[INFO] updating cached repository EmmaLa/MonkeyInterpreter
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/EmmaLa/MonkeyInterpreter
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/EmmaLa/MonkeyInterpreter" "work/ex/clippy-test-run/sources/stable/gh/EmmaLa/MonkeyInterpreter"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/EmmaLa/MonkeyInterpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/EmmaLa/MonkeyInterpreter" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/EmmaLa/MonkeyInterpreter"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/EmmaLa/MonkeyInterpreter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 538fab97895b45c362be501f897eecf95811dcf0
[INFO] sha for GitHub repo EmmaLa/MonkeyInterpreter: 538fab97895b45c362be501f897eecf95811dcf0
[INFO] validating manifest of EmmaLa/MonkeyInterpreter 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 EmmaLa/MonkeyInterpreter 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 EmmaLa/MonkeyInterpreter
[INFO] finished frobbing EmmaLa/MonkeyInterpreter
[INFO] frobbed toml for EmmaLa/MonkeyInterpreter written to work/ex/clippy-test-run/sources/stable/gh/EmmaLa/MonkeyInterpreter/Cargo.toml
[INFO] started frobbing EmmaLa/MonkeyInterpreter
[INFO] finished frobbing EmmaLa/MonkeyInterpreter
[INFO] frobbed toml for EmmaLa/MonkeyInterpreter written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/EmmaLa/MonkeyInterpreter/Cargo.toml
[INFO] crate EmmaLa/MonkeyInterpreter 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 EmmaLa/MonkeyInterpreter against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/EmmaLa/MonkeyInterpreter:/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] 8c9e45dfa504e45839e4a4fb26e91d56ef3d7c16b1f5b27e652b48df80c95a88
[INFO] running `"docker" "start" "-a" "8c9e45dfa504e45839e4a4fb26e91d56ef3d7c16b1f5b27e652b48df80c95a88"`
[INFO] [stderr]     Checking monkey_int v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/lexer/reader.rs:19:11
[INFO] [stderr]    |
[INFO] [stderr] 19 |         Reader{ code: code }
[INFO] [stderr]    |                 ^^^^^^^^^^ help: replace it with: `code`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:51:7
[INFO] [stderr]    |
[INFO] [stderr] 51 |             lexer: lexer, 
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `lexer`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:52:4
[INFO] [stderr]    |
[INFO] [stderr] 52 |             prefix_parse_funcs: prefix_parse_funcs,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `prefix_parse_funcs`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:53:4
[INFO] [stderr]    |
[INFO] [stderr] 53 |             infix_parse_funcs: infix_parse_funcs,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `infix_parse_funcs`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 |             precedences: precedences
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `precedences`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 |             token: token,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:85:5
[INFO] [stderr]    |
[INFO] [stderr] 85 |                 token: token,
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |                 token: token,
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/lexer/reader.rs:19:11
[INFO] [stderr]    |
[INFO] [stderr] 19 |         Reader{ code: code }
[INFO] [stderr]    |                 ^^^^^^^^^^ help: replace it with: `code`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:51:7
[INFO] [stderr]    |
[INFO] [stderr] 51 |             lexer: lexer, 
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `lexer`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:52:4
[INFO] [stderr]    |
[INFO] [stderr] 52 |             prefix_parse_funcs: prefix_parse_funcs,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `prefix_parse_funcs`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:53:4
[INFO] [stderr]    |
[INFO] [stderr] 53 |             infix_parse_funcs: infix_parse_funcs,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `infix_parse_funcs`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 |             precedences: precedences
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `precedences`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 |             token: token,
[INFO] [stderr]    |             ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:85:5
[INFO] [stderr]    |
[INFO] [stderr] 85 |                 token: token,
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/parser/mod.rs:97:5
[INFO] [stderr]    |
[INFO] [stderr] 97 |                 token: token,
[INFO] [stderr]    |                 ^^^^^^^^^^^^ help: replace it with: `token`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]   --> src/parser/mod.rs:78:3
[INFO] [stderr]    |
[INFO] [stderr] 78 |         prefix_expression
[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/parser/mod.rs:74:27
[INFO] [stderr]    |
[INFO] [stderr] 74 |           let prefix_expression = PrefixExpression{
[INFO] [stderr]    |  _________________________________^
[INFO] [stderr] 75 | |             token: saved_current_token,
[INFO] [stderr] 76 | |             right: Box::new(self.parse_expression(TokenPriority::Prefix).unwrap())    
[INFO] [stderr] 77 | |         };
[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: unused import: `ast::Statement::*`
[INFO] [stderr]    --> src/parser/mod.rs:155:7
[INFO] [stderr]     |
[INFO] [stderr] 155 |         use ast::Statement::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `repl::Repl`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use repl::Repl;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::Peekable`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::iter::Peekable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `lexer::token::Token::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use lexer::token::Token::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/repl/mod.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 |             Ok(n) => buffer,
