[INFO] updating cached repository https://github.com/jeppester/rust-interpreter
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a0cb161b195ca09befd2735b39111b4de0533d23
[INFO] checking jeppester/rust-interpreter against master#fdc0011561c6365c596dfd8fa1ef388162bc89c7 for pr-66504-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeppester%2Frust-interpreter" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jeppester/rust-interpreter on toolchain fdc0011561c6365c596dfd8fa1ef388162bc89c7
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jeppester/rust-interpreter
[INFO] finished tweaking git repo https://github.com/jeppester/rust-interpreter
[INFO] tweaked toml for git repo https://github.com/jeppester/rust-interpreter written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/jeppester/rust-interpreter already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+fdc0011561c6365c596dfd8fa1ef388162bc89c7" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 68a38a51dd2369e13a476bb4b2679a8e0678f54491640d9e42e545b8cfe4eeb0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "68a38a51dd2369e13a476bb4b2679a8e0678f54491640d9e42e545b8cfe4eeb0"`
[INFO] [stderr]     Checking monkey-interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `token`
[INFO] [stderr]    --> src/parser/mod.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |     let token = self.current_token.clone();
[INFO] [stderr]     |         ^^^^^ help: consider prefixing with an underscore: `_token`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `precedence`
[INFO] [stderr]    --> src/parser/mod.rs:181:38
[INFO] [stderr]     |
[INFO] [stderr] 181 |   pub fn parse_expression(&mut self, precedence: Precedence) -> Option<Expression> {
[INFO] [stderr]     |                                      ^^^^^^^^^^ help: consider prefixing with an underscore: `_precedence`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lexer/mod.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |     let mut token;
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `token`
[INFO] [stderr]    --> src/parser/mod.rs:167:9
[INFO] [stderr]     |
[INFO] [stderr] 167 |     let token = self.current_token.clone();
[INFO] [stderr]     |         ^^^^^ help: consider prefixing with an underscore: `_token`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `precedence`
[INFO] [stderr]    --> src/parser/mod.rs:181:38
[INFO] [stderr]     |
[INFO] [stderr] 181 |   pub fn parse_expression(&mut self, precedence: Precedence) -> Option<Expression> {
[INFO] [stderr]     |                                      ^^^^^^^^^^ help: consider prefixing with an underscore: `_precedence`
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Precedence`
[INFO] [stderr]   --> src/parser/mod.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub type Precedence = u8;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LOWEST`
[INFO] [stderr]   --> src/parser/mod.rs:18:3
[INFO] [stderr]    |
[INFO] [stderr] 18 |   pub const LOWEST: u8 = 0;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `EQUALS`
[INFO] [stderr]   --> src/parser/mod.rs:19:3
[INFO] [stderr]    |
[INFO] [stderr] 19 |   pub const EQUALS: u8 = 1;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LESS_OR_GREATER`
[INFO] [stderr]   --> src/parser/mod.rs:20:3
[INFO] [stderr]    |
[INFO] [stderr] 20 |   pub const LESS_OR_GREATER: u8 = 2;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `SUM`
[INFO] [stderr]   --> src/parser/mod.rs:21:3
[INFO] [stderr]    |
[INFO] [stderr] 21 |   pub const SUM: u8 = 3;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PRODUCT`
[INFO] [stderr]   --> src/parser/mod.rs:22:3
[INFO] [stderr]    |
[INFO] [stderr] 22 |   pub const PRODUCT: u8 = 4;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PREFIX`
[INFO] [stderr]   --> src/parser/mod.rs:23:3
[INFO] [stderr]    |
[INFO] [stderr] 23 |   pub const PREFIX: u8 = 5;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:24:3
[INFO] [stderr]    |
[INFO] [stderr] 24 |   pub const CALL: u8 = 6;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Parser`
[INFO] [stderr]   --> src/parser/mod.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub struct Parser {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_identifier`
