[INFO] cloning repository https://github.com/jazzycamel/rustymonkey
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jazzycamel/rustymonkey" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjazzycamel%2Frustymonkey", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjazzycamel%2Frustymonkey'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5e3473e99a8a21554b7ae4756a37dfcdee08c773
[INFO] linting jazzycamel/rustymonkey against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjazzycamel%2Frustymonkey" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jazzycamel/rustymonkey
[INFO] finished tweaking git repo https://github.com/jazzycamel/rustymonkey
[INFO] tweaked toml for git repo https://github.com/jazzycamel/rustymonkey written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jazzycamel/rustymonkey on toolchain nightly
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jazzycamel/rustymonkey already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded as-any v0.3.1
[INFO] [stderr]   Downloaded bumpalo v3.15.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 454c3dedd20d2b7b7213acbb1717372b2d0b4ea9f8a72a4e989d4c547364fec8
[INFO] running `Command { std: "docker" "start" "-a" "454c3dedd20d2b7b7213acbb1717372b2d0b4ea9f8a72a4e989d4c547364fec8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "454c3dedd20d2b7b7213acbb1717372b2d0b4ea9f8a72a4e989d4c547364fec8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "454c3dedd20d2b7b7213acbb1717372b2d0b4ea9f8a72a4e989d4c547364fec8", kill_on_drop: false }`
[INFO] [stdout] 454c3dedd20d2b7b7213acbb1717372b2d0b4ea9f8a72a4e989d4c547364fec8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "clippy" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 01f2de0410a3fc86f43957b3b7ed3e370674335e0ab168c1edef6dfe763e2ac5
[INFO] running `Command { std: "docker" "start" "-a" "01f2de0410a3fc86f43957b3b7ed3e370674335e0ab168c1edef6dfe763e2ac5", kill_on_drop: false }`
[INFO] [stderr]     Checking as-any v0.3.1
[INFO] [stderr]     Checking whoami v1.5.1
[INFO] [stderr]     Checking dyn-clone v1.0.17
[INFO] [stderr]     Checking rustymonkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `as_str` is never used
[INFO] [stdout]   --> src/token.rs:44:12
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl TokenType {
[INFO] [stdout]    | -------------- method in this implementation
[INFO] [stdout] 44 |     pub fn as_str(&self) -> &'static str {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/token.rs:104:12
[INFO] [stdout]     |
[INFO] [stdout] 103 | impl Token {
[INFO] [stdout]     | ---------- associated function in this implementation
[INFO] [stdout] 104 |     pub fn new(token_type: TokenType, literal: String) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_concrete_statement` is never used
[INFO] [stdout]   --> src/ast.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn to_concrete_statement<T: Clone + 'static>(statement: &Box<dyn Statement>) -> Box<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `to_concrete_expression` is never used
[INFO] [stdout]   --> src/ast.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | pub fn to_concrete_expression<T: Clone + 'static>(expression: &Box<dyn Expression>) -> Box<T> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Program` is never constructed
[INFO] [stdout]   --> src/ast.rs:74:12
[INFO] [stdout]    |
[INFO] [stdout] 74 | pub struct Program {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]    --> src/ast.rs:101:12
[INFO] [stdout]     |
[INFO] [stdout] 100 | impl Program {
[INFO] [stdout]     | ------------ associated function in this implementation
[INFO] [stdout] 101 |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Identifier` is never constructed
[INFO] [stdout]    --> src/ast.rs:109:12
[INFO] [stdout]     |
[INFO] [stdout] 109 | pub struct Identifier {
[INFO] [stdout]     |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LetStatement` is never constructed
[INFO] [stdout]    --> src/ast.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout] 125 | pub struct LetStatement {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ReturnStatement` is never constructed
[INFO] [stdout]    --> src/ast.rs:142:12
[INFO] [stdout]     |
[INFO] [stdout] 142 | pub struct ReturnStatement {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `IntegerLiteral` is never constructed
[INFO] [stdout]    --> src/ast.rs:168:12
[INFO] [stdout]     |
[INFO] [stdout] 168 | pub struct IntegerLiteral {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ExpressionStatement` is never constructed
[INFO] [stdout]    --> src/ast.rs:184:12
[INFO] [stdout]     |
[INFO] [stdout] 184 | pub struct ExpressionStatement {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `PrefixExpression` is never constructed
[INFO] [stdout]    --> src/ast.rs:204:12
[INFO] [stdout]     |
[INFO] [stdout] 204 | pub struct PrefixExpression {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `InfixExpression` is never constructed
[INFO] [stdout]    --> src/ast.rs:221:12
[INFO] [stdout]     |
[INFO] [stdout] 221 | pub struct InfixExpression {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Precedence` is never used
[INFO] [stdout]  --> src/parser.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 | enum Precedence {
[INFO] [stdout]   |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `precedence_for_token_type` is never used
[INFO] [stdout]   --> src/parser.rs:17:4
[INFO] [stdout]    |
[INFO] [stdout] 17 | fn precedence_for_token_type(token_type: &TokenType) -> Precedence {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Parser` is never constructed
[INFO] [stdout]   --> src/parser.rs:32:8
[INFO] [stdout]    |
[INFO] [stdout] 32 | struct Parser {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/parser.rs:40:12
[INFO] [stdout]     |
[INFO] [stdout]  39 | impl Parser {
[INFO] [stdout]     | ----------- associated items in this implementation
