crate jffjs/rlox 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 jffjs/rlox against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/jffjs/rlox:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dclippy::into_iter_on_array" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2498ce2501da4f14d650112393d7a7cad4bc3f9d02b5a45b71868b811d948fac
[INFO] running `"docker" "start" "-a" "2498ce2501da4f14d650112393d7a7cad4bc3f9d02b5a45b71868b811d948fac"`
[INFO] [stderr]     Checking rlox v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/parser.rs:136:16
[INFO] [stderr]     |
[INFO] [stderr] 136 |           } else {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 137 | |             if match_type(&tokens[pos], vec![TokenType::Semicolon]) {
[INFO] [stderr] 138 | |                 let stmt = ast::Stmt::var(name);
[INFO] [stderr] 139 | |                 StmtResult::Ok(stmt, pos + 1)
[INFO] [stderr] ...   |
[INFO] [stderr] 142 | |             }
[INFO] [stderr] 143 | |         }
[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] 136 |         } else if match_type(&tokens[pos], vec![TokenType::Semicolon]) {
[INFO] [stderr] 137 |     let stmt = ast::Stmt::var(name);
[INFO] [stderr] 138 |     StmtResult::Ok(stmt, pos + 1)
[INFO] [stderr] 139 | } else {
[INFO] [stderr] 140 |     StmtResult::Err("Expect ';' after variable declaration.", pos)
[INFO] [stderr] 141 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: Creating a reference that is immediately dereferenced.
[INFO] [stderr]    --> src/parser.rs:604:27
[INFO] [stderr]     |
[INFO] [stderr] 604 |                     match (&tokens[pos]).token_type {
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: try this: `tokens[pos].token_type`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ref_in_deref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ref_in_deref
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/eval.rs:166:9
[INFO] [stderr]     |
[INFO] [stderr] 166 |         result
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/eval.rs:160:22
[INFO] [stderr]     |
[INFO] [stderr] 160 |           let result = match self.declaration.body.execute(env) {
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 161 | |             Ok(Some(v)) => Ok(v),
[INFO] [stderr] 162 | |             Ok(None) => Ok(Value::Nil),
[INFO] [stderr] 163 | |             Err(err) => Err(err)
[INFO] [stderr] 164 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[INFO] [stderr] 
[INFO] [stderr] warning: this `else { if .. }` block can be collapsed
[INFO] [stderr]    --> src/parser.rs:136:16
[INFO] [stderr]     |
[INFO] [stderr] 136 |           } else {
[INFO] [stderr]     |  ________________^
[INFO] [stderr] 137 | |             if match_type(&tokens[pos], vec![TokenType::Semicolon]) {
[INFO] [stderr] 138 | |                 let stmt = ast::Stmt::var(name);
[INFO] [stderr] 139 | |                 StmtResult::Ok(stmt, pos + 1)
[INFO] [stderr] ...   |
[INFO] [stderr] 142 | |             }
[INFO] [stderr] 143 | |         }
[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] 136 |         } else if match_type(&tokens[pos], vec![TokenType::Semicolon]) {
[INFO] [stderr] 137 |     let stmt = ast::Stmt::var(name);
[INFO] [stderr] 138 |     StmtResult::Ok(stmt, pos + 1)
[INFO] [stderr] 139 | } else {
[INFO] [stderr] 140 |     StmtResult::Err("Expect ';' after variable declaration.", pos)
[INFO] [stderr] 141 | }
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: Creating a reference that is immediately dereferenced.
[INFO] [stderr]    --> src/parser.rs:604:27
[INFO] [stderr]     |
[INFO] [stderr] 604 |                     match (&tokens[pos]).token_type {
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^ help: try this: `tokens[pos].token_type`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ref_in_deref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ref_in_deref
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]    --> src/eval.rs:166:9
[INFO] [stderr]     |
[INFO] [stderr] 166 |         result
[INFO] [stderr]     |         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::let_and_return)] on by default
[INFO] [stderr] note: this expression can be directly returned
[INFO] [stderr]    --> src/eval.rs:160:22
[INFO] [stderr]     |
[INFO] [stderr] 160 |           let result = match self.declaration.body.execute(env) {
[INFO] [stderr]     |  ______________________^
[INFO] [stderr] 161 | |             Ok(Some(v)) => Ok(v),
[INFO] [stderr] 162 | |             Ok(None) => Ok(Value::Nil),
[INFO] [stderr] 163 | |             Err(err) => Err(err)
[INFO] [stderr] 164 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_and_return
[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/scanner.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 | /             match self.scan_token() {
[INFO] [stderr] 73 | |                 Err(e) => errors.push(e),
[INFO] [stderr] 74 | |                 _ => ()
[INFO] [stderr] 75 | |             }
[INFO] [stderr]    | |_____________^ help: try this: `if let Err(e) = self.scan_token() { errors.push(e) }`
[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: length comparison to zero
[INFO] [stderr]   --> src/scanner.rs:85:12
[INFO] [stderr]    |
[INFO] [stderr] 85 |         if errors.len() > 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!errors.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: manual implementation of an assign operation
[INFO] [stderr]    --> src/scanner.rs:276:9
[INFO] [stderr]     |