[INFO] [stderr]    |                ^ help: consider using `_n` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/repl/mod.rs:27:11
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(error) => {
[INFO] [stderr]    |                 ^^^^^ help: consider using `_error` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut content = String::from("-4+2;");
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_equal_sign`
[INFO] [stderr]   --> src/lexer/reader.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]   --> src/lexer/reader.rs:69:2
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn read_identifier(&mut self, character: char) -> Option<Token> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_letter`
[INFO] [stderr]   --> src/lexer/mod.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Repl`
[INFO] [stderr]  --> src/repl/mod.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Repl;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]  --> src/repl/mod.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn run(){
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_user_input`
[INFO] [stderr]   --> src/repl/mod.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn read_user_input(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:51:2
[INFO] [stderr]    |
[INFO] [stderr] 51 |       Expression {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 52 | |         token: Token,
[INFO] [stderr] 53 | |         value: Box<Statement>
[INFO] [stderr] 54 | |     },
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser/mod.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Call = 7
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token_is_int`
[INFO] [stderr]    --> src/parser/mod.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn next_token_is_int(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]  --> src/lexer/reader.rs:9:25
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]   |                         ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/lexer/reader.rs:13:29
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    |                             ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: the `ch @ _` pattern can be written as just `ch`
[INFO] [stderr]   --> src/lexer/reader.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |             Some(ch @ _) => func(ch),
[INFO] [stderr]    |                  ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/lexer/mod.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    |                         ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: the `character @ _` pattern can be written as just `character`
[INFO] [stderr]   --> src/lexer/mod.rs:90:9
[INFO] [stderr]    |
[INFO] [stderr] 90 |             Some(character @ _) => self.read_identifier(character),
[INFO] [stderr]    |                  ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: variable `PROMPT` should have a snake case name such as `prompt`
[INFO] [stderr]   --> src/repl/mod.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let PROMPT = ">> ";
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl/mod.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 |             io::stdout().flush();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/parser/mod.rs:275:3
[INFO] [stderr]     |
[INFO] [stderr] 275 |           self.precedences
[INFO] [stderr]     |  _________^
[INFO] [stderr] 276 | |             .get(&self.next_token.clone().unwrap_or(Token::Illegal))
[INFO] [stderr] 277 | |             .map(|precedence| precedence.clone())
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 275 |         self.precedences
[INFO] [stderr] 276 |             .get(&self.next_token.clone().unwrap_or(Token::Illegal)).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/parser/mod.rs:282:3
[INFO] [stderr]     |
[INFO] [stderr] 282 |           self.precedences
[INFO] [stderr]     |  _________^
[INFO] [stderr] 283 | |             .get(&self.current_token.clone().unwrap_or(Token::Illegal))
[INFO] [stderr] 284 | |             .map(|precedence| precedence.clone())
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 282 |         self.precedences
[INFO] [stderr] 283 |             .get(&self.current_token.clone().unwrap_or(Token::Illegal)).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: returning the result of a let binding from a block. Consider returning the expression directly.
[INFO] [stderr]   --> src/parser/mod.rs:78:3
[INFO] [stderr]    |
[INFO] [stderr] 78 |         prefix_expression
[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/parser/mod.rs:74:27
[INFO] [stderr]    |
[INFO] [stderr] 74 |           let prefix_expression = PrefixExpression{
[INFO] [stderr]    |  _________________________________^
[INFO] [stderr] 75 | |             token: saved_current_token,
[INFO] [stderr] 76 | |             right: Box::new(self.parse_expression(TokenPriority::Prefix).unwrap())    
[INFO] [stderr] 77 | |         };
[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: unused import: `ast::Statement::*`
[INFO] [stderr]    --> src/parser/mod.rs:155:7
[INFO] [stderr]     |
[INFO] [stderr] 155 |         use ast::Statement::*;
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `repl::Repl`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use repl::Repl;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::fs::File`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use std::fs::File;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::Read`
[INFO] [stderr]  --> src/main.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::Read;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::iter::Peekable`