[INFO] [stdout]  40 |     pub fn new(lexer: Lexer) -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout]  52 |     fn next_token(&mut self) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  57 |     fn current_token_is(&self, token_type: TokenType) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  61 |     fn peek_token_is(&self, token_type: TokenType) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  65 |     fn expect_peek(&mut self, token_type: TokenType) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  75 |     fn peek_error(&mut self, token_type: TokenType) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  82 |     fn peek_precedence(&self) -> Precedence {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  86 |     fn current_precedence(&self) -> Precedence {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  90 |     pub fn parse_program(&mut self) -> Program {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 103 |     pub fn errors(&self) -> Vec<String> {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 107 |     fn parse_statement(&mut self) -> Option<Box<dyn Statement>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 115 |     fn parse_let_statement(&mut self) -> Option<Box<dyn Statement>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 144 |     fn parse_return_statement(&mut self) -> Option<Box<dyn Statement>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 162 |     fn parse_expression_statement(&mut self) -> Option<Box<dyn Statement>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 176 |     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<dyn Expression>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 202 |     fn parse_identifier(&mut self) -> Option<Box<dyn Expression>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 209 |     fn parser_integer_literal(&mut self) -> Option<Box<dyn Expression>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 225 |     fn parse_prefix_expression(&mut self) -> Option<Box<dyn Expression>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 237 |     fn parse_infix_expression(&mut self, left: Box<dyn Expression>) -> Option<Box<dyn Expression>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EOF` contains a capitalized acronym
[INFO] [stdout]  --> src/token.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     EOF,
[INFO] [stdout]   |     ^^^ help: consider making the acronym lowercase, except the initial letter (notice the capitalization): `Eof`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout]   = note: `#[warn(clippy::upper_case_acronyms)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&String` instead of `&str` involves a new object where a slice will do
[INFO] [stdout]   --> src/token.rs:83:42
[INFO] [stdout]    |
[INFO] [stdout] 83 |     pub fn lookup_identifier(identifier: &String) -> TokenType {
[INFO] [stdout]    |                                          ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]    = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]    |
[INFO] [stdout] 83 ~     pub fn lookup_identifier(identifier: &str) -> TokenType {
[INFO] [stdout] 84 ~         match identifier {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |         'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_'
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('a'..='z').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout]    = note: `#[warn(clippy::manual_range_contains)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:23:35
[INFO] [stdout]    |
[INFO] [stdout] 23 |         'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_'
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('A'..='Z').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         '0' <= ch && ch <= '9'
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('0'..='9').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/lexer.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |         return token;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]     = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 121 -         return token;
[INFO] [stdout] 121 +         token
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]   --> src/ast.rs:59:61
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn to_concrete_statement<T: Clone + 'static>(statement: &Box<dyn Statement>) -> Box<T> {
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout]    = note: `#[warn(clippy::borrowed_box)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]   --> src/ast.rs:69:63
[INFO] [stdout]    |
[INFO] [stdout] 69 | pub fn to_concrete_expression<T: Clone + 'static>(expression: &Box<dyn Expression>) -> Box<T> {
[INFO] [stdout]    |                                                               ^^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Expression`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/ast.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |         if self.statements.len() > 0 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!self.statements.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `push_str()` using a single-character string literal
[INFO] [stdout]    --> src/ast.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |         out.push_str(";");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `out.push(';')`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_add_str
[INFO] [stdout]     = note: `#[warn(clippy::single_char_add_str)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: called `unwrap` on `self.expression` after checking its variant with `is_none`
[INFO] [stdout]    --> src/ast.rs:198:29
[INFO] [stdout]     |
[INFO] [stdout] 195 |         if self.expression.is_none() {
[INFO] [stdout]     |         ---------------------------- help: try: `if let Some(<item>) = &self.expression`
[INFO] [stdout] ...