[INFO] [stderr] 276 |         self.current = self.current + 1
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.current += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/scanner.rs:280:9
[INFO] [stderr]     |
[INFO] [stderr] 280 |         self.line = self.line + 1
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.line += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/scanner.rs:284:14
[INFO] [stderr]     |
[INFO] [stderr] 284 | fn substr(s: &String, start: usize, end: usize) -> String {
[INFO] [stderr]     |              ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:17:22
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn parse(tokens: &Vec<Token>) -> Result<Vec<ast::Stmt>, Vec<Box<Error>>> {
[INFO] [stderr]    |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/parser.rs:59:8
[INFO] [stderr]    |
[INFO] [stderr] 59 |     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] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:66:24
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn declaration(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]    |                        ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:74:32
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn fun_declaration<'a>(tokens: &'a Vec<Token>, mut pos: usize) -> StmtResult<'a> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/parser.rs:96:53
[INFO] [stderr]    |
[INFO] [stderr] 96 |                                 TokenType::Comma => pos = pos + 1,
[INFO] [stderr]    |                                                     ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:120:28
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn var_declaration(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:149:22
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:161:25
[INFO] [stderr]     |
[INFO] [stderr] 161 | fn if_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                         ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:184:26
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn for_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                          ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:199:17
[INFO] [stderr]     |
[INFO] [stderr] 199 |                 pos = pos + 2;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^ help: replace it with: `pos += 2`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:213:41
[INFO] [stderr]     |
[INFO] [stderr] 213 |                 TokenType::Semicolon => pos = pos + 1,
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:228:42
[INFO] [stderr]     |
[INFO] [stderr] 228 |                 TokenType::RightParen => pos = pos + 1,
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:255:33
[INFO] [stderr]     |
[INFO] [stderr] 255 | fn for_stmt_initializer(tokens: &Vec<Token>, pos: usize) -> Option<StmtResult> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:263:31
[INFO] [stderr]     |
[INFO] [stderr] 263 | fn for_stmt_condition(tokens: &Vec<Token>, pos: usize) -> Option<ExprResult> {
[INFO] [stderr]     |                               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:270:31
[INFO] [stderr]     |
[INFO] [stderr] 270 | fn for_stmt_increment(tokens: &Vec<Token>, pos: usize) -> Option<ExprResult> {
[INFO] [stderr]     |                               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:277:28
[INFO] [stderr]     |
[INFO] [stderr] 277 | fn while_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:293:28
[INFO] [stderr]     |
[INFO] [stderr] 293 | fn print_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:308:29
[INFO] [stderr]     |
[INFO] [stderr] 308 | fn return_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[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/scanner.rs:72:13
[INFO] [stderr]    |
[INFO] [stderr] 72 | /             match self.scan_token() {
[INFO] [stderr] 73 | |                 Err(e) => errors.push(e),
[INFO] [stderr] 74 | |                 _ => ()
[INFO] [stderr] 75 | |             }
[INFO] [stderr]    | |_____________^ help: try this: `if let Err(e) = self.scan_token() { errors.push(e) }`
[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: length comparison to zero
[INFO] [stderr]   --> src/scanner.rs:85:12
[INFO] [stderr]    |
[INFO] [stderr] 85 |         if errors.len() > 0 {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `!errors.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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:328:28
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn block_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:350:33
[INFO] [stderr]     |
[INFO] [stderr] 350 | fn expression_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:365:23
[INFO] [stderr]     |
[INFO] [stderr] 365 | fn expression(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:369:23
[INFO] [stderr]     |
[INFO] [stderr] 369 | fn assignment(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:393:15
[INFO] [stderr]     |
[INFO] [stderr] 393 | fn or(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:414:16
[INFO] [stderr]     |
[INFO] [stderr] 414 | fn and(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:435:21
[INFO] [stderr]     |
[INFO] [stderr] 435 | fn equality(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                     ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:456:23
[INFO] [stderr]     |
[INFO] [stderr] 456 | fn comparison(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:478:21
