[INFO] cloning repository https://github.com/edwmorgan/rslox
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/edwmorgan/rslox" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwmorgan%2Frslox", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwmorgan%2Frslox'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9aefcf9a5642849b3f93dc78b1a0a151836dafda
[INFO] linting edwmorgan/rslox against nightly for clippy-nonminimal_bool-denied
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fedwmorgan%2Frslox" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/edwmorgan/rslox
[INFO] finished tweaking git repo https://github.com/edwmorgan/rslox
[INFO] tweaked toml for git repo https://github.com/edwmorgan/rslox written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/edwmorgan/rslox 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/edwmorgan/rslox 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 999d8221b482677400989842a983c297480642a836839935dfd7b287f658dfab
[INFO] running `Command { std: "docker" "start" "-a" "999d8221b482677400989842a983c297480642a836839935dfd7b287f658dfab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "999d8221b482677400989842a983c297480642a836839935dfd7b287f658dfab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "999d8221b482677400989842a983c297480642a836839935dfd7b287f658dfab", kill_on_drop: false }`
[INFO] [stdout] 999d8221b482677400989842a983c297480642a836839935dfd7b287f658dfab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] dd3394822dda011ba992e7ffbf9579f2b3e1991d0bbefd6e5adf1bdf7bd71ea3
[INFO] running `Command { std: "docker" "start" "-a" "dd3394822dda011ba992e7ffbf9579f2b3e1991d0bbefd6e5adf1bdf7bd71ea3", kill_on_drop: false }`
[INFO] [stderr]     Checking rslox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `any`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     any,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenType`
[INFO] [stdout]  --> src/syntax_tree.rs:1:30
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::{scanner::{Token, TokenType}, interpreter::Nil};
[INFO] [stdout]   |                              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/interpreter.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 |     scanner::{Token, TokenType},
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::TypeId`
[INFO] [stdout]  --> src/interpreter.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::any::TypeId;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `any`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     any,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `TokenType`
[INFO] [stdout]  --> src/syntax_tree.rs:1:30
[INFO] [stdout]   |
[INFO] [stdout] 1 | use crate::{scanner::{Token, TokenType}, interpreter::Nil};
[INFO] [stdout]   |                              ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Token`
[INFO] [stdout]  --> src/interpreter.rs:2:15
[INFO] [stdout]   |
[INFO] [stdout] 2 |     scanner::{Token, TokenType},
[INFO] [stdout]   |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::any::TypeId`
[INFO] [stdout]  --> src/interpreter.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use std::any::TypeId;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/interpreter.rs:181:18
[INFO] [stdout]     |
[INFO] [stdout] 181 |             Some(l) => true,
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `literal` is never read
[INFO] [stdout]    --> src/scanner.rs:322:5
[INFO] [stdout]     |
[INFO] [stdout] 319 | pub struct Token {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 322 |     literal: Box<dyn Any>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Identifier` is never constructed
[INFO] [stdout]    --> src/scanner.rs:365:5
[INFO] [stdout]     |
[INFO] [stdout] 338 | pub enum TokenType {
[INFO] [stdout]     |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 365 |     Identifier,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `TokenType` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this boolean expression can be simplified
[INFO] [stdout]   --> src/scanner.rs:33:16
[INFO] [stdout]    |
[INFO] [stdout] 33 |             if !res.is_ok() {
[INFO] [stdout]    |                ^^^^^^^^^^^^ help: try: `res.is_err()`
[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] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | /         Ok(self.tokens.push(Token::new(
[INFO] [stdout] 38 | |             TokenType::Eof,
[INFO] [stdout] 39 | |             "".to_string(),
[INFO] [stdout] 40 | |             Box::new(0),
[INFO] [stdout] 41 | |             self.line,
[INFO] [stdout] 42 | |         )))
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout]    = note: `#[warn(clippy::unit_arg)]` on by default
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 37 ~         self.tokens.push(Token::new(
[INFO] [stdout] 38 +             TokenType::Eof,
[INFO] [stdout] 39 +             "".to_string(),
[INFO] [stdout] 40 +             Box::new(0),
