[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] [stderr] From https://github.com/jeppester/rust-interpreter
[INFO] [stderr]    9f32c1a..4205bb0  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4205bb0d7aa4c1c93c3de535f79eb10b54ded8d8
[INFO] checking jeppester/rust-interpreter against master#914adf04af1c1a984707f778da3d04590c03d144 for pr-72331
[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 914adf04af1c1a984707f778da3d04590c03d144
[INFO] running `"/workspace/cargo-home/bin/cargo" "+914adf04af1c1a984707f778da3d04590c03d144" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jeppester/rust-interpreter
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[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" "+914adf04af1c1a984707f778da3d04590c03d144" "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" "+914adf04af1c1a984707f778da3d04590c03d144" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0915116ed0fff4a7817723b2823bd2946ee2c9ffe18dbb82136b1dc970b9f513
[INFO] running `"docker" "start" "-a" "0915116ed0fff4a7817723b2823bd2946ee2c9ffe18dbb82136b1dc970b9f513"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking monkey-interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/lexer/mod.rs:68:7
[INFO] [stderr]    |
[INFO] [stderr] 68 |       ('0' <= ch && ch <= '9')
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]   --> src/lexer/mod.rs:68:7
[INFO] [stderr]    |
[INFO] [stderr] 68 |       ('0' <= ch && ch <= '9')
[INFO] [stderr]    |       ^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `Precedence`
[INFO] [stderr]   --> src/parser/mod.rs:28:1
[INFO] [stderr]    |
[INFO] [stderr] 28 | pub type Precedence = u8;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `LOWEST`
[INFO] [stderr]   --> src/parser/mod.rs:31:3
[INFO] [stderr]    |
[INFO] [stderr] 31 |   pub const LOWEST: u8 = 0;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `EQUALS`
[INFO] [stderr]   --> src/parser/mod.rs:32:3
[INFO] [stderr]    |
[INFO] [stderr] 32 |   pub const EQUALS: u8 = 1;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `LESS_OR_GREATER`
[INFO] [stderr]   --> src/parser/mod.rs:33:3
[INFO] [stderr]    |
[INFO] [stderr] 33 |   pub const LESS_OR_GREATER: u8 = 2;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `SUM`
[INFO] [stderr]   --> src/parser/mod.rs:34:3
[INFO] [stderr]    |
[INFO] [stderr] 34 |   pub const SUM: u8 = 3;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `PRODUCT`
[INFO] [stderr]   --> src/parser/mod.rs:35:3
[INFO] [stderr]    |
[INFO] [stderr] 35 |   pub const PRODUCT: u8 = 4;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `PREFIX`
[INFO] [stderr]   --> src/parser/mod.rs:36:3
[INFO] [stderr]    |
[INFO] [stderr] 36 |   pub const PREFIX: u8 = 5;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:37:3
[INFO] [stderr]    |
[INFO] [stderr] 37 |   pub const CALL: u8 = 6;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `get_operator_precedence`
[INFO] [stderr]   --> src/parser/mod.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 | pub fn get_operator_precedence(token_type: TokenType) -> Precedence {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Parser`
[INFO] [stderr]   --> src/parser/mod.rs:54:12
[INFO] [stderr]    |
[INFO] [stderr] 54 | pub struct Parser {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_boolean`
[INFO] [stderr]   --> src/parser/mod.rs:65:8
[INFO] [stderr]    |
[INFO] [stderr] 65 | pub fn parse_boolean(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_identifier`
[INFO] [stderr]   --> src/parser/mod.rs:72:8
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn parse_identifier(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_integer_literal`
[INFO] [stderr]   --> src/parser/mod.rs:82:8
[INFO] [stderr]    |
[INFO] [stderr] 82 | pub fn parse_integer_literal(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_prefix_expression`
[INFO] [stderr]   --> src/parser/mod.rs:93:8
[INFO] [stderr]    |
[INFO] [stderr] 93 | pub fn parse_prefix_expression(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_infix_expression`
[INFO] [stderr]    --> src/parser/mod.rs:108:8
[INFO] [stderr]     |
[INFO] [stderr] 108 | pub fn parse_infix_expression(
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_grouped_expression`
[INFO] [stderr]    --> src/parser/mod.rs:128:8
[INFO] [stderr]     |
[INFO] [stderr] 128 | pub fn parse_grouped_expression(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_if_expression`
[INFO] [stderr]    --> src/parser/mod.rs:137:8
[INFO] [stderr]     |
[INFO] [stderr] 137 | pub fn parse_if_expression(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_function_literal`
[INFO] [stderr]    --> src/parser/mod.rs:167:8
[INFO] [stderr]     |
[INFO] [stderr] 167 | pub fn parse_function_literal(parser: &mut Parser) -> Result<Expression, ParserError> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]    --> src/parser/mod.rs:186:10
[INFO] [stderr]     |
[INFO] [stderr] 186 |   pub fn new(mut lexer: Lexer) -> Self {