[INFO] [stderr]     |
[INFO] [stderr] 478 | fn addition(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                     ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:499:27
[INFO] [stderr]     |
[INFO] [stderr] 499 | fn multiplication(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                           ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/scanner.rs:276:9
[INFO] [stderr]     |
[INFO] [stderr] 276 |         self.current = self.current + 1
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.current += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/scanner.rs:280:9
[INFO] [stderr]     |
[INFO] [stderr] 280 |         self.line = self.line + 1
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.line += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]    --> src/scanner.rs:284:14
[INFO] [stderr]     |
[INFO] [stderr] 284 | fn substr(s: &String, start: usize, end: usize) -> String {
[INFO] [stderr]     |              ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:520:18
[INFO] [stderr]     |
[INFO] [stderr] 520 | fn unary(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:535:17
[INFO] [stderr]     |
[INFO] [stderr] 535 | fn call(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/parser.rs:538:13
[INFO] [stderr]     |
[INFO] [stderr] 538 | /             loop {
[INFO] [stderr] 539 | |                 match tokens[pos].token_type {
[INFO] [stderr] 540 | |                     TokenType::LeftParen => {
[INFO] [stderr] 541 | |                         let mut args: Vec<ast::Expr> = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 576 | |                 }
[INFO] [stderr] 577 | |             }
[INFO] [stderr]     | |_____________^ help: try: `while let TokenType::LeftParen = tokens[pos].token_type { .. }`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:584:20
[INFO] [stderr]     |
[INFO] [stderr] 584 | fn primary(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                    ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:17:22
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub fn parse(tokens: &Vec<Token>) -> Result<Vec<ast::Stmt>, Vec<Box<Error>>> {
[INFO] [stderr]    |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/parser.rs:59:8
[INFO] [stderr]    |
[INFO] [stderr] 59 |     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] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:66:24
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn declaration(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]    |                        ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/parser.rs:74:32
[INFO] [stderr]    |
[INFO] [stderr] 74 | fn fun_declaration<'a>(tokens: &'a Vec<Token>, mut pos: usize) -> StmtResult<'a> {
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/parser.rs:96:53
[INFO] [stderr]    |
[INFO] [stderr] 96 |                                 TokenType::Comma => pos = pos + 1,
[INFO] [stderr]    |                                                     ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/token.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 | /         match self {
[INFO] [stderr] 43 | |             &Literal::String(ref val) => write!(f, "{}", val),
[INFO] [stderr] 44 | |             &Literal::Number(ref val) => write!(f, "{}", val),
[INFO] [stderr] 45 | |             &Literal::True => write!(f, "true"),
[INFO] [stderr] 46 | |             &Literal::False => write!(f, "false"),
[INFO] [stderr] 47 | |             &Literal::Nil => write!(f, "nil")
[INFO] [stderr] 48 | |         }
[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] 42 |         match *self {
[INFO] [stderr] 43 |             Literal::String(ref val) => write!(f, "{}", val),
[INFO] [stderr] 44 |             Literal::Number(ref val) => write!(f, "{}", val),
[INFO] [stderr] 45 |             Literal::True => write!(f, "true"),
[INFO] [stderr] 46 |             Literal::False => write!(f, "false"),
[INFO] [stderr] 47 |             Literal::Nil => write!(f, "nil")
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:120:28
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn var_declaration(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:149:22
[INFO] [stderr]     |
[INFO] [stderr] 149 | fn statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                      ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:161:25
[INFO] [stderr]     |
[INFO] [stderr] 161 | fn if_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                         ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:184:26
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn for_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                          ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:199:17
[INFO] [stderr]     |
[INFO] [stderr] 199 |                 pos = pos + 2;
[INFO] [stderr]     |                 ^^^^^^^^^^^^^ help: replace it with: `pos += 2`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:213:41
[INFO] [stderr]     |
[INFO] [stderr] 213 |                 TokenType::Semicolon => pos = pos + 1,
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/parser.rs:228:42
[INFO] [stderr]     |
[INFO] [stderr] 228 |                 TokenType::RightParen => pos = pos + 1,
[INFO] [stderr]     |                                          ^^^^^^^^^^^^^ help: replace it with: `pos += 1`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:255:33
[INFO] [stderr]     |