[INFO] [stdout] 198 |             write!(f, "{}", self.expression.as_ref().unwrap())
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap
[INFO] [stdout]     = note: `#[warn(clippy::unnecessary_unwrap)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/parser.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 68 -             return true;
[INFO] [stdout] 68 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/parser.rs:71:13
[INFO] [stdout]    |
[INFO] [stdout] 71 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 71 -             return false;
[INFO] [stdout] 71 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         return program;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 100 -         return program;
[INFO] [stdout] 100 +         program
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]   --> src/parser.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 | /             match self.parse_statement() {
[INFO] [stdout] 95 | |                 Some(statement) => program.statements.push(statement),
[INFO] [stdout] 96 | |                 None => {}
[INFO] [stdout] 97 | |             }
[INFO] [stdout]    | |_____________^ help: try: `if let Some(statement) = self.parse_statement() { program.statements.push(statement) }`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]    = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: name `EOF` contains a capitalized acronym
[INFO] [stdout]  --> src/token.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     EOF,
[INFO] [stdout]   |     ^^^ help: consider making the acronym lowercase, except the initial letter (notice the capitalization): `Eof`
[INFO] [stdout]   |
[INFO] [stdout]   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms
[INFO] [stdout]   = note: `#[warn(clippy::upper_case_acronyms)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: writing `&String` instead of `&str` involves a new object where a slice will do
[INFO] [stdout]   --> src/token.rs:83:42
[INFO] [stdout]    |
[INFO] [stdout] 83 |     pub fn lookup_identifier(identifier: &String) -> TokenType {
[INFO] [stdout]    |                                          ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stdout]    = note: `#[warn(clippy::ptr_arg)]` on by default
[INFO] [stdout] help: change this to
[INFO] [stdout]    |
[INFO] [stdout] 83 ~     pub fn lookup_identifier(identifier: &str) -> TokenType {
[INFO] [stdout] 84 ~         match identifier {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:23:9
[INFO] [stdout]    |
[INFO] [stdout] 23 |         'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_'
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('a'..='z').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout]    = note: `#[warn(clippy::manual_range_contains)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:23:35
[INFO] [stdout]    |
[INFO] [stdout] 23 |         'a' <= ch && ch <= 'z' || 'A' <= ch && ch <= 'Z' || ch == '_'
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('A'..='Z').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]   --> src/lexer.rs:27:9
[INFO] [stdout]    |
[INFO] [stdout] 27 |         '0' <= ch && ch <= '9'
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('0'..='9').contains(&ch)`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_range_contains
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/lexer.rs:121:9
[INFO] [stdout]     |
[INFO] [stdout] 121 |         return token;
[INFO] [stdout]     |         ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout]     = note: `#[warn(clippy::needless_return)]` on by default
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 121 -         return token;
[INFO] [stdout] 121 +         token
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]   --> src/ast.rs:59:61
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub fn to_concrete_statement<T: Clone + 'static>(statement: &Box<dyn Statement>) -> Box<T> {
[INFO] [stdout]    |                                                             ^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Statement`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout]    = note: `#[warn(clippy::borrowed_box)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]   --> src/ast.rs:69:63
[INFO] [stdout]    |
[INFO] [stdout] 69 | pub fn to_concrete_expression<T: Clone + 'static>(expression: &Box<dyn Expression>) -> Box<T> {
[INFO] [stdout]    |                                                               ^^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Expression`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/ast.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 82 |         if self.statements.len() > 0 {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^ help: using `!is_empty` is clearer and more explicit: `!self.statements.is_empty()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout]    = note: `#[warn(clippy::len_zero)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `push_str()` using a single-character string literal
[INFO] [stdout]    --> src/ast.rs:162:9
[INFO] [stdout]     |
[INFO] [stdout] 162 |         out.push_str(";");
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `out.push(';')`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_char_add_str
[INFO] [stdout]     = note: `#[warn(clippy::single_char_add_str)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: called `unwrap` on `self.expression` after checking its variant with `is_none`
[INFO] [stdout]    --> src/ast.rs:198:29
[INFO] [stdout]     |
[INFO] [stdout] 195 |         if self.expression.is_none() {
[INFO] [stdout]     |         ---------------------------- help: try: `if let Some(<item>) = &self.expression`
[INFO] [stdout] ...