[INFO] [stdout] 41 +             self.line,
[INFO] [stdout] 42 +         ));
[INFO] [stdout] 43 +         Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:49:20
[INFO] [stdout]    |
[INFO] [stdout] 49 |             '(' => Ok(self.add_token(TokenType::LeftParen)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 49 ~             '(' => {
[INFO] [stdout] 50 +                 self.add_token(TokenType::LeftParen);
[INFO] [stdout] 51 +                 Ok(())
[INFO] [stdout] 52 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:50:20
[INFO] [stdout]    |
[INFO] [stdout] 50 |             ')' => Ok(self.add_token(TokenType::RightParen)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 50 ~             ')' => {
[INFO] [stdout] 51 +                 self.add_token(TokenType::RightParen);
[INFO] [stdout] 52 +                 Ok(())
[INFO] [stdout] 53 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:51:20
[INFO] [stdout]    |
[INFO] [stdout] 51 |             '{' => Ok(self.add_token(TokenType::LeftBrace)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 51 ~             '{' => {
[INFO] [stdout] 52 +                 self.add_token(TokenType::LeftBrace);
[INFO] [stdout] 53 +                 Ok(())
[INFO] [stdout] 54 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:52:20
[INFO] [stdout]    |
[INFO] [stdout] 52 |             '}' => Ok(self.add_token(TokenType::RightBrace)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 52 ~             '}' => {
[INFO] [stdout] 53 +                 self.add_token(TokenType::RightBrace);
[INFO] [stdout] 54 +                 Ok(())
[INFO] [stdout] 55 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:53:20
[INFO] [stdout]    |
[INFO] [stdout] 53 |             ',' => Ok(self.add_token(TokenType::Comma)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 53 ~             ',' => {
[INFO] [stdout] 54 +                 self.add_token(TokenType::Comma);
[INFO] [stdout] 55 +                 Ok(())
[INFO] [stdout] 56 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:54:20
[INFO] [stdout]    |
[INFO] [stdout] 54 |             '.' => Ok(self.add_token(TokenType::Dot)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 54 ~             '.' => {
[INFO] [stdout] 55 +                 self.add_token(TokenType::Dot);
[INFO] [stdout] 56 +                 Ok(())
[INFO] [stdout] 57 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:55:20
[INFO] [stdout]    |
[INFO] [stdout] 55 |             '-' => Ok(self.add_token(TokenType::Minus)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 55 ~             '-' => {
[INFO] [stdout] 56 +                 self.add_token(TokenType::Minus);
[INFO] [stdout] 57 +                 Ok(())
[INFO] [stdout] 58 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 |             '+' => Ok(self.add_token(TokenType::Plus)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 56 ~             '+' => {
[INFO] [stdout] 57 +                 self.add_token(TokenType::Plus);
[INFO] [stdout] 58 +                 Ok(())
[INFO] [stdout] 59 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:57:20
[INFO] [stdout]    |
[INFO] [stdout] 57 |             ';' => Ok(self.add_token(TokenType::Semicolon)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 57 ~             ';' => {
[INFO] [stdout] 58 +                 self.add_token(TokenType::Semicolon);
[INFO] [stdout] 59 +                 Ok(())
[INFO] [stdout] 60 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:58:20
[INFO] [stdout]    |
[INFO] [stdout] 58 |             '*' => Ok(self.add_token(TokenType::Star)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 58 ~             '*' => {
[INFO] [stdout] 59 +                 self.add_token(TokenType::Star);
[INFO] [stdout] 60 +                 Ok(())
[INFO] [stdout] 61 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |             '?' => Ok(self.add_token(TokenType::QuestionMark)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 59 ~             '?' => {
[INFO] [stdout] 60 +                 self.add_token(TokenType::QuestionMark);
[INFO] [stdout] 61 +                 Ok(())
[INFO] [stdout] 62 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:60:20
[INFO] [stdout]    |
[INFO] [stdout] 60 |             ':' => Ok(self.add_token(TokenType::Colon)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 60 ~             ':' => {
[INFO] [stdout] 61 +                 self.add_token(TokenType::Colon);
[INFO] [stdout] 62 +                 Ok(())
[INFO] [stdout] 63 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 67 ~                 self.add_token(matched_char);
[INFO] [stdout] 68 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 75 ~                 self.add_token(matched_char);
[INFO] [stdout] 76 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:83:17
[INFO] [stdout]    |
[INFO] [stdout] 83 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 83 ~                 self.add_token(matched_char);
[INFO] [stdout] 84 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:91:17