[INFO] [stderr] 255 | fn for_stmt_initializer(tokens: &Vec<Token>, pos: usize) -> Option<StmtResult> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:263:31
[INFO] [stderr]     |
[INFO] [stderr] 263 | fn for_stmt_condition(tokens: &Vec<Token>, pos: usize) -> Option<ExprResult> {
[INFO] [stderr]     |                               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:270:31
[INFO] [stderr]     |
[INFO] [stderr] 270 | fn for_stmt_increment(tokens: &Vec<Token>, pos: usize) -> Option<ExprResult> {
[INFO] [stderr]     |                               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:277:28
[INFO] [stderr]     |
[INFO] [stderr] 277 | fn while_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:293:28
[INFO] [stderr]     |
[INFO] [stderr] 293 | fn print_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:308:29
[INFO] [stderr]     |
[INFO] [stderr] 308 | fn return_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                             ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:328:28
[INFO] [stderr]     |
[INFO] [stderr] 328 | fn block_statement(tokens: &Vec<Token>, mut pos: usize) -> StmtResult {
[INFO] [stderr]     |                            ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:350:33
[INFO] [stderr]     |
[INFO] [stderr] 350 | fn expression_statement(tokens: &Vec<Token>, pos: usize) -> StmtResult {
[INFO] [stderr]     |                                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:365:23
[INFO] [stderr]     |
[INFO] [stderr] 365 | fn expression(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:369:23
[INFO] [stderr]     |
[INFO] [stderr] 369 | fn assignment(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:393:15
[INFO] [stderr]     |
[INFO] [stderr] 393 | fn or(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |               ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/ast.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 | /         match self {
[INFO] [stderr] 168 | |             &Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 169 | |                 write!(f, "(= {} {})", assign_expr.name.lexeme, assign_expr.value)
[INFO] [stderr] 170 | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 191 | |             }
[INFO] [stderr] 192 | |         }
[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] 167 |         match *self {
[INFO] [stderr] 168 |             Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 169 |                 write!(f, "(= {} {})", assign_expr.name.lexeme, assign_expr.value)
[INFO] [stderr] 170 |             },
[INFO] [stderr] 171 |             Expr::Binary(ref bin_expr) => {
[INFO] [stderr] 172 |                 write!(f, "{}", parenthesize(&bin_expr.operator.lexeme, vec![&bin_expr.left, &bin_expr.right]))
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:414:16
[INFO] [stderr]     |
[INFO] [stderr] 414 | fn and(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/ast.rs:207:42
[INFO] [stderr]     |
[INFO] [stderr] 207 | fn parenthesize_call(callee: &str, args: &Vec<Expr>) -> String {
[INFO] [stderr]     |                                          ^^^^^^^^^^ help: change this to: `&[Expr]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:435:21
[INFO] [stderr]     |
[INFO] [stderr] 435 | fn equality(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                     ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:456:23
[INFO] [stderr]     |
[INFO] [stderr] 456 | fn comparison(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                       ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:478:21
[INFO] [stderr]     |
[INFO] [stderr] 478 | fn addition(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                     ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:499:27
[INFO] [stderr]     |
[INFO] [stderr] 499 | fn multiplication(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                           ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:520:18
[INFO] [stderr]     |
[INFO] [stderr] 520 | fn unary(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                  ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:535:17
[INFO] [stderr]     |
[INFO] [stderr] 535 | fn call(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                 ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this loop could be written as a `while let` loop
[INFO] [stderr]    --> src/parser.rs:538:13
[INFO] [stderr]     |
[INFO] [stderr] 538 | /             loop {
[INFO] [stderr] 539 | |                 match tokens[pos].token_type {
[INFO] [stderr] 540 | |                     TokenType::LeftParen => {
[INFO] [stderr] 541 | |                         let mut args: Vec<ast::Expr> = vec![];
[INFO] [stderr] ...   |
[INFO] [stderr] 576 | |                 }
[INFO] [stderr] 577 | |             }
[INFO] [stderr]     | |_____________^ help: try: `while let TokenType::LeftParen = tokens[pos].token_type { .. }`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/parser.rs:584:20
[INFO] [stderr]     |
[INFO] [stderr] 584 | fn primary(tokens: &Vec<Token>, pos: usize) -> ExprResult {
[INFO] [stderr]     |                    ^^^^^^^^^^^ help: change this to: `&[Token]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/eval.rs:9:9
[INFO] [stderr]    |
[INFO] [stderr] 9  | /         match self {
[INFO] [stderr] 10 | |             &ast::Stmt::Block(ref block_stmt) => {
[INFO] [stderr] 11 | |                 env.push_scope();