[INFO] [stdout] 198 |             write!(f, "{}", self.expression.as_ref().unwrap())
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_unwrap
[INFO] [stdout]     = note: `#[warn(clippy::unnecessary_unwrap)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/parser.rs:68:13
[INFO] [stdout]    |
[INFO] [stdout] 68 |             return true;
[INFO] [stdout]    |             ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 68 -             return true;
[INFO] [stdout] 68 +             true
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]   --> src/parser.rs:71:13
[INFO] [stdout]    |
[INFO] [stdout] 71 |             return false;
[INFO] [stdout]    |             ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]    |
[INFO] [stdout] 71 -             return false;
[INFO] [stdout] 71 +             false
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:100:9
[INFO] [stdout]     |
[INFO] [stdout] 100 |         return program;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 100 -         return program;
[INFO] [stdout] 100 +         program
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]   --> src/parser.rs:94:13
[INFO] [stdout]    |
[INFO] [stdout] 94 | /             match self.parse_statement() {
[INFO] [stdout] 95 | |                 Some(statement) => program.statements.push(statement),
[INFO] [stdout] 96 | |                 None => {}
[INFO] [stdout] 97 | |             }
[INFO] [stdout]    | |_____________^ help: try: `if let Some(statement) = self.parse_statement() { program.statements.push(statement) }`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout]    = note: `#[warn(clippy::single_match)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:262:12
[INFO] [stdout]     |
[INFO] [stdout] 262 |         if errors.len() == 0 {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `errors.is_empty()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_zero
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]    --> src/parser.rs:273:38
[INFO] [stdout]     |
[INFO] [stdout] 273 |     fn test_let_statement(statement: &Box<dyn Statement>, name: &str) -> bool {
[INFO] [stdout]     |                                      ^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Statement`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:280:9
[INFO] [stdout]     |
[INFO] [stdout] 280 |         return true;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 280 -         return true;
[INFO] [stdout] 280 +         true
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stdout]    --> src/parser.rs:283:41
[INFO] [stdout]     |
[INFO] [stdout] 283 |     fn test_integer_literal(expression: &Box<dyn Expression>, value: i64) -> bool {
[INFO] [stdout]     |                                         ^^^^^^^^^^^^^^^^^^^^ help: try: `&dyn Expression`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:288:9
[INFO] [stdout]     |
[INFO] [stdout] 288 |         return true;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stdout] help: remove `return`
[INFO] [stdout]     |
[INFO] [stdout] 288 -         return true;
[INFO] [stdout] 288 +         true
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]    --> src/parser.rs:359:17
[INFO] [stdout]     |
[INFO] [stdout] 359 |         assert!(!expression_statement.expression.is_none());
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `expression_statement.expression.is_some()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#nonminimal_bool
[INFO] [stdout]     = note: `#[warn(clippy::nonminimal_bool)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `Command { std: "docker" "inspect" "01f2de0410a3fc86f43957b3b7ed3e370674335e0ab168c1edef6dfe763e2ac5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01f2de0410a3fc86f43957b3b7ed3e370674335e0ab168c1edef6dfe763e2ac5", kill_on_drop: false }`
[INFO] [stdout] 01f2de0410a3fc86f43957b3b7ed3e370674335e0ab168c1edef6dfe763e2ac5