[INFO] [stderr]     |          ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `next_token`
[INFO] [stderr]    --> src/parser/mod.rs:223:10
[INFO] [stderr]     |
[INFO] [stderr] 223 |   pub fn next_token(&mut self) {
[INFO] [stderr]     |          ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_program`
[INFO] [stderr]    --> src/parser/mod.rs:229:10
[INFO] [stderr]     |
[INFO] [stderr] 229 |   pub fn parse_program(&mut self) -> Program {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_block_statement`
[INFO] [stderr]    --> src/parser/mod.rs:257:10
[INFO] [stderr]     |
[INFO] [stderr] 257 |   pub fn parse_block_statement(&mut self) -> BlockStatement {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_statement`
[INFO] [stderr]    --> src/parser/mod.rs:280:10
[INFO] [stderr]     |
[INFO] [stderr] 280 |   pub fn parse_statement(&mut self) -> Result<Statement, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_let_statement`
[INFO] [stderr]    --> src/parser/mod.rs:288:10
[INFO] [stderr]     |
[INFO] [stderr] 288 |   pub fn parse_let_statement(&mut self) -> Result<Statement, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_return_statement`
[INFO] [stderr]    --> src/parser/mod.rs:316:10
[INFO] [stderr]     |
[INFO] [stderr] 316 |   pub fn parse_return_statement(&mut self) -> Result<Statement, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_expression_statement`
[INFO] [stderr]    --> src/parser/mod.rs:335:10
[INFO] [stderr]     |
[INFO] [stderr] 335 |   pub fn parse_expression_statement(&mut self) -> Result<Statement, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_expression`
[INFO] [stderr]    --> src/parser/mod.rs:345:10
[INFO] [stderr]     |
[INFO] [stderr] 345 |   pub fn parse_expression(&mut self, precedence: Precedence) -> Result<Expression, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_function_arguments`
[INFO] [stderr]    --> src/parser/mod.rs:371:10
[INFO] [stderr]     |
[INFO] [stderr] 371 |   pub fn parse_function_arguments(&mut self) -> Result<Vec<Identifier>, ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `current_token_is`
[INFO] [stderr]    --> src/parser/mod.rs:399:10
[INFO] [stderr]     |
[INFO] [stderr] 399 |   pub fn current_token_is(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek_token_is`
[INFO] [stderr]    --> src/parser/mod.rs:403:10
[INFO] [stderr]     |
[INFO] [stderr] 403 |   pub fn peek_token_is(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `expect_peek`
[INFO] [stderr]    --> src/parser/mod.rs:407:10
[INFO] [stderr]     |
[INFO] [stderr] 407 |   pub fn expect_peek(&mut self, token_type: TokenType) -> Result<(), ParserError> {
[INFO] [stderr]     |          ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `current_precedence`
[INFO] [stderr]    --> src/parser/mod.rs:421:10
[INFO] [stderr]     |
[INFO] [stderr] 421 |   pub fn current_precedence(&mut self) -> Precedence {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `peek_precedence`
[INFO] [stderr]    --> src/parser/mod.rs:425:10
[INFO] [stderr]     |
[INFO] [stderr] 425 |   pub fn peek_precedence(&mut self) -> Precedence {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `prefix_parser_function_for`
[INFO] [stderr]    --> src/parser/mod.rs:429:10
[INFO] [stderr]     |
[INFO] [stderr] 429 |   pub fn prefix_parser_function_for(
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `register_prefix`
[INFO] [stderr]    --> src/parser/mod.rs:441:10
[INFO] [stderr]     |
[INFO] [stderr] 441 |   pub fn register_prefix(
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:451:10
[INFO] [stderr]     |
[INFO] [stderr] 451 |   pub fn register_infix(
[INFO] [stderr]     |          ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/block_statement.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/block_statement.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/boolean_literal.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/boolean_literal.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/function_literal.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/function_literal.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/identifier.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/identifier.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/if_expression.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/if_expression.rs:18:10
[INFO] [stderr]    |
[INFO] [stderr] 18 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/infix_expression.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/infix_expression.rs:17:10
[INFO] [stderr]    |
[INFO] [stderr] 17 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/integer_literal.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/integer_literal.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/let_statement.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/let_statement.rs:18:10
[INFO] [stderr]    |