[INFO] [stderr] 12 | |                 for statement in &block_stmt.statements {
[INFO] [stderr] ...  |
[INFO] [stderr] 82 | |             }
[INFO] [stderr] 83 | |         }
[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] 9  |         match *self {
[INFO] [stderr] 10 |             ast::Stmt::Block(ref block_stmt) => {
[INFO] [stderr] 11 |                 env.push_scope();
[INFO] [stderr] 12 |                 for statement in &block_stmt.statements {
[INFO] [stderr] 13 |                     match statement.execute(env) {
[INFO] [stderr] 14 |                         Ok(None) => (),
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/eval.rs:56:29
[INFO] [stderr]    |
[INFO] [stderr] 56 |                   let value = match &ret_stmt.value {
[INFO] [stderr]    |  _____________________________^
[INFO] [stderr] 57 | |                     &Some(ref expr) => expr.evaluate(env)?,
[INFO] [stderr] 58 | |                     &None => Value::Nil
[INFO] [stderr] 59 | |                 };
[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: try
[INFO] [stderr]    |
[INFO] [stderr] 56 |                 let value = match ret_stmt.value {
[INFO] [stderr] 57 |                     Some(ref expr) => expr.evaluate(env)?,
[INFO] [stderr] 58 |                     None => Value::Nil
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 | /         match self {
[INFO] [stderr] 101 | |             &Value::Nil => write!(f, "nil"),
[INFO] [stderr] 102 | |             &Value::Boolean(b) => write!(f, "{}", b),
[INFO] [stderr] 103 | |             &Value::Function(ref fun) => write!(f, "<fun {}>", fun),
[INFO] [stderr] 104 | |             &Value::Number(n) => write!(f, "{}", n),
[INFO] [stderr] 105 | |             &Value::String(ref s) => write!(f, "\"{}\"", s)
[INFO] [stderr] 106 | |         }
[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] 100 |         match *self {
[INFO] [stderr] 101 |             Value::Nil => write!(f, "nil"),
[INFO] [stderr] 102 |             Value::Boolean(b) => write!(f, "{}", b),
[INFO] [stderr] 103 |             Value::Function(ref fun) => write!(f, "<fun {}>", fun),
[INFO] [stderr] 104 |             Value::Number(n) => write!(f, "{}", n),
[INFO] [stderr] 105 |             Value::String(ref s) => write!(f, "\"{}\"", s)
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 | /         match self {
[INFO] [stderr] 113 | |             &Value::Nil => format!("nil"),
[INFO] [stderr] 114 | |             &Value::Boolean(b) => format!("{}", b),
[INFO] [stderr] 115 | |             &Value::Function(ref fun) => format!("{}", fun),
[INFO] [stderr] 116 | |             &Value::Number(n) => format!("{}", n),
[INFO] [stderr] 117 | |             &Value::String(ref s) => format!("{}", s)
[INFO] [stderr] 118 | |         }
[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] 112 |         match *self {
[INFO] [stderr] 113 |             Value::Nil => format!("nil"),
[INFO] [stderr] 114 |             Value::Boolean(b) => format!("{}", b),
[INFO] [stderr] 115 |             Value::Function(ref fun) => format!("{}", fun),
[INFO] [stderr] 116 |             Value::Number(n) => format!("{}", n),
[INFO] [stderr] 117 |             Value::String(ref s) => format!("{}", s)
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/eval.rs:113:28
[INFO] [stderr]     |
[INFO] [stderr] 113 |             &Value::Nil => format!("nil"),
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^ help: consider using .to_string(): `"nil".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/token.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 | /         match self {
[INFO] [stderr] 43 | |             &Literal::String(ref val) => write!(f, "{}", val),
[INFO] [stderr] 44 | |             &Literal::Number(ref val) => write!(f, "{}", val),
[INFO] [stderr] 45 | |             &Literal::True => write!(f, "true"),
[INFO] [stderr] 46 | |             &Literal::False => write!(f, "false"),
[INFO] [stderr] 47 | |             &Literal::Nil => write!(f, "nil")
[INFO] [stderr] 48 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/eval.rs:117:38
[INFO] [stderr]     |
[INFO] [stderr] 117 |             &Value::String(ref s) => format!("{}", s)
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `s.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr]    = 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] 42 |         match *self {
[INFO] [stderr] 43 |             Literal::String(ref val) => write!(f, "{}", val),
[INFO] [stderr] 44 |             Literal::Number(ref val) => write!(f, "{}", val),
[INFO] [stderr] 45 |             Literal::True => write!(f, "true"),
[INFO] [stderr] 46 |             Literal::False => write!(f, "false"),
[INFO] [stderr] 47 |             Literal::Nil => write!(f, "nil")
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:194:9
[INFO] [stderr]     |
[INFO] [stderr] 194 | /         match self {
[INFO] [stderr] 195 | |             &ast::Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 196 | |                 let name = &assign_expr.name;
[INFO] [stderr] 197 | |                 let value = assign_expr.value.evaluate(env)?;
[INFO] [stderr] ...   |
[INFO] [stderr] 269 | |             // _ => panic!("I don't know how to evaluate this yet.")
[INFO] [stderr] 270 | |         }
[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] 194 |         match *self {
[INFO] [stderr] 195 |             ast::Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 196 |                 let name = &assign_expr.name;