[INFO] [stdout]    |
[INFO] [stdout] 91 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 91 ~                 self.add_token(matched_char);
[INFO] [stdout] 92 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression assigns a bool literal
[INFO] [stdout]    --> src/scanner.rs:109:32
[INFO] [stdout]     |
[INFO] [stdout] 109 |                           } else if self.peek() == '*' {
[INFO] [stdout]     |  ________________________________^
[INFO] [stdout] 110 | |                             star_found = true;
[INFO] [stdout] 111 | |                         } else {
[INFO] [stdout] 112 | |                             star_found = false;
[INFO] [stdout] 113 | |                         }
[INFO] [stdout]     | |_________________________^ help: you can reduce it to: `{ star_found = self.peek() == '*'; }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool_assign
[INFO] [stdout]     = note: `#[warn(clippy::needless_bool_assign)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]    --> src/scanner.rs:120:21
[INFO] [stdout]     |
[INFO] [stdout] 120 |                     Ok(self.add_token(TokenType::Slash))
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]     |
[INFO] [stdout] 120 ~                     self.add_token(TokenType::Slash);
[INFO] [stdout] 121 +                     Ok(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]    --> src/scanner.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |             '\n' => Ok(self.line += 1),
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]     |
[INFO] [stdout] 125 ~             '\n' => {
[INFO] [stdout] 126 +                 let _: () = self.line += 1;
[INFO] [stdout] 127 +                 Ok(())
[INFO] [stdout] 128 ~             },
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/scanner.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |         return res;
[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] 177 -         return res;
[INFO] [stdout] 177 +         res
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]    --> src/scanner.rs:282:5
[INFO] [stdout]     |
[INFO] [stdout] 282 |     c >= '0' && c <= '9'
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: use: `('0'..='9').contains(&c)`
[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/scanner.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 286 |     (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_')
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('a'..='z').contains(&c)`
[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/scanner.rs:286:31
[INFO] [stdout]     |
[INFO] [stdout] 286 |     (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_')
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('A'..='Z').contains(&c)`
[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/scanner.rs:315:5
[INFO] [stdout]     |
[INFO] [stdout] 315 |     return reserved_identifiers;
[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] 315 -     return reserved_identifiers;
[INFO] [stdout] 315 +     reserved_identifiers
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/syntax_tree.rs:20:35
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Expr::StringLiteral(v) => format!("{}", v),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `v.to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout]    = note: `#[warn(clippy::useless_format)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/syntax_tree.rs:24:31
[INFO] [stdout]    |
[INFO] [stdout] 24 |         Expr::NilLiteral() => format!("nil"),
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"nil".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/parser.rs:35:30
[INFO] [stdout]    |
[INFO] [stdout] 35 |                 Ok(_) => Err(format!("Unable to parse rhs of ternary.")),
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"Unable to parse rhs of ternary.".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/parser.rs:55:20
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 if p.tokens.len() == 0 {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     if p.tokens.len() == 0 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:121:8
[INFO] [stdout]     |
[INFO] [stdout] 121 |     if p.tokens.len() == 0 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:145:24
[INFO] [stdout]     |
[INFO] [stdout] 145 |                     if p.tokens.len() == 0 {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     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] 179 -     return false;
[INFO] [stdout] 179 +     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/interpreter.rs:23:33
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     None => Err(format!("failed to convert value to f64")),
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"failed to convert value to f64".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]    --> src/interpreter.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |         Err(format!("left value is not a numeric type."))