[INFO] [stderr]   --> src/parser/mod.rs:36:8
[INFO] [stderr]    |
[INFO] [stderr] 36 | pub fn parse_identifier(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_integer_literal`
[INFO] [stderr]   --> src/parser/mod.rs:46:8
[INFO] [stderr]    |
[INFO] [stderr] 46 | pub fn parse_integer_literal(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/parser/mod.rs:66:3
[INFO] [stderr]    |
[INFO] [stderr] 66 |   pub fn new(mut lexer: Lexer) -> Self {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `next_token`
[INFO] [stderr]   --> src/parser/mod.rs:85:3
[INFO] [stderr]    |
[INFO] [stderr] 85 |   pub fn next_token(&mut self) {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_program`
[INFO] [stderr]   --> src/parser/mod.rs:91:3
[INFO] [stderr]    |
[INFO] [stderr] 91 |   pub fn parse_program(&mut self) -> Program {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_statement`
[INFO] [stderr]    --> src/parser/mod.rs:118:3
[INFO] [stderr]     |
[INFO] [stderr] 118 |   pub fn parse_statement(&mut self) -> Option<Node> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_let_statement`
[INFO] [stderr]    --> src/parser/mod.rs:126:3
[INFO] [stderr]     |
[INFO] [stderr] 126 |   pub fn parse_let_statement(&mut self) -> Option<Node> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_return_statement`
[INFO] [stderr]    --> src/parser/mod.rs:154:3
[INFO] [stderr]     |
[INFO] [stderr] 154 |   pub fn parse_return_statement(&mut self) -> Option<Node> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_expression_statement`
[INFO] [stderr]    --> src/parser/mod.rs:166:3
[INFO] [stderr]     |
[INFO] [stderr] 166 |   pub fn parse_expression_statement(&mut self) -> Option<Node> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_expression`
[INFO] [stderr]    --> src/parser/mod.rs:181:3
[INFO] [stderr]     |
[INFO] [stderr] 181 |   pub fn parse_expression(&mut self, precedence: Precedence) -> Option<Expression> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `current_token_is`
[INFO] [stderr]    --> src/parser/mod.rs:193:3
[INFO] [stderr]     |
[INFO] [stderr] 193 |   pub fn current_token_is(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_token_is`
[INFO] [stderr]    --> src/parser/mod.rs:197:3
[INFO] [stderr]     |
[INFO] [stderr] 197 |   pub fn peek_token_is(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `expect_peek`
[INFO] [stderr]    --> src/parser/mod.rs:201:3
[INFO] [stderr]     |
[INFO] [stderr] 201 |   pub fn expect_peek(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_error`
[INFO] [stderr]    --> src/parser/mod.rs:211:3
[INFO] [stderr]     |
[INFO] [stderr] 211 |   pub fn peek_error(&mut self, token_type: TokenType) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_prefix`
[INFO] [stderr]    --> src/parser/mod.rs:219:3
[INFO] [stderr]     |
[INFO] [stderr] 219 | /   pub fn register_prefix(
[INFO] [stderr] 220 | |     &mut self,
[INFO] [stderr] 221 | |     token_type: TokenType,
[INFO] [stderr] 222 | |     parser_function: fn(&mut Parser) -> Option<Expression>,
[INFO] [stderr] ...   |
[INFO] [stderr] 226 | |       .insert(token_type, parser_function);
[INFO] [stderr] 227 | |   }
[INFO] [stderr]     | |___^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:229:3
[INFO] [stderr]     |
[INFO] [stderr] 229 | /   pub fn register_infix(
[INFO] [stderr] 230 | |     &mut self,
[INFO] [stderr] 231 | |     token_type: TokenType,
[INFO] [stderr] 232 | |     parser_function: fn(&mut Parser, Expression) -> Option<Expression>,
[INFO] [stderr] ...   |
[INFO] [stderr] 236 | |       .insert(token_type, parser_function);
[INFO] [stderr] 237 | |   }
[INFO] [stderr]     | |___^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LetStatement`
[INFO] [stderr]  --> src/ast/let_statement.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub struct LetStatement {
[INFO] [stderr]   |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ReturnStatement`
[INFO] [stderr]  --> src/ast/return_statement.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct ReturnStatement {
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Identifier`
[INFO] [stderr]  --> src/ast/identifier.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct Identifier {
[INFO] [stderr]   |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `IntegerLiteral`