[INFO] [stderr] 197 |                 let value = assign_expr.value.evaluate(env)?;
[INFO] [stderr] 198 |                 match env.assign(name.lexeme.clone(), value.clone()) {
[INFO] [stderr] 199 |                     Ok(_) => Ok(value),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/eval.rs:223:50
[INFO] [stderr]     |
[INFO] [stderr] 223 |               &ast::Expr::Literal(ref lit_expr) => match &lit_expr.value {
[INFO] [stderr]     |  __________________________________________________^
[INFO] [stderr] 224 | |                 &token::Literal::Nil => Ok(Value::Nil),
[INFO] [stderr] 225 | |                 &token::Literal::True => Ok(Value::Boolean(true)),
[INFO] [stderr] 226 | |                 &token::Literal::False => Ok(Value::Boolean(false)),
[INFO] [stderr] 227 | |                 &token::Literal::Number(n) => Ok(Value::Number(n)),
[INFO] [stderr] 228 | |                 &token::Literal::String(ref s) => Ok(Value::String(s.clone()))
[INFO] [stderr] 229 | |             },
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 223 |             &ast::Expr::Literal(ref lit_expr) => match lit_expr.value {
[INFO] [stderr] 224 |                 token::Literal::Nil => Ok(Value::Nil),
[INFO] [stderr] 225 |                 token::Literal::True => Ok(Value::Boolean(true)),
[INFO] [stderr] 226 |                 token::Literal::False => Ok(Value::Boolean(false)),
[INFO] [stderr] 227 |                 token::Literal::Number(n) => Ok(Value::Number(n)),
[INFO] [stderr] 228 |                 token::Literal::String(ref s) => Ok(Value::String(s.clone()))
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:275:5
[INFO] [stderr]     |
[INFO] [stderr] 275 | /     match val {
[INFO] [stderr] 276 | |         &Value::Nil => false,
[INFO] [stderr] 277 | |         &Value::Boolean(b) => b,
[INFO] [stderr] 278 | |         _ => true
[INFO] [stderr] 279 | |     }
[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] 275 |     match *val {
[INFO] [stderr] 276 |         Value::Nil => false,
[INFO] [stderr] 277 |         Value::Boolean(b) => b,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: needlessly taken reference of both operands
[INFO] [stderr]    --> src/eval.rs:289:39
[INFO] [stderr]     |
[INFO] [stderr] 289 |             Value::Function(b_fun) => &a_fun == &b_fun,
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::op_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#op_ref
[INFO] [stderr] help: use the values directly
[INFO] [stderr]     |
[INFO] [stderr] 289 |             Value::Function(b_fun) => a_fun == b_fun,
[INFO] [stderr]     |                                       ^^^^^    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/eval.rs:297:37
[INFO] [stderr]     |
[INFO] [stderr] 297 |             Value::Number(b_num) => a_num == b_num,
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^ help: consider comparing them within some error: `(a_num - b_num).abs() < error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::float_cmp)] on by default
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/eval.rs:297:37
[INFO] [stderr]     |
[INFO] [stderr] 297 |             Value::Number(b_num) => a_num == b_num,
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]    --> src/eval.rs:307:21
[INFO] [stderr]     |
[INFO] [stderr] 307 | fn eval_binary_expr<'a>(operator: &token::Token,
[INFO] [stderr]     |                     ^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[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/env.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 | /         match self.scopes.pop() {
[INFO] [stderr] 22 | |             Some(_) => self.current_scope -= 1,
[INFO] [stderr] 23 | |             None => ()
[INFO] [stderr] 24 | |         }
[INFO] [stderr]    | |_________^ help: try this: `if let Some(_) = self.scopes.pop() { self.current_scope -= 1 }`
[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: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/env.rs:52:29
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn get(&self, name: &String) -> Option<&Value> {
[INFO] [stderr]    |                             ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/env.rs:63:34
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn get_in_scope(&self, name: &String, scope: usize) -> Option<&Value> {
[INFO] [stderr]    |                                  ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/ast.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 | /         match self {
[INFO] [stderr] 168 | |             &Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 169 | |                 write!(f, "(= {} {})", assign_expr.name.lexeme, assign_expr.value)
[INFO] [stderr] 170 | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 191 | |             }
[INFO] [stderr] 192 | |         }
[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] 167 |         match *self {
[INFO] [stderr] 168 |             Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 169 |                 write!(f, "(= {} {})", assign_expr.name.lexeme, assign_expr.value)
[INFO] [stderr] 170 |             },
[INFO] [stderr] 171 |             Expr::Binary(ref bin_expr) => {
[INFO] [stderr] 172 |                 write!(f, "{}", parenthesize(&bin_expr.operator.lexeme, vec![&bin_expr.left, &bin_expr.right]))
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/ast.rs:207:42
[INFO] [stderr]     |
[INFO] [stderr] 207 | fn parenthesize_call(callee: &str, args: &Vec<Expr>) -> String {