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"left value is not a numeric type.".to_string()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `l`
[INFO] [stdout]    --> src/interpreter.rs:181:18
[INFO] [stdout]     |
[INFO] [stdout] 181 |             Some(l) => true,
[INFO] [stdout]     |                  ^ help: if this is intentional, prefix it with an underscore: `_l`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `literal` is never read
[INFO] [stdout]    --> src/scanner.rs:322:5
[INFO] [stdout]     |
[INFO] [stdout] 319 | pub struct Token {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 322 |     literal: Box<dyn Any>,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Token` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `Identifier` is never constructed
[INFO] [stdout]    --> src/scanner.rs:365:5
[INFO] [stdout]     |
[INFO] [stdout] 338 | pub enum TokenType {
[INFO] [stdout]     |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 365 |     Identifier,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `TokenType` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `.type_id()` on `Box<dyn Any>`
[INFO] [stdout]    --> src/interpreter.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     if (*left_value).type_id() == (*right_value).type_id() {
[INFO] [stdout]     |        -------------^^^^^^^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        help: consider dereferencing first: `(*(*left_value))`
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the type id of the literal type `Box<_>` instead of the type id of the boxed value, which is most likely not what you want
[INFO] [stdout]     = note: if this is intentional, use `TypeId::of::<Box<dyn Any>>()` instead, which makes it more clear
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_id_on_box
[INFO] [stdout]     = note: `#[warn(clippy::type_id_on_box)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `.type_id()` on `Box<dyn Any>`
[INFO] [stdout]    --> src/interpreter.rs:166:35
[INFO] [stdout]     |
[INFO] [stdout] 166 |     if (*left_value).type_id() == (*right_value).type_id() {
[INFO] [stdout]     |                                   --------------^^^^^^^^^^
[INFO] [stdout]     |                                   |
[INFO] [stdout]     |                                   help: consider dereferencing first: `(*(*right_value))`
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the type id of the literal type `Box<_>` instead of the type id of the boxed value, which is most likely not what you want
[INFO] [stdout]     = note: if this is intentional, use `TypeId::of::<Box<dyn Any>>()` instead, which makes it more clear
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_id_on_box
[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/interpreter.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 | /         match (*left_value).downcast_ref::<f64>() {
[INFO] [stdout] 169 | |             Some(l) => return *l == *(right_value).downcast_ref::<f64>().unwrap(),
[INFO] [stdout] 170 | |             None => (),
[INFO] [stdout] 171 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<f64>() { return *l == *(right_value).downcast_ref::<f64>().unwrap() }`
[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: this boolean expression can be simplified
[INFO] [stdout]   --> src/scanner.rs:33:16
[INFO] [stdout]    |
[INFO] [stdout] 33 |             if !res.is_ok() {
[INFO] [stdout]    |                ^^^^^^^^^^^^ help: try: `res.is_err()`
[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] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 | /         Ok(self.tokens.push(Token::new(
[INFO] [stdout] 38 | |             TokenType::Eof,
[INFO] [stdout] 39 | |             "".to_string(),
[INFO] [stdout] 40 | |             Box::new(0),
[INFO] [stdout] 41 | |             self.line,
[INFO] [stdout] 42 | |         )))
[INFO] [stdout]    | |___________^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout]    = note: `#[warn(clippy::unit_arg)]` on by default
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 37 ~         self.tokens.push(Token::new(
[INFO] [stdout] 38 +             TokenType::Eof,
[INFO] [stdout] 39 +             "".to_string(),
[INFO] [stdout] 40 +             Box::new(0),
[INFO] [stdout] 41 +             self.line,
[INFO] [stdout] 42 +         ));
[INFO] [stdout] 43 +         Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:49:20
[INFO] [stdout]    |
[INFO] [stdout] 49 |             '(' => Ok(self.add_token(TokenType::LeftParen)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 49 ~             '(' => {
[INFO] [stdout] 50 +                 self.add_token(TokenType::LeftParen);
[INFO] [stdout] 51 +                 Ok(())
[INFO] [stdout] 52 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:50:20
[INFO] [stdout]    |
