[INFO] cloning repository https://github.com/sulabhkatila/Lost
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sulabhkatila/Lost" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsulabhkatila%2FLost", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsulabhkatila%2FLost'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eb5380a007b92e6cb636214609f5d6e38b04da8a
[INFO] checking sulabhkatila/Lost against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsulabhkatila%2FLost" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sulabhkatila/Lost on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sulabhkatila/Lost
[INFO] finished tweaking git repo https://github.com/sulabhkatila/Lost
[INFO] tweaked toml for git repo https://github.com/sulabhkatila/Lost written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sulabhkatila/Lost 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0542500e8d890731ddbeacf09f6033958f1326045e88b0453c8d7d16f3fff606
[INFO] running `Command { std: "docker" "start" "-a" "0542500e8d890731ddbeacf09f6033958f1326045e88b0453c8d7d16f3fff606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0542500e8d890731ddbeacf09f6033958f1326045e88b0453c8d7d16f3fff606", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0542500e8d890731ddbeacf09f6033958f1326045e88b0453c8d7d16f3fff606", kill_on_drop: false }`
[INFO] [stdout] 0542500e8d890731ddbeacf09f6033958f1326045e88b0453c8d7d16f3fff606
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac7e5c2cd1f7709328ff5ceca4ffed39aef1ffd2b5a376234ed6b96b24c2d64f
[INFO] running `Command { std: "docker" "start" "-a" "ac7e5c2cd1f7709328ff5ceca4ffed39aef1ffd2b5a376234ed6b96b24c2d64f", kill_on_drop: false }`
[INFO] [stderr]     Checking lost v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/parser/stmt.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::expr::{self, *};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `default`, and `self`
[INFO] [stdout]  --> src/parser/parser.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     default,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 4 |     io::{self, Write},
[INFO] [stdout]   |          ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/parser/parser.rs:247:19
[INFO] [stdout]     |
[INFO] [stdout] 247 |         } else if (self.match_next(vec![TokenType::Var])) {
[INFO] [stdout]     |                   ^                                     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 247 -         } else if (self.match_next(vec![TokenType::Var])) {
[INFO] [stdout] 247 +         } else if self.match_next(vec![TokenType::Var]) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/interpreter/interpreter.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Ref, RefCell},
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `collections::HashMap`, `time::Instant`, and `write`
[INFO] [stdout]   --> src/interpreter/types.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     collections::HashMap,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 15 |     fmt::{self, write},
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout] 16 |     rc::Rc,
[INFO] [stdout] 17 |     time::Instant,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]   --> src/interpreter/types.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |     environment::{self, Environment},
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/parser/stmt.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use super::expr::{self, *};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Write`, `default`, and `self`
[INFO] [stdout]  --> src/parser/parser.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 |     default,
[INFO] [stdout]   |     ^^^^^^^
[INFO] [stdout] 4 |     io::{self, Write},
[INFO] [stdout]   |          ^^^^  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/parser/parser.rs:247:19
[INFO] [stdout]     |
[INFO] [stdout] 247 |         } else if (self.match_next(vec![TokenType::Var])) {
[INFO] [stdout]     |                   ^                                     ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 247 -         } else if (self.match_next(vec![TokenType::Var])) {
[INFO] [stdout] 247 +         } else if self.match_next(vec![TokenType::Var]) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Ref`
[INFO] [stdout]  --> src/interpreter/interpreter.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 |     cell::{Ref, RefCell},
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `collections::HashMap`, `time::Instant`, and `write`
[INFO] [stdout]   --> src/interpreter/types.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     collections::HashMap,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 15 |     fmt::{self, write},
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout] 16 |     rc::Rc,
[INFO] [stdout] 17 |     time::Instant,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]   --> src/interpreter/types.rs:23:19
[INFO] [stdout]    |
[INFO] [stdout] 23 |     environment::{self, Environment},
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `borrow::BorrowMut`
[INFO] [stdout]  --> src/interpreter/interpreter.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     borrow::BorrowMut,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `closing_paren`
[INFO] [stdout]   --> src/parser/astprinter.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         closing_paren: &Token,
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closing_paren`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `starting_brace`
[INFO] [stdout]    --> src/parser/parser.rs:136:13
[INFO] [stdout]     |