[INFO] [stderr]     |                                          ^^^^^^^^^^ help: change this to: `&[Expr]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `Interpreter`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | /     pub fn new() -> Interpreter {
[INFO] [stderr] 20 | |         Interpreter { env: Environment::new() }
[INFO] [stderr] 21 | |     }
[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] 18 | impl Default for Interpreter {
[INFO] [stderr] 19 |     fn default() -> Self {
[INFO] [stderr] 20 |         Self::new()
[INFO] [stderr] 21 |     }
[INFO] [stderr] 22 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/lib.rs:41:28
[INFO] [stderr]    |
[INFO] [stderr] 41 |                         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] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/eval.rs:9:9
[INFO] [stderr]    |
[INFO] [stderr] 9  | /         match self {
[INFO] [stderr] 10 | |             &ast::Stmt::Block(ref block_stmt) => {
[INFO] [stderr] 11 | |                 env.push_scope();
[INFO] [stderr] 12 | |                 for statement in &block_stmt.statements {
[INFO] [stderr] ...  |
[INFO] [stderr] 82 | |             }
[INFO] [stderr] 83 | |         }
[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] 9  |         match *self {
[INFO] [stderr] 10 |             ast::Stmt::Block(ref block_stmt) => {
[INFO] [stderr] 11 |                 env.push_scope();
[INFO] [stderr] 12 |                 for statement in &block_stmt.statements {
[INFO] [stderr] 13 |                     match statement.execute(env) {
[INFO] [stderr] 14 |                         Ok(None) => (),
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]   --> src/eval.rs:56:29
[INFO] [stderr]    |
[INFO] [stderr] 56 |                   let value = match &ret_stmt.value {
[INFO] [stderr]    |  _____________________________^
[INFO] [stderr] 57 | |                     &Some(ref expr) => expr.evaluate(env)?,
[INFO] [stderr] 58 | |                     &None => Value::Nil
[INFO] [stderr] 59 | |                 };
[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: try
[INFO] [stderr]    |
[INFO] [stderr] 56 |                 let value = match ret_stmt.value {
[INFO] [stderr] 57 |                     Some(ref expr) => expr.evaluate(env)?,
[INFO] [stderr] 58 |                     None => Value::Nil
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rlox`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:100:9
[INFO] [stderr]     |
[INFO] [stderr] 100 | /         match self {
[INFO] [stderr] 101 | |             &Value::Nil => write!(f, "nil"),
[INFO] [stderr] 102 | |             &Value::Boolean(b) => write!(f, "{}", b),
[INFO] [stderr] 103 | |             &Value::Function(ref fun) => write!(f, "<fun {}>", fun),
[INFO] [stderr] 104 | |             &Value::Number(n) => write!(f, "{}", n),
[INFO] [stderr] 105 | |             &Value::String(ref s) => write!(f, "\"{}\"", s)
[INFO] [stderr] 106 | |         }
[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] 100 |         match *self {
[INFO] [stderr] 101 |             Value::Nil => write!(f, "nil"),
[INFO] [stderr] 102 |             Value::Boolean(b) => write!(f, "{}", b),
[INFO] [stderr] 103 |             Value::Function(ref fun) => write!(f, "<fun {}>", fun),
[INFO] [stderr] 104 |             Value::Number(n) => write!(f, "{}", n),
[INFO] [stderr] 105 |             Value::String(ref s) => write!(f, "\"{}\"", s)
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:112:9
[INFO] [stderr]     |
[INFO] [stderr] 112 | /         match self {
[INFO] [stderr] 113 | |             &Value::Nil => format!("nil"),
[INFO] [stderr] 114 | |             &Value::Boolean(b) => format!("{}", b),
[INFO] [stderr] 115 | |             &Value::Function(ref fun) => format!("{}", fun),
[INFO] [stderr] 116 | |             &Value::Number(n) => format!("{}", n),
[INFO] [stderr] 117 | |             &Value::String(ref s) => format!("{}", s)
[INFO] [stderr] 118 | |         }
[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] 112 |         match *self {
[INFO] [stderr] 113 |             Value::Nil => format!("nil"),
[INFO] [stderr] 114 |             Value::Boolean(b) => format!("{}", b),
[INFO] [stderr] 115 |             Value::Function(ref fun) => format!("{}", fun),
[INFO] [stderr] 116 |             Value::Number(n) => format!("{}", n),
[INFO] [stderr] 117 |             Value::String(ref s) => format!("{}", s)
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/eval.rs:113:28
[INFO] [stderr]     |
[INFO] [stderr] 113 |             &Value::Nil => format!("nil"),
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^ help: consider using .to_string(): `"nil".to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::useless_format)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr] 
[INFO] [stderr] warning: useless use of `format!`
[INFO] [stderr]    --> src/eval.rs:117:38
[INFO] [stderr]     |
[INFO] [stderr] 117 |             &Value::String(ref s) => format!("{}", s)
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^^^^ help: consider using .to_string(): `s.to_string()`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:194:9
[INFO] [stderr]     |
[INFO] [stderr] 194 | /         match self {
[INFO] [stderr] 195 | |             &ast::Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 196 | |                 let name = &assign_expr.name;
[INFO] [stderr] 197 | |                 let value = assign_expr.value.evaluate(env)?;
[INFO] [stderr] ...   |
[INFO] [stderr] 269 | |             // _ => panic!("I don't know how to evaluate this yet.")
