[INFO] cloning repository https://github.com/MountainSnowGifu/lox-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MountainSnowGifu/lox-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMountainSnowGifu%2Flox-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMountainSnowGifu%2Flox-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0dbdc60578fc41837405e38add70cbe2e1302637
[INFO] checking MountainSnowGifu/lox-rust/0dbdc60578fc41837405e38add70cbe2e1302637 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMountainSnowGifu%2Flox-rust" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MountainSnowGifu/lox-rust on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MountainSnowGifu/lox-rust
[INFO] finished tweaking git repo https://github.com/MountainSnowGifu/lox-rust
[INFO] tweaked toml for git repo https://github.com/MountainSnowGifu/lox-rust written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/MountainSnowGifu/lox-rust 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" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5f67ebd78cb93f2818a50f8ececff462cc677c26fa401337bdb11699910ec6d0
[INFO] running `Command { std: "docker" "start" "-a" "5f67ebd78cb93f2818a50f8ececff462cc677c26fa401337bdb11699910ec6d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5f67ebd78cb93f2818a50f8ececff462cc677c26fa401337bdb11699910ec6d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f67ebd78cb93f2818a50f8ececff462cc677c26fa401337bdb11699910ec6d0", kill_on_drop: false }`
[INFO] [stdout] 5f67ebd78cb93f2818a50f8ececff462cc677c26fa401337bdb11699910ec6d0
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0dceb5ada15e627110c925f313376061b288ddd9303eca554960c832f57cf513
[INFO] running `Command { std: "docker" "start" "-a" "0dceb5ada15e627110c925f313376061b288ddd9303eca554960c832f57cf513", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_lox v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:57:34
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn visit_variable(&mut self, name: &Token) -> String {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:61:32
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn visit_assign(&mut self, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/ast_printer.rs:61:46
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn visit_assign(&mut self, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/ast_printer.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                 ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `operator`
[INFO] [stdout]   --> src/ast_printer.rs:65:46
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_operator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/ast_printer.rs:65:64
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `callee`
[INFO] [stdout]   --> src/ast_printer.rs:69:30
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_callee`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `paren`
[INFO] [stdout]   --> src/ast_printer.rs:69:45
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_paren`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]   --> src/ast_printer.rs:69:60
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `object`
[INFO] [stdout]   --> src/ast_printer.rs:73:29
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn visit_get(&mut self, object: &Expr, name: &Token) -> String {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_object`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:73:44
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn visit_get(&mut self, object: &Expr, name: &Token) -> String {
[INFO] [stdout]    |                                            ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `object`
[INFO] [stdout]   --> src/ast_printer.rs:77:29
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_object`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:77:44
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                            ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/ast_printer.rs:77:58
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]   --> src/ast_printer.rs:81:30
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn visit_this(&mut self, keyword: &Token) -> String {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]   --> src/ast_printer.rs:85:31
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn visit_super(&mut self, keyword: &Token, method: &Token) -> String {
[INFO] [stdout]    |                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `method`
[INFO] [stdout]   --> src/ast_printer.rs:85:48
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn visit_super(&mut self, keyword: &Token, method: &Token) -> String {
[INFO] [stdout]    |                                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_method`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:102:34
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn visit_var_stmt(&mut self, name: &Token, initializer: &Expr) -> String {
[INFO] [stdout]     |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `initializer`
[INFO] [stdout]    --> src/ast_printer.rs:102:48
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn visit_var_stmt(&mut self, name: &Token, initializer: &Expr) -> String {
[INFO] [stdout]     |                                                ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_initializer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> src/ast_printer.rs:106:36
[INFO] [stdout]     |
[INFO] [stdout] 106 |     fn visit_block_stmt(&mut self, statements: &[Stmt]) -> String {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `condition`