[INFO] [stdout] 136 |         let starting_brace = self.consume(
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_starting_brace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `borrow::BorrowMut`
[INFO] [stdout]  --> src/interpreter/interpreter.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     borrow::BorrowMut,
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `initializer` is never read
[INFO] [stdout]    --> src/parser/parser.rs:244:17
[INFO] [stdout]     |
[INFO] [stdout] 244 |         let mut initializer: Option<Stmt> = None;
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `equals`
[INFO] [stdout]    --> src/parser/parser.rs:418:17
[INFO] [stdout]     |
[INFO] [stdout] 418 |             let equals = self.previous();
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_equals`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser/parser.rs:526:13
[INFO] [stdout]     |
[INFO] [stdout] 526 |         let mut error = None;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `closing_paren`
[INFO] [stdout]   --> src/parser/astprinter.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |         closing_paren: &Token,
[INFO] [stdout]    |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_closing_paren`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:103:28
[INFO] [stdout]     |
[INFO] [stdout] 103 |             Type::Function(fun) => todo!(),
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:104:34
[INFO] [stdout]     |
[INFO] [stdout] 104 |             Type::NativeFunction(fun) => todo!(),
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `class`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:105:25
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Type::Class(class) => todo!(),
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `instance`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:106:28
[INFO] [stdout]     |
[INFO] [stdout] 106 |             Type::Instance(instance) => todo!(),
[INFO] [stdout]     |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_instance`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:118:28
[INFO] [stdout]     |
[INFO] [stdout] 118 |             Type::Function(fun) => todo!(),
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:119:34
[INFO] [stdout]     |
[INFO] [stdout] 119 |             Type::NativeFunction(fun) => todo!(),
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `class`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:120:25
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Type::Class(class) => todo!(),
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `instance`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:121:28
[INFO] [stdout]     |
[INFO] [stdout] 121 |             Type::Instance(instance) => todo!(),
[INFO] [stdout]     |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_instance`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:436:9
[INFO] [stdout]     |
[INFO] [stdout] 436 |         statements: &mut Box<Vec<Stmt>>,
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:543:32
[INFO] [stdout]     |
[INFO] [stdout] 543 |     fn visit_return(&mut self, token: &Token, expr: &Box<Expr>) -> Result<Option<Type>, Error> {
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_token`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `starting_brace`
[INFO] [stdout]    --> src/parser/parser.rs:136:13
[INFO] [stdout]     |
[INFO] [stdout] 136 |         let starting_brace = self.consume(
[INFO] [stdout]     |             ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_starting_brace`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/interpreter/types.rs:78:14
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let (name, parameters, body) = match &mut *self.declaration.borrow_mut() {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/interpreter/types.rs:135:13
[INFO] [stdout]     |
[INFO] [stdout] 135 |         let res = (self.to_call)();
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `interpreter`
[INFO] [stdout]    --> src/interpreter/types.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 132 |         interpreter: &mut Interpreter,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_interpreter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]    --> src/interpreter/types.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |         arguments: Option<Vec<Type>>,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `interpreter`
[INFO] [stdout]    --> src/interpreter/types.rs:183:9
[INFO] [stdout]     |
[INFO] [stdout] 183 |         interpreter: &mut Interpreter,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_interpreter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `initializer` is never read
[INFO] [stdout]    --> src/parser/parser.rs:244:17
[INFO] [stdout]     |
[INFO] [stdout] 244 |         let mut initializer: Option<Stmt> = None;
[INFO] [stdout]     |                 ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]    --> src/interpreter/types.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |         arguments: Option<Vec<Type>>,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `equals`
[INFO] [stdout]    --> src/parser/parser.rs:418:17
[INFO] [stdout]     |
[INFO] [stdout] 418 |             let equals = self.previous();
[INFO] [stdout]     |                 ^^^^^^ help: if this is intentional, prefix it with an underscore: `_equals`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/interpreter/interpreter.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 | /         self.environment
[INFO] [stdout] 444 | |             .deref()
[INFO] [stdout] 445 | |             .borrow_mut()