[INFO] [stderr] 270 | |         }
[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] 194 |         match *self {
[INFO] [stderr] 195 |             ast::Expr::Assign(ref assign_expr) => {
[INFO] [stderr] 196 |                 let name = &assign_expr.name;
[INFO] [stderr] 197 |                 let value = assign_expr.value.evaluate(env)?;
[INFO] [stderr] 198 |                 match env.assign(name.lexeme.clone(), value.clone()) {
[INFO] [stderr] 199 |                     Ok(_) => Ok(value),
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to both the expression and the patterns
[INFO] [stderr]    --> src/eval.rs:223:50
[INFO] [stderr]     |
[INFO] [stderr] 223 |               &ast::Expr::Literal(ref lit_expr) => match &lit_expr.value {
[INFO] [stderr]     |  __________________________________________________^
[INFO] [stderr] 224 | |                 &token::Literal::Nil => Ok(Value::Nil),
[INFO] [stderr] 225 | |                 &token::Literal::True => Ok(Value::Boolean(true)),
[INFO] [stderr] 226 | |                 &token::Literal::False => Ok(Value::Boolean(false)),
[INFO] [stderr] 227 | |                 &token::Literal::Number(n) => Ok(Value::Number(n)),
[INFO] [stderr] 228 | |                 &token::Literal::String(ref s) => Ok(Value::String(s.clone()))
[INFO] [stderr] 229 | |             },
[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: try
[INFO] [stderr]     |
[INFO] [stderr] 223 |             &ast::Expr::Literal(ref lit_expr) => match lit_expr.value {
[INFO] [stderr] 224 |                 token::Literal::Nil => Ok(Value::Nil),
[INFO] [stderr] 225 |                 token::Literal::True => Ok(Value::Boolean(true)),
[INFO] [stderr] 226 |                 token::Literal::False => Ok(Value::Boolean(false)),
[INFO] [stderr] 227 |                 token::Literal::Number(n) => Ok(Value::Number(n)),
[INFO] [stderr] 228 |                 token::Literal::String(ref s) => Ok(Value::String(s.clone()))
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/eval.rs:275:5
[INFO] [stderr]     |
[INFO] [stderr] 275 | /     match val {
[INFO] [stderr] 276 | |         &Value::Nil => false,
[INFO] [stderr] 277 | |         &Value::Boolean(b) => b,
[INFO] [stderr] 278 | |         _ => true
[INFO] [stderr] 279 | |     }
[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] 275 |     match *val {
[INFO] [stderr] 276 |         Value::Nil => false,
[INFO] [stderr] 277 |         Value::Boolean(b) => b,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: needlessly taken reference of both operands
[INFO] [stderr]    --> src/eval.rs:289:39
[INFO] [stderr]     |
[INFO] [stderr] 289 |             Value::Function(b_fun) => &a_fun == &b_fun,
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::op_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#op_ref
[INFO] [stderr] help: use the values directly
[INFO] [stderr]     |
[INFO] [stderr] 289 |             Value::Function(b_fun) => a_fun == b_fun,
[INFO] [stderr]     |                                       ^^^^^    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: strict comparison of f32 or f64
[INFO] [stderr]    --> src/eval.rs:297:37
[INFO] [stderr]     |
[INFO] [stderr] 297 |             Value::Number(b_num) => a_num == b_num,
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^ help: consider comparing them within some error: `(a_num - b_num).abs() < error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::float_cmp)] on by default
[INFO] [stderr] note: std::f32::EPSILON and std::f64::EPSILON are available.
[INFO] [stderr]    --> src/eval.rs:297:37
[INFO] [stderr]     |
[INFO] [stderr] 297 |             Value::Number(b_num) => a_num == b_num,
[INFO] [stderr]     |                                     ^^^^^^^^^^^^^^
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
[INFO] [stderr] 
[INFO] [stderr] warning: this lifetime isn't used in the function definition
[INFO] [stderr]    --> src/eval.rs:307:21
[INFO] [stderr]     |
[INFO] [stderr] 307 | fn eval_binary_expr<'a>(operator: &token::Token,
[INFO] [stderr]     |                     ^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::extra_unused_lifetimes)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_lifetimes
[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/env.rs:21:9
[INFO] [stderr]    |
[INFO] [stderr] 21 | /         match self.scopes.pop() {
[INFO] [stderr] 22 | |             Some(_) => self.current_scope -= 1,
[INFO] [stderr] 23 | |             None => ()
[INFO] [stderr] 24 | |         }
[INFO] [stderr]    | |_________^ help: try this: `if let Some(_) = self.scopes.pop() { self.current_scope -= 1 }`
[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: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/env.rs:52:29
[INFO] [stderr]    |
[INFO] [stderr] 52 |     pub fn get(&self, name: &String) -> Option<&Value> {
[INFO] [stderr]    |                             ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: writing `&String` instead of `&str` involves a new object where a slice will do.
[INFO] [stderr]   --> src/env.rs:63:34
[INFO] [stderr]    |
[INFO] [stderr] 63 |     fn get_in_scope(&self, name: &String, scope: usize) -> Option<&Value> {
[INFO] [stderr]    |                                  ^^^^^^^ help: change this to: `&str`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: you should consider adding a `Default` implementation for `Interpreter`
[INFO] [stderr]   --> src/lib.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 | /     pub fn new() -> Interpreter {
[INFO] [stderr] 20 | |         Interpreter { env: Environment::new() }
[INFO] [stderr] 21 | |     }
[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] 18 | impl Default for Interpreter {
[INFO] [stderr] 19 |     fn default() -> Self {
[INFO] [stderr] 20 |         Self::new()
[INFO] [stderr] 21 |     }
[INFO] [stderr] 22 | }
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: length comparison to zero
[INFO] [stderr]   --> src/lib.rs:41:28
[INFO] [stderr]    |
[INFO] [stderr] 41 |                         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 previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rlox`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2498ce2501da4f14d650112393d7a7cad4bc3f9d02b5a45b71868b811d948fac"`
[INFO] running `"docker" "rm" "-f" "2498ce2501da4f14d650112393d7a7cad4bc3f9d02b5a45b71868b811d948fac"`
[INFO] [stdout] 2498ce2501da4f14d650112393d7a7cad4bc3f9d02b5a45b71868b811d948fac