[INFO] [stderr] 18 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/prefix_expression.rs:12:10
[INFO] [stderr]    |
[INFO] [stderr] 12 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/prefix_expression.rs:16:10
[INFO] [stderr]    |
[INFO] [stderr] 16 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/return_statement.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/return_statement.rs:15:10
[INFO] [stderr]    |
[INFO] [stderr] 15 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BooleanLiteral`
[INFO] [stderr]   --> src/ast/mod.rs:29:3
[INFO] [stderr]    |
[INFO] [stderr] 29 |   BooleanLiteral(BooleanLiteral),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Identifier`
[INFO] [stderr]   --> src/ast/mod.rs:30:3
[INFO] [stderr]    |
[INFO] [stderr] 30 |   Identifier(Identifier),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IntegerLiteral`
[INFO] [stderr]   --> src/ast/mod.rs:31:3
[INFO] [stderr]    |
[INFO] [stderr] 31 |   IntegerLiteral(IntegerLiteral),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `PrefixExpression`
[INFO] [stderr]   --> src/ast/mod.rs:32:3
[INFO] [stderr]    |
[INFO] [stderr] 32 |   PrefixExpression(PrefixExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `InfixExpression`
[INFO] [stderr]   --> src/ast/mod.rs:33:3
[INFO] [stderr]    |
[INFO] [stderr] 33 |   InfixExpression(InfixExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IfExpression`
[INFO] [stderr]   --> src/ast/mod.rs:34:3
[INFO] [stderr]    |
[INFO] [stderr] 34 |   IfExpression(IfExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `FunctionLiteral`
[INFO] [stderr]   --> src/ast/mod.rs:35:3
[INFO] [stderr]    |
[INFO] [stderr] 35 |   FunctionLiteral(FunctionLiteral),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:39:10
[INFO] [stderr]    |
[INFO] [stderr] 39 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/mod.rs:51:10
[INFO] [stderr]    |
[INFO] [stderr] 51 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LetStatement`
[INFO] [stderr]   --> src/ast/mod.rs:66:3
[INFO] [stderr]    |
[INFO] [stderr] 66 |   LetStatement(LetStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ReturnStatement`
[INFO] [stderr]   --> src/ast/mod.rs:67:3
[INFO] [stderr]    |
[INFO] [stderr] 67 |   ReturnStatement(ReturnStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:68:3
[INFO] [stderr]    |
[INFO] [stderr] 68 |   Expression(Expression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlockStatement`
[INFO] [stderr]   --> src/ast/mod.rs:69:3
[INFO] [stderr]    |
[INFO] [stderr] 69 |   BlockStatement(BlockStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:73:10
[INFO] [stderr]    |
[INFO] [stderr] 73 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]   --> src/ast/mod.rs:82:10
[INFO] [stderr]    |
[INFO] [stderr] 82 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Program`
[INFO] [stderr]   --> src/ast/mod.rs:92:12
[INFO] [stderr]    |
[INFO] [stderr] 92 | pub struct Program {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:97:10
[INFO] [stderr]    |
[INFO] [stderr] 97 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string`
[INFO] [stderr]    --> src/ast/mod.rs:105:10
[INFO] [stderr]     |
[INFO] [stderr] 105 |   pub fn to_string(&self) -> String {
[INFO] [stderr]     |          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 75 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:37:3
[INFO] [stderr]    |
[INFO] [stderr] 37 |   pub const CALL: u8 = 6;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/block_statement.rs:11:10
[INFO] [stderr]    |
[INFO] [stderr] 11 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/boolean_literal.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/function_literal.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/identifier.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/if_expression.rs:14:10
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/infix_expression.rs:13:10
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/integer_literal.rs:10:10
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/prefix_expression.rs:12:10
[INFO] [stderr]    |
[INFO] [stderr] 12 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:39:10
[INFO] [stderr]    |
[INFO] [stderr] 39 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlockStatement`
[INFO] [stderr]   --> src/ast/mod.rs:69:3
[INFO] [stderr]    |
[INFO] [stderr] 69 |   BlockStatement(BlockStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:73:10
[INFO] [stderr]    |
[INFO] [stderr] 73 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:97:10
[INFO] [stderr]    |
[INFO] [stderr] 97 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 14 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `"docker" "inspect" "0915116ed0fff4a7817723b2823bd2946ee2c9ffe18dbb82136b1dc970b9f513"`
[INFO] running `"docker" "rm" "-f" "0915116ed0fff4a7817723b2823bd2946ee2c9ffe18dbb82136b1dc970b9f513"`
[INFO] [stdout] 0915116ed0fff4a7817723b2823bd2946ee2c9ffe18dbb82136b1dc970b9f513