[INFO] [stdout] 50 |             ')' => Ok(self.add_token(TokenType::RightParen)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 50 ~             ')' => {
[INFO] [stdout] 51 +                 self.add_token(TokenType::RightParen);
[INFO] [stdout] 52 +                 Ok(())
[INFO] [stdout] 53 ~             },
[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/interpreter.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | /         match (*left_value).downcast_ref::<bool>() {
[INFO] [stdout] 173 | |             Some(l) => return *l == *(right_value).downcast_ref::<bool>().unwrap(),
[INFO] [stdout] 174 | |             None => (),
[INFO] [stdout] 175 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<bool>() { return *l == *(right_value).downcast_ref::<bool>().unwrap() }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[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/interpreter.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 | /         match (*left_value).downcast_ref::<String>() {
[INFO] [stdout] 177 | |             Some(l) => return *l == *(right_value).downcast_ref::<String>().unwrap(),
[INFO] [stdout] 178 | |             None => (),
[INFO] [stdout] 179 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<String>() { return *l == *(right_value).downcast_ref::<String>().unwrap() }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:51:20
[INFO] [stdout]    |
[INFO] [stdout] 51 |             '{' => Ok(self.add_token(TokenType::LeftBrace)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 51 ~             '{' => {
[INFO] [stdout] 52 +                 self.add_token(TokenType::LeftBrace);
[INFO] [stdout] 53 +                 Ok(())
[INFO] [stdout] 54 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:52:20
[INFO] [stdout]    |
[INFO] [stdout] 52 |             '}' => Ok(self.add_token(TokenType::RightBrace)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 52 ~             '}' => {
[INFO] [stdout] 53 +                 self.add_token(TokenType::RightBrace);
[INFO] [stdout] 54 +                 Ok(())
[INFO] [stdout] 55 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:53:20
[INFO] [stdout]    |
[INFO] [stdout] 53 |             ',' => Ok(self.add_token(TokenType::Comma)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 53 ~             ',' => {
[INFO] [stdout] 54 +                 self.add_token(TokenType::Comma);
[INFO] [stdout] 55 +                 Ok(())
[INFO] [stdout] 56 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:54:20
[INFO] [stdout]    |
[INFO] [stdout] 54 |             '.' => Ok(self.add_token(TokenType::Dot)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 54 ~             '.' => {
[INFO] [stdout] 55 +                 self.add_token(TokenType::Dot);
[INFO] [stdout] 56 +                 Ok(())
[INFO] [stdout] 57 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:55:20
[INFO] [stdout]    |
[INFO] [stdout] 55 |             '-' => Ok(self.add_token(TokenType::Minus)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 55 ~             '-' => {
[INFO] [stdout] 56 +                 self.add_token(TokenType::Minus);
[INFO] [stdout] 57 +                 Ok(())
[INFO] [stdout] 58 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:56:20
[INFO] [stdout]    |
[INFO] [stdout] 56 |             '+' => Ok(self.add_token(TokenType::Plus)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 56 ~             '+' => {
[INFO] [stdout] 57 +                 self.add_token(TokenType::Plus);
[INFO] [stdout] 58 +                 Ok(())
[INFO] [stdout] 59 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:57:20
[INFO] [stdout]    |
[INFO] [stdout] 57 |             ';' => Ok(self.add_token(TokenType::Semicolon)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 57 ~             ';' => {
[INFO] [stdout] 58 +                 self.add_token(TokenType::Semicolon);
[INFO] [stdout] 59 +                 Ok(())
[INFO] [stdout] 60 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:58:20
[INFO] [stdout]    |
[INFO] [stdout] 58 |             '*' => Ok(self.add_token(TokenType::Star)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 58 ~             '*' => {
[INFO] [stdout] 59 +                 self.add_token(TokenType::Star);
[INFO] [stdout] 60 +                 Ok(())
[INFO] [stdout] 61 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |             '?' => Ok(self.add_token(TokenType::QuestionMark)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 59 ~             '?' => {
[INFO] [stdout] 60 +                 self.add_token(TokenType::QuestionMark);
[INFO] [stdout] 61 +                 Ok(())
[INFO] [stdout] 62 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:60:20
[INFO] [stdout]    |
[INFO] [stdout] 60 |             ':' => Ok(self.add_token(TokenType::Colon)),
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 60 ~             ':' => {
[INFO] [stdout] 61 +                 self.add_token(TokenType::Colon);