[INFO] [stdout] 446 | |             .assign(name, Type::Class(class));
[INFO] [stdout]     | |_____________________________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 443 |         let _ = self.environment
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/parser/parser.rs:526:13
[INFO] [stdout]     |
[INFO] [stdout] 526 |         let mut error = None;
[INFO] [stdout]     |             ----^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:103:28
[INFO] [stdout]     |
[INFO] [stdout] 103 |             Type::Function(fun) => todo!(),
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:104:34
[INFO] [stdout]     |
[INFO] [stdout] 104 |             Type::NativeFunction(fun) => todo!(),
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `class`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:105:25
[INFO] [stdout]     |
[INFO] [stdout] 105 |             Type::Class(class) => todo!(),
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `instance`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:106:28
[INFO] [stdout]     |
[INFO] [stdout] 106 |             Type::Instance(instance) => todo!(),
[INFO] [stdout]     |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_instance`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:118:28
[INFO] [stdout]     |
[INFO] [stdout] 118 |             Type::Function(fun) => todo!(),
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fun`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:119:34
[INFO] [stdout]     |
[INFO] [stdout] 119 |             Type::NativeFunction(fun) => todo!(),
[INFO] [stdout]     |                                  ^^^ help: if this is intentional, prefix it with an underscore: `_fun`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `class`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:120:25
[INFO] [stdout]     |
[INFO] [stdout] 120 |             Type::Class(class) => todo!(),
[INFO] [stdout]     |                         ^^^^^ help: if this is intentional, prefix it with an underscore: `_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `instance`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:121:28
[INFO] [stdout]     |
[INFO] [stdout] 121 |             Type::Instance(instance) => todo!(),
[INFO] [stdout]     |                            ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_instance`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:436:9
[INFO] [stdout]     |
[INFO] [stdout] 436 |         statements: &mut Box<Vec<Stmt>>,
[INFO] [stdout]     |         ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `token`
[INFO] [stdout]    --> src/interpreter/interpreter.rs:543:32
[INFO] [stdout]     |
[INFO] [stdout] 543 |     fn visit_return(&mut self, token: &Token, expr: &Box<Expr>) -> Result<Option<Type>, Error> {
[INFO] [stdout]     |                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_token`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/interpreter/types.rs:78:14
[INFO] [stdout]    |
[INFO] [stdout] 78 |         let (name, parameters, body) = match &mut *self.declaration.borrow_mut() {
[INFO] [stdout]    |              ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/interpreter/types.rs:135:13
[INFO] [stdout]     |
[INFO] [stdout] 135 |         let res = (self.to_call)();
[INFO] [stdout]     |             ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `interpreter`
[INFO] [stdout]    --> src/interpreter/types.rs:132:9
[INFO] [stdout]     |
[INFO] [stdout] 132 |         interpreter: &mut Interpreter,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_interpreter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]    --> src/interpreter/types.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |         arguments: Option<Vec<Type>>,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `interpreter`
[INFO] [stdout]    --> src/interpreter/types.rs:183:9
[INFO] [stdout]     |
[INFO] [stdout] 183 |         interpreter: &mut Interpreter,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_interpreter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]    --> src/interpreter/types.rs:184:9
[INFO] [stdout]     |
[INFO] [stdout] 184 |         arguments: Option<Vec<Type>>,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/interpreter/interpreter.rs:443:9
[INFO] [stdout]     |
[INFO] [stdout] 443 | /         self.environment
[INFO] [stdout] 444 | |             .deref()
[INFO] [stdout] 445 | |             .borrow_mut()
[INFO] [stdout] 446 | |             .assign(name, Type::Class(class));
[INFO] [stdout]     | |_____________________________________________^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 443 |         let _ = self.environment
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 29 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ast_printer`
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let ast_printer = AstPrinter;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ast_printer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ast_printer`
[INFO] [stdout]   --> src/main.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 78 |     let ast_printer = AstPrinter;
[INFO] [stdout]    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ast_printer`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.71s
[INFO] running `Command { std: "docker" "inspect" "ac7e5c2cd1f7709328ff5ceca4ffed39aef1ffd2b5a376234ed6b96b24c2d64f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac7e5c2cd1f7709328ff5ceca4ffed39aef1ffd2b5a376234ed6b96b24c2d64f", kill_on_drop: false }`
[INFO] [stdout] ac7e5c2cd1f7709328ff5ceca4ffed39aef1ffd2b5a376234ed6b96b24c2d64f