[INFO] [stdout]    --> src/ast_printer.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         condition: &Expr,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_condition`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `then_branch`
[INFO] [stdout]    --> src/ast_printer.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |         then_branch: &Stmt,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_then_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `else_branch`
[INFO] [stdout]    --> src/ast_printer.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         else_branch: &Option<Box<Stmt>>,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_else_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `condition`
[INFO] [stdout]    --> src/ast_printer.rs:119:36
[INFO] [stdout]     |
[INFO] [stdout] 119 |     fn visit_while_stmt(&mut self, condition: &Expr, body: &Stmt) -> String {
[INFO] [stdout]     |                                    ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_condition`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/ast_printer.rs:119:54
[INFO] [stdout]     |
[INFO] [stdout] 119 |     fn visit_while_stmt(&mut self, condition: &Expr, body: &Stmt) -> String {
[INFO] [stdout]     |                                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:123:39
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `params`
[INFO] [stdout]    --> src/ast_printer.rs:123:53
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_params`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/ast_printer.rs:123:71
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]    --> src/ast_printer.rs:127:37
[INFO] [stdout]     |
[INFO] [stdout] 127 |     fn visit_return_stmt(&mut self, keyword: &Token, value: &Expr) -> String {
[INFO] [stdout]     |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ast_printer.rs:127:54
[INFO] [stdout]     |
[INFO] [stdout] 127 |     fn visit_return_stmt(&mut self, keyword: &Token, value: &Expr) -> String {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |         name: &Token,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `super_class`
[INFO] [stdout]    --> src/ast_printer.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |         super_class: &Option<Expr>,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_super_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `methods`
[INFO] [stdout]    --> src/ast_printer.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         methods: &[Stmt],
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_methods`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `result`
[INFO] [stdout]    --> src/interpreter.rs:432:13
[INFO] [stdout]     |
[INFO] [stdout] 432 |         let result = self.evaluate(expression)?;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:57:34
[INFO] [stdout]    |
[INFO] [stdout] 57 |     fn visit_variable(&mut self, name: &Token) -> String {
[INFO] [stdout]    |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:61:32
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn visit_assign(&mut self, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/ast_printer.rs:61:46
[INFO] [stdout]    |
[INFO] [stdout] 61 |     fn visit_assign(&mut self, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `left`
[INFO] [stdout]   --> src/ast_printer.rs:65:33
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                 ^^^^ help: if this is intentional, prefix it with an underscore: `_left`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `operator`
[INFO] [stdout]   --> src/ast_printer.rs:65:46
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                              ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_operator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right`
[INFO] [stdout]   --> src/ast_printer.rs:65:64
[INFO] [stdout]    |
[INFO] [stdout] 65 |     fn visit_logical(&mut self, left: &Expr, operator: &Token, right: &Expr) -> String {
[INFO] [stdout]    |                                                                ^^^^^ help: if this is intentional, prefix it with an underscore: `_right`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `callee`
[INFO] [stdout]   --> src/ast_printer.rs:69:30
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                              ^^^^^^ help: if this is intentional, prefix it with an underscore: `_callee`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `paren`
[INFO] [stdout]   --> src/ast_printer.rs:69:45
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_paren`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arguments`
[INFO] [stdout]   --> src/ast_printer.rs:69:60
[INFO] [stdout]    |
[INFO] [stdout] 69 |     fn visit_call(&mut self, callee: &Expr, paren: &Token, arguments: &[Expr]) -> String {
[INFO] [stdout]    |                                                            ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_arguments`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `object`
[INFO] [stdout]   --> src/ast_printer.rs:73:29
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn visit_get(&mut self, object: &Expr, name: &Token) -> String {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_object`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:73:44
[INFO] [stdout]    |
[INFO] [stdout] 73 |     fn visit_get(&mut self, object: &Expr, name: &Token) -> String {
[INFO] [stdout]    |                                            ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `object`
[INFO] [stdout]   --> src/ast_printer.rs:77:29
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_object`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]   --> src/ast_printer.rs:77:44