[INFO] [stderr]  --> src/ast/integer_literal.rs:3:12
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct IntegerLiteral {
[INFO] [stderr]   |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ExpressionStatement`
[INFO] [stderr]  --> src/ast/expression_statement.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct ExpressionStatement {
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 | pub enum Expression {
[INFO] [stderr]    |          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:23:3
[INFO] [stderr]    |
[INFO] [stderr] 23 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/mod.rs:30:3
[INFO] [stderr]    |
[INFO] [stderr] 30 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Statement`
[INFO] [stderr]   --> src/ast/mod.rs:38:10
[INFO] [stderr]    |
[INFO] [stderr] 38 | pub enum Statement {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:45:3
[INFO] [stderr]    |
[INFO] [stderr] 45 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lexer/mod.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |     let mut token;
[INFO] [stderr]     |         ----^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/mod.rs:53:3
[INFO] [stderr]    |
[INFO] [stderr] 53 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Node`
[INFO] [stderr]   --> src/ast/mod.rs:90:10
[INFO] [stderr]    |
[INFO] [stderr] 90 | pub enum Node {
[INFO] [stderr]    |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:96:3
[INFO] [stderr]    |
[INFO] [stderr] 96 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]    --> src/ast/mod.rs:103:3
[INFO] [stderr]     |
[INFO] [stderr] 103 |   pub fn to_string(&self) -> String {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Program`
[INFO] [stderr]    --> src/ast/mod.rs:111:12
[INFO] [stderr]     |
[INFO] [stderr] 111 | pub struct Program {
[INFO] [stderr]     |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]    --> src/ast/mod.rs:116:3
[INFO] [stderr]     |
[INFO] [stderr] 116 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]    --> src/ast/mod.rs:125:3
[INFO] [stderr]     |
[INFO] [stderr] 125 |   pub fn to_string(&self) -> String {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `EQUALS`
[INFO] [stderr]   --> src/parser/mod.rs:19:3
[INFO] [stderr]    |
[INFO] [stderr] 19 |   pub const EQUALS: u8 = 1;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `LESS_OR_GREATER`
[INFO] [stderr]   --> src/parser/mod.rs:20:3
[INFO] [stderr]    |
[INFO] [stderr] 20 |   pub const LESS_OR_GREATER: u8 = 2;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `SUM`
[INFO] [stderr]   --> src/parser/mod.rs:21:3
[INFO] [stderr]    |
[INFO] [stderr] 21 |   pub const SUM: u8 = 3;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PRODUCT`
[INFO] [stderr]   --> src/parser/mod.rs:22:3
[INFO] [stderr]    |
[INFO] [stderr] 22 |   pub const PRODUCT: u8 = 4;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PREFIX`
[INFO] [stderr]   --> src/parser/mod.rs:23:3
[INFO] [stderr]    |
[INFO] [stderr] 23 |   pub const PREFIX: u8 = 5;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:24:3
[INFO] [stderr]    |
[INFO] [stderr] 24 |   pub const CALL: u8 = 6;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:229:3
[INFO] [stderr]     |
[INFO] [stderr] 229 | /   pub fn register_infix(
[INFO] [stderr] 230 | |     &mut self,
[INFO] [stderr] 231 | |     token_type: TokenType,
[INFO] [stderr] 232 | |     parser_function: fn(&mut Parser, Expression) -> Option<Expression>,
[INFO] [stderr] ...   |
[INFO] [stderr] 236 | |       .insert(token_type, parser_function);
[INFO] [stderr] 237 | |   }
[INFO] [stderr]     | |___^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ExpressionStatement`
[INFO] [stderr]   --> src/ast/mod.rs:41:3
[INFO] [stderr]    |
[INFO] [stderr] 41 |   ExpressionStatement(ExpressionStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]    --> src/ast/mod.rs:116:3
[INFO] [stderr]     |
[INFO] [stderr] 116 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
[INFO] running `"docker" "inspect" "68a38a51dd2369e13a476bb4b2679a8e0678f54491640d9e42e545b8cfe4eeb0"`
[INFO] running `"docker" "rm" "-f" "68a38a51dd2369e13a476bb4b2679a8e0678f54491640d9e42e545b8cfe4eeb0"`
[INFO] [stdout] 68a38a51dd2369e13a476bb4b2679a8e0678f54491640d9e42e545b8cfe4eeb0