[INFO] [stderr]   --> src/main.rs:10:5
[INFO] [stderr]    |
[INFO] [stderr] 10 | use std::iter::Peekable;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `lexer::token::Token::*`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 | use lexer::token::Token::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `n`
[INFO] [stderr]   --> src/repl/mod.rs:26:10
[INFO] [stderr]    |
[INFO] [stderr] 26 |             Ok(n) => buffer,
[INFO] [stderr]    |                ^ help: consider using `_n` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `error`
[INFO] [stderr]   --> src/repl/mod.rs:27:11
[INFO] [stderr]    |
[INFO] [stderr] 27 |             Err(error) => {
[INFO] [stderr]    |                 ^^^^^ help: consider using `_error` instead
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |     let mut content = String::from("-4+2;");
[INFO] [stderr]    |         ----^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_equal_sign`
[INFO] [stderr]   --> src/lexer/reader.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_identifier`
[INFO] [stderr]   --> src/lexer/reader.rs:69:2
[INFO] [stderr]    |
[INFO] [stderr] 69 |     pub fn read_identifier(&mut self, character: char) -> Option<Token> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_letter`
[INFO] [stderr]   --> src/lexer/mod.rs:13:1
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Repl`
[INFO] [stderr]  --> src/repl/mod.rs:6:1
[INFO] [stderr]   |
[INFO] [stderr] 6 | pub struct Repl;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `run`
[INFO] [stderr]  --> src/repl/mod.rs:9:2
[INFO] [stderr]   |
[INFO] [stderr] 9 |     pub fn run(){
[INFO] [stderr]   |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `read_user_input`
[INFO] [stderr]   --> src/repl/mod.rs:23:2
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn read_user_input(&mut self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:51:2
[INFO] [stderr]    |
[INFO] [stderr] 51 |       Expression {
[INFO] [stderr]    |  _____^
[INFO] [stderr] 52 | |         token: Token,
[INFO] [stderr] 53 | |         value: Box<Statement>
[INFO] [stderr] 54 | |     },
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Call`
[INFO] [stderr]   --> src/parser/mod.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     Call = 7
[INFO] [stderr]    |     ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token_is_int`
[INFO] [stderr]    --> src/parser/mod.rs:236:2
[INFO] [stderr]     |
[INFO] [stderr] 236 |     fn next_token_is_int(&mut self) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]  --> src/lexer/reader.rs:9:25
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]   |                         ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/lexer/reader.rs:13:29
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_equal_sign(character: &char) -> bool {
[INFO] [stderr]    |                             ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: the `ch @ _` pattern can be written as just `ch`
[INFO] [stderr]   --> src/lexer/reader.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |             Some(ch @ _) => func(ch),
[INFO] [stderr]    |                  ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/lexer/mod.rs:13:25
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn is_letter(character: &char) -> bool {
[INFO] [stderr]    |                         ^^^^^ help: consider passing by value instead: `char`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: the `character @ _` pattern can be written as just `character`
[INFO] [stderr]   --> src/lexer/mod.rs:90:9
[INFO] [stderr]    |
[INFO] [stderr] 90 |             Some(character @ _) => self.read_identifier(character),
[INFO] [stderr]    |                  ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: variable `PROMPT` should have a snake case name such as `prompt`
[INFO] [stderr]   --> src/repl/mod.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |         let PROMPT = ">> ";
[INFO] [stderr]    |             ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/repl/mod.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 |             io::stdout().flush();
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/parser/mod.rs:275:3
[INFO] [stderr]     |
[INFO] [stderr] 275 |           self.precedences
[INFO] [stderr]     |  _________^
[INFO] [stderr] 276 | |             .get(&self.next_token.clone().unwrap_or(Token::Illegal))
[INFO] [stderr] 277 | |             .map(|precedence| precedence.clone())
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::map_clone)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 275 |         self.precedences
[INFO] [stderr] 276 |             .get(&self.next_token.clone().unwrap_or(Token::Illegal)).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: You are using an explicit closure for cloning elements
[INFO] [stderr]    --> src/parser/mod.rs:282:3
[INFO] [stderr]     |
[INFO] [stderr] 282 |           self.precedences
[INFO] [stderr]     |  _________^
[INFO] [stderr] 283 | |             .get(&self.current_token.clone().unwrap_or(Token::Illegal))
[INFO] [stderr] 284 | |             .map(|precedence| precedence.clone())
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone
[INFO] [stderr] help: Consider calling the dedicated `cloned` method
[INFO] [stderr]     |
[INFO] [stderr] 282 |         self.precedences
[INFO] [stderr] 283 |             .get(&self.current_token.clone().unwrap_or(Token::Illegal)).cloned()
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.65s
[INFO] running `"docker" "inspect" "8c9e45dfa504e45839e4a4fb26e91d56ef3d7c16b1f5b27e652b48df80c95a88"`
[INFO] running `"docker" "rm" "-f" "8c9e45dfa504e45839e4a4fb26e91d56ef3d7c16b1f5b27e652b48df80c95a88"`
[INFO] [stdout] 8c9e45dfa504e45839e4a4fb26e91d56ef3d7c16b1f5b27e652b48df80c95a88