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                            ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/ast_printer.rs:77:58
[INFO] [stdout]    |
[INFO] [stdout] 77 |     fn visit_set(&mut self, object: &Expr, name: &Token, value: &Expr) -> String {
[INFO] [stdout]    |                                                          ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]   --> src/ast_printer.rs:81:30
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn visit_this(&mut self, keyword: &Token) -> String {
[INFO] [stdout]    |                              ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]   --> src/ast_printer.rs:85:31
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn visit_super(&mut self, keyword: &Token, method: &Token) -> String {
[INFO] [stdout]    |                               ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `method`
[INFO] [stdout]   --> src/ast_printer.rs:85:48
[INFO] [stdout]    |
[INFO] [stdout] 85 |     fn visit_super(&mut self, keyword: &Token, method: &Token) -> String {
[INFO] [stdout]    |                                                ^^^^^^ help: if this is intentional, prefix it with an underscore: `_method`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:102:34
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn visit_var_stmt(&mut self, name: &Token, initializer: &Expr) -> String {
[INFO] [stdout]     |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `initializer`
[INFO] [stdout]    --> src/ast_printer.rs:102:48
[INFO] [stdout]     |
[INFO] [stdout] 102 |     fn visit_var_stmt(&mut self, name: &Token, initializer: &Expr) -> String {
[INFO] [stdout]     |                                                ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_initializer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statements`
[INFO] [stdout]    --> src/ast_printer.rs:106:36
[INFO] [stdout]     |
[INFO] [stdout] 106 |     fn visit_block_stmt(&mut self, statements: &[Stmt]) -> String {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statements`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `condition`
[INFO] [stdout]    --> src/ast_printer.rs:112:9
[INFO] [stdout]     |
[INFO] [stdout] 112 |         condition: &Expr,
[INFO] [stdout]     |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_condition`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `then_branch`
[INFO] [stdout]    --> src/ast_printer.rs:113:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |         then_branch: &Stmt,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_then_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `else_branch`
[INFO] [stdout]    --> src/ast_printer.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         else_branch: &Option<Box<Stmt>>,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_else_branch`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `condition`
[INFO] [stdout]    --> src/ast_printer.rs:119:36
[INFO] [stdout]     |
[INFO] [stdout] 119 |     fn visit_while_stmt(&mut self, condition: &Expr, body: &Stmt) -> String {
[INFO] [stdout]     |                                    ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_condition`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/ast_printer.rs:119:54
[INFO] [stdout]     |
[INFO] [stdout] 119 |     fn visit_while_stmt(&mut self, condition: &Expr, body: &Stmt) -> String {
[INFO] [stdout]     |                                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:123:39
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `params`
[INFO] [stdout]    --> src/ast_printer.rs:123:53
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                                     ^^^^^^ help: if this is intentional, prefix it with an underscore: `_params`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `body`
[INFO] [stdout]    --> src/ast_printer.rs:123:71
[INFO] [stdout]     |
[INFO] [stdout] 123 |     fn visit_function_stmt(&mut self, name: &Token, params: &[Token], body: &[Stmt]) -> String {
[INFO] [stdout]     |                                                                       ^^^^ help: if this is intentional, prefix it with an underscore: `_body`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `keyword`
[INFO] [stdout]    --> src/ast_printer.rs:127:37
[INFO] [stdout]     |
[INFO] [stdout] 127 |     fn visit_return_stmt(&mut self, keyword: &Token, value: &Expr) -> String {
[INFO] [stdout]     |                                     ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_keyword`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]    --> src/ast_printer.rs:127:54
[INFO] [stdout]     |
[INFO] [stdout] 127 |     fn visit_return_stmt(&mut self, keyword: &Token, value: &Expr) -> String {
[INFO] [stdout]     |                                                      ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `name`
[INFO] [stdout]    --> src/ast_printer.rs:133:9
[INFO] [stdout]     |
[INFO] [stdout] 133 |         name: &Token,
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_name`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `super_class`
[INFO] [stdout]    --> src/ast_printer.rs:134:9
[INFO] [stdout]     |
[INFO] [stdout] 134 |         super_class: &Option<Expr>,
[INFO] [stdout]     |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_super_class`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `methods`
[INFO] [stdout]    --> src/ast_printer.rs:135:9
[INFO] [stdout]     |
[INFO] [stdout] 135 |         methods: &[Stmt],
[INFO] [stdout]     |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_methods`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_prompt` is never used