[INFO] [stdout] 62 +                 Ok(())
[INFO] [stdout] 63 ~             },
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:67:17
[INFO] [stdout]    |
[INFO] [stdout] 67 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 67 ~                 self.add_token(matched_char);
[INFO] [stdout] 68 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]   --> src/lib.rs:27:39
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Box::new(Expr::IntLiteral(123 as i64)),
[INFO] [stdout]    |                                       ^^^^^^^^^^ help: try: `123_i64`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: empty string literal in `println!`
[INFO] [stdout]   --> src/lib.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |             println!("");
[INFO] [stdout]    |             ^^^^^^^^^--^
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      help: remove the empty string
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stdout]    = note: `#[warn(clippy::println_empty_string)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded unit return type
[INFO] [stdout]   --> src/lib.rs:60:36
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn run_file(file_path: &String) -> () {
[INFO] [stdout]    |                                    ^^^^^^ help: remove the `-> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stdout]    = note: `#[warn(clippy::unused_unit)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:75:17
[INFO] [stdout]    |
[INFO] [stdout] 75 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 75 ~                 self.add_token(matched_char);
[INFO] [stdout] 76 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:83:17
[INFO] [stdout]    |
[INFO] [stdout] 83 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 83 ~                 self.add_token(matched_char);
[INFO] [stdout] 84 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]   --> src/scanner.rs:91:17
[INFO] [stdout]    |
[INFO] [stdout] 91 |                 Ok(self.add_token(matched_char))
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]    |
[INFO] [stdout] 91 ~                 self.add_token(matched_char);
[INFO] [stdout] 92 +                 Ok(())
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `RsLox`
[INFO] [stdout]   --> src/lib.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | /     pub fn new() -> Self {
[INFO] [stdout] 85 | |         RsLox { had_error: false }
[INFO] [stdout] 86 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout]    = note: `#[warn(clippy::new_without_default)]` on by default
[INFO] [stdout] help: try adding this
[INFO] [stdout]    |
[INFO] [stdout] 83 + impl Default for RsLox {
[INFO] [stdout] 84 +     fn default() -> Self {
[INFO] [stdout] 85 +         Self::new()
[INFO] [stdout] 86 +     }
[INFO] [stdout] 87 + }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this if-then-else expression assigns a bool literal
[INFO] [stdout]    --> src/scanner.rs:109:32
[INFO] [stdout]     |
[INFO] [stdout] 109 |                           } else if self.peek() == '*' {
[INFO] [stdout]     |  ________________________________^
[INFO] [stdout] 110 | |                             star_found = true;
[INFO] [stdout] 111 | |                         } else {
[INFO] [stdout] 112 | |                             star_found = false;
[INFO] [stdout] 113 | |                         }
[INFO] [stdout]     | |_________________________^ help: you can reduce it to: `{ star_found = self.peek() == '*'; }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool_assign
[INFO] [stdout]     = note: `#[warn(clippy::needless_bool_assign)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]    --> src/scanner.rs:120:21
[INFO] [stdout]     |
[INFO] [stdout] 120 |                     Ok(self.add_token(TokenType::Slash))
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]     |
[INFO] [stdout] 120 ~                     self.add_token(TokenType::Slash);
[INFO] [stdout] 121 +                     Ok(())
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: passing a unit value to a function
[INFO] [stdout]    --> src/scanner.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |             '\n' => Ok(self.line += 1),
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unit_arg
[INFO] [stdout] help: move the expression in front of the call and replace it with the unit literal `()`
[INFO] [stdout]     |
[INFO] [stdout] 125 ~             '\n' => {
[INFO] [stdout] 126 +                 let _: () = self.line += 1;
[INFO] [stdout] 127 +                 Ok(())
[INFO] [stdout] 128 ~             },
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded `return` statement
[INFO] [stdout]    --> src/scanner.rs:177:9
[INFO] [stdout]     |
[INFO] [stdout] 177 |         return res;
[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] 177 -         return res;