[INFO] [stdout]   --> src/main.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn run_prompt() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `print` and `print_statements` are never used
[INFO] [stdout]   --> src/ast_printer.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl AstPrinter {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 11 |     pub fn print(&mut self, expr: Expr) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn print_statements(&mut self, statements: Vec<Stmt>) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_values` is never used
[INFO] [stdout]   --> src/environment.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Environment {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 89 |     pub fn print_values(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/error.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ParseError(String),
[INFO] [stdout]   |     ---------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ParseError(()),
[INFO] [stdout]   |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/error.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 |     RuntimeError(Token, String),
[INFO] [stdout]   |     ------------ ^^^^^  ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 7 |     RuntimeError((), ()),
[INFO] [stdout]   |                  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/error.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ResolveError(Token, String),
[INFO] [stdout]   |     ------------ ^^^^^  ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ResolveError((), ()),
[INFO] [stdout]   |                  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/parser.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct ParserError(String);
[INFO] [stdout]    |            ----------- ^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `ParserError` 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: unused variable: `result`
[INFO] [stdout]    --> src/interpreter.rs:432:13
[INFO] [stdout]     |
[INFO] [stdout] 432 |         let result = self.evaluate(expression)?;
[INFO] [stdout]     |             ^^^^^^ help: if this is intentional, prefix it with an underscore: `_result`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/parser.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             self.consume(TokenType::IDENTIFIER, "Expect superclass name.");
[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] 59 |             let _ = self.consume(TokenType::IDENTIFIER, "Expect superclass name.");
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_prompt` is never used
[INFO] [stdout]   --> src/main.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn run_prompt() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `print` and `print_statements` are never used
[INFO] [stdout]   --> src/ast_printer.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | impl AstPrinter {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 11 |     pub fn print(&mut self, expr: Expr) -> String {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 15 |     pub fn print_statements(&mut self, statements: Vec<Stmt>) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_values` is never used
[INFO] [stdout]   --> src/environment.rs:89:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Environment {
[INFO] [stdout]    | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 89 |     pub fn print_values(&self) {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> src/error.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ParseError(String),
[INFO] [stdout]   |     ---------- ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 6 |     ParseError(()),
[INFO] [stdout]   |                ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/error.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 |     RuntimeError(Token, String),
[INFO] [stdout]   |     ------------ ^^^^^  ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 7 |     RuntimeError((), ()),
[INFO] [stdout]   |                  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]  --> src/error.rs:8:18
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ResolveError(Token, String),
[INFO] [stdout]   |     ------------ ^^^^^  ^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     fields in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `Error` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]   |
[INFO] [stdout] 8 |     ResolveError((), ()),
[INFO] [stdout]   |                  ~~  ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/parser.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct ParserError(String);
[INFO] [stdout]    |            ----------- ^^^^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            field in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing this field
[INFO] [stdout]    = note: `ParserError` 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: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/parser.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             self.consume(TokenType::IDENTIFIER, "Expect superclass name.");
[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] 59 |             let _ = self.consume(TokenType::IDENTIFIER, "Expect superclass name.");
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 42 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.39s
[INFO] running `Command { std: "docker" "inspect" "0dceb5ada15e627110c925f313376061b288ddd9303eca554960c832f57cf513", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0dceb5ada15e627110c925f313376061b288ddd9303eca554960c832f57cf513", kill_on_drop: false }`
[INFO] [stdout] 0dceb5ada15e627110c925f313376061b288ddd9303eca554960c832f57cf513