[INFO] [stdout] 177 +         res
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: manual `RangeInclusive::contains` implementation
[INFO] [stdout]    --> src/scanner.rs:282:5
[INFO] [stdout]     |
[INFO] [stdout] 282 |     c >= '0' && c <= '9'
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^ help: use: `('0'..='9').contains(&c)`
[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/scanner.rs:286:5
[INFO] [stdout]     |
[INFO] [stdout] 286 |     (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_')
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('a'..='z').contains(&c)`
[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/scanner.rs:286:31
[INFO] [stdout]     |
[INFO] [stdout] 286 |     (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c == '_')
[INFO] [stdout]     |                               ^^^^^^^^^^^^^^^^^^^^^^ help: use: `('A'..='Z').contains(&c)`
[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/scanner.rs:315:5
[INFO] [stdout]     |
[INFO] [stdout] 315 |     return reserved_identifiers;
[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] 315 -     return reserved_identifiers;
[INFO] [stdout] 315 +     reserved_identifiers
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/syntax_tree.rs:20:35
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Expr::StringLiteral(v) => format!("{}", v),
[INFO] [stdout]    |                                   ^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `v.to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout]    = note: `#[warn(clippy::useless_format)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/syntax_tree.rs:24:31
[INFO] [stdout]    |
[INFO] [stdout] 24 |         Expr::NilLiteral() => format!("nil"),
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"nil".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/parser.rs:35:30
[INFO] [stdout]    |
[INFO] [stdout] 35 |                 Ok(_) => Err(format!("Unable to parse rhs of ternary.")),
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"Unable to parse rhs of ternary.".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: length comparison to zero
[INFO] [stdout]   --> src/parser.rs:55:20
[INFO] [stdout]    |
[INFO] [stdout] 55 |                 if p.tokens.len() == 0 {
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:103:8
[INFO] [stdout]     |
[INFO] [stdout] 103 |     if p.tokens.len() == 0 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:121:8
[INFO] [stdout]     |
[INFO] [stdout] 121 |     if p.tokens.len() == 0 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: length comparison to zero
[INFO] [stdout]    --> src/parser.rs:145:24
[INFO] [stdout]     |
[INFO] [stdout] 145 |                     if p.tokens.len() == 0 {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^^^^^^^ help: using `is_empty` is clearer and more explicit: `p.tokens.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: unneeded `return` statement
[INFO] [stdout]    --> src/parser.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     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] 179 -     return false;
[INFO] [stdout] 179 +     false
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]   --> src/interpreter.rs:23:33
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     None => Err(format!("failed to convert value to f64")),
[INFO] [stdout]    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"failed to convert value to f64".to_string()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: useless use of `format!`
[INFO] [stdout]    --> src/interpreter.rs:124:13
[INFO] [stdout]     |
[INFO] [stdout] 124 |         Err(format!("left value is not a numeric type."))
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"left value is not a numeric type.".to_string()`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#useless_format
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `.type_id()` on `Box<dyn Any>`
[INFO] [stdout]    --> src/interpreter.rs:166:8
[INFO] [stdout]     |
[INFO] [stdout] 166 |     if (*left_value).type_id() == (*right_value).type_id() {
[INFO] [stdout]     |        -------------^^^^^^^^^^
[INFO] [stdout]     |        |
[INFO] [stdout]     |        help: consider dereferencing first: `(*(*left_value))`
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the type id of the literal type `Box<_>` instead of the type id of the boxed value, which is most likely not what you want
[INFO] [stdout]     = note: if this is intentional, use `TypeId::of::<Box<dyn Any>>()` instead, which makes it more clear
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_id_on_box
[INFO] [stdout]     = note: `#[warn(clippy::type_id_on_box)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calling `.type_id()` on `Box<dyn Any>`
[INFO] [stdout]    --> src/interpreter.rs:166:35
[INFO] [stdout]     |
[INFO] [stdout] 166 |     if (*left_value).type_id() == (*right_value).type_id() {
[INFO] [stdout]     |                                   --------------^^^^^^^^^^
[INFO] [stdout]     |                                   |
[INFO] [stdout]     |                                   help: consider dereferencing first: `(*(*right_value))`
[INFO] [stdout]     |
[INFO] [stdout]     = note: this returns the type id of the literal type `Box<_>` instead of the type id of the boxed value, which is most likely not what you want
[INFO] [stdout]     = note: if this is intentional, use `TypeId::of::<Box<dyn Any>>()` instead, which makes it more clear
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_id_on_box
[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/interpreter.rs:168:9
[INFO] [stdout]     |
[INFO] [stdout] 168 | /         match (*left_value).downcast_ref::<f64>() {
[INFO] [stdout] 169 | |             Some(l) => return *l == *(right_value).downcast_ref::<f64>().unwrap(),
[INFO] [stdout] 170 | |             None => (),
[INFO] [stdout] 171 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<f64>() { return *l == *(right_value).downcast_ref::<f64>().unwrap() }`
[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: you seem to be trying to use `match` for destructuring a single pattern. Consider using `if let`
[INFO] [stdout]    --> src/interpreter.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | /         match (*left_value).downcast_ref::<bool>() {
[INFO] [stdout] 173 | |             Some(l) => return *l == *(right_value).downcast_ref::<bool>().unwrap(),
[INFO] [stdout] 174 | |             None => (),
[INFO] [stdout] 175 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<bool>() { return *l == *(right_value).downcast_ref::<bool>().unwrap() }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[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/interpreter.rs:176:9
[INFO] [stdout]     |
[INFO] [stdout] 176 | /         match (*left_value).downcast_ref::<String>() {
[INFO] [stdout] 177 | |             Some(l) => return *l == *(right_value).downcast_ref::<String>().unwrap(),
[INFO] [stdout] 178 | |             None => (),
[INFO] [stdout] 179 | |         };
[INFO] [stdout]     | |_________^ help: try: `if let Some(l) = (*left_value).downcast_ref::<String>() { return *l == *(right_value).downcast_ref::<String>().unwrap() }`
[INFO] [stdout]     |
[INFO] [stdout]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_match
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: casting integer literal to `i64` is unnecessary
[INFO] [stdout]   --> src/lib.rs:27:39
[INFO] [stdout]    |
[INFO] [stdout] 27 |             Box::new(Expr::IntLiteral(123 as i64)),
[INFO] [stdout]    |                                       ^^^^^^^^^^ help: try: `123_i64`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast
[INFO] [stdout]    = note: `#[warn(clippy::unnecessary_cast)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: empty string literal in `println!`
[INFO] [stdout]   --> src/lib.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |             println!("");
[INFO] [stdout]    |             ^^^^^^^^^--^
[INFO] [stdout]    |                      |
[INFO] [stdout]    |                      help: remove the empty string
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
[INFO] [stdout]    = note: `#[warn(clippy::println_empty_string)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unneeded unit return type
[INFO] [stdout]   --> src/lib.rs:60:36
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub fn run_file(file_path: &String) -> () {
[INFO] [stdout]    |                                    ^^^^^^ help: remove the `-> ()`
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
[INFO] [stdout]    = note: `#[warn(clippy::unused_unit)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: you should consider adding a `Default` implementation for `RsLox`
[INFO] [stdout]   --> src/lib.rs:84:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | /     pub fn new() -> Self {
[INFO] [stdout] 85 | |         RsLox { had_error: false }
[INFO] [stdout] 86 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default
[INFO] [stdout]    = note: `#[warn(clippy::new_without_default)]` on by default
[INFO] [stdout] help: try adding this
[INFO] [stdout]    |
[INFO] [stdout] 83 + impl Default for RsLox {
[INFO] [stdout] 84 +     fn default() -> Self {
[INFO] [stdout] 85 +         Self::new()
[INFO] [stdout] 86 +     }
[INFO] [stdout] 87 + }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.43s
[INFO] running `Command { std: "docker" "inspect" "dd3394822dda011ba992e7ffbf9579f2b3e1991d0bbefd6e5adf1bdf7bd71ea3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd3394822dda011ba992e7ffbf9579f2b3e1991d0bbefd6e5adf1bdf7bd71ea3", kill_on_drop: false }`
[INFO] [stdout] dd3394822dda011ba992e7ffbf9579f2b3e1991d0bbefd6e5adf1bdf7bd71ea3