[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]    b1329ce..58cdadc  master     -> master
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 58cdadc785ab00749ef3ad7f3da80aa17025fa90
[INFO] checking jeppester/rust-interpreter against master#3dbade652ed8ebac70f903e01f51cd92c4e4302c for pr-69880
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeppester%2Frust-interpreter" "/workspace/builds/worker-2/source"`
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[INFO] validating manifest of git repo https://github.com/jeppester/rust-interpreter on toolchain 3dbade652ed8ebac70f903e01f51cd92c4e4302c
[INFO] running `"/workspace/cargo-home/bin/cargo" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "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" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "+3dbade652ed8ebac70f903e01f51cd92c4e4302c" "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] 3ce45c3be1bb069291d0322a8c5652127c84d9ed4ddaf215fe382dc946fdf37d
[INFO] running `"docker" "start" "-a" "3ce45c3be1bb069291d0322a8c5652127c84d9ed4ddaf215fe382dc946fdf37d"`
[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:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | 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:26:3
[INFO] [stderr]    |
[INFO] [stderr] 26 |   pub const LOWEST: u8 = 0;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `EQUALS`
[INFO] [stderr]   --> src/parser/mod.rs:27:3
[INFO] [stderr]    |
[INFO] [stderr] 27 |   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:28:3
[INFO] [stderr]    |
[INFO] [stderr] 28 |   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:29:3
[INFO] [stderr]    |
[INFO] [stderr] 29 |   pub const SUM: u8 = 3;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PRODUCT`
[INFO] [stderr]   --> src/parser/mod.rs:30:3
[INFO] [stderr]    |
[INFO] [stderr] 30 |   pub const PRODUCT: u8 = 4;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `PREFIX`
[INFO] [stderr]   --> src/parser/mod.rs:31:3
[INFO] [stderr]    |
[INFO] [stderr] 31 |   pub const PREFIX: u8 = 5;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:32:3
[INFO] [stderr]    |
[INFO] [stderr] 32 |   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:35:8
[INFO] [stderr]    |
[INFO] [stderr] 35 | 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:49:12
[INFO] [stderr]    |
[INFO] [stderr] 49 | pub struct Parser {
[INFO] [stderr]    |            ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_boolean`
[INFO] [stderr]   --> src/parser/mod.rs:58:8
[INFO] [stderr]    |
[INFO] [stderr] 58 | pub fn parse_boolean(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_identifier`
[INFO] [stderr]   --> src/parser/mod.rs:65:8
[INFO] [stderr]    |
[INFO] [stderr] 65 | 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:75:8
[INFO] [stderr]    |
[INFO] [stderr] 75 | pub fn parse_integer_literal(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_prefix_expression`
[INFO] [stderr]   --> src/parser/mod.rs:91:8
[INFO] [stderr]    |
[INFO] [stderr] 91 | pub fn parse_prefix_expression(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_infix_expression`
[INFO] [stderr]    --> src/parser/mod.rs:112:8
[INFO] [stderr]     |
[INFO] [stderr] 112 | pub fn parse_infix_expression(parser: &mut Parser, left: Expression) -> Option<Expression> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_grouped_expression`
[INFO] [stderr]    --> src/parser/mod.rs:135:8
[INFO] [stderr]     |
[INFO] [stderr] 135 | pub fn parse_grouped_expression(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `parse_if_expression`
[INFO] [stderr]    --> src/parser/mod.rs:147:8
[INFO] [stderr]     |
[INFO] [stderr] 147 | pub fn parse_if_expression(parser: &mut Parser) -> Option<Expression> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]    --> src/parser/mod.rs:190:3
[INFO] [stderr]     |
[INFO] [stderr] 190 |   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:226:3
[INFO] [stderr]     |
[INFO] [stderr] 226 |   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:232:3
[INFO] [stderr]     |
[INFO] [stderr] 232 |   pub fn parse_program(&mut self) -> Program {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_block_statement`
[INFO] [stderr]    --> src/parser/mod.rs:259:3
[INFO] [stderr]     |
[INFO] [stderr] 259 |   pub fn parse_block_statement(&mut self) -> BlockStatement {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_statement`
[INFO] [stderr]    --> src/parser/mod.rs:281:3
[INFO] [stderr]     |
[INFO] [stderr] 281 |   pub fn parse_statement(&mut self) -> Option<Statement> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_let_statement`
[INFO] [stderr]    --> src/parser/mod.rs:289:3
[INFO] [stderr]     |
[INFO] [stderr] 289 |   pub fn parse_let_statement(&mut self) -> Option<Statement> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_return_statement`
[INFO] [stderr]    --> src/parser/mod.rs:317:3
[INFO] [stderr]     |
[INFO] [stderr] 317 |   pub fn parse_return_statement(&mut self) -> Option<Statement> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_expression_statement`
[INFO] [stderr]    --> src/parser/mod.rs:340:3
[INFO] [stderr]     |
[INFO] [stderr] 340 |   pub fn parse_expression_statement(&mut self) -> Option<Statement> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `parse_expression`
[INFO] [stderr]    --> src/parser/mod.rs:354:3
[INFO] [stderr]     |
[INFO] [stderr] 354 |   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:391:3
[INFO] [stderr]     |
[INFO] [stderr] 391 |   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:395:3
[INFO] [stderr]     |
[INFO] [stderr] 395 |   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:399:3
[INFO] [stderr]     |
[INFO] [stderr] 399 |   pub fn expect_peek(&mut self, token_type: TokenType) -> bool {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `current_precedence`
[INFO] [stderr]    --> src/parser/mod.rs:409:3
[INFO] [stderr]     |
[INFO] [stderr] 409 |   pub fn current_precedence(&mut self) -> Precedence {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_precedence`
[INFO] [stderr]    --> src/parser/mod.rs:413:3
[INFO] [stderr]     |
[INFO] [stderr] 413 |   pub fn peek_precedence(&mut self) -> Precedence {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `prefix_parser_error`
[INFO] [stderr]    --> src/parser/mod.rs:417:3
[INFO] [stderr]     |
[INFO] [stderr] 417 |   pub fn prefix_parser_error(&mut self, token_type: TokenType) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `no_right_error`
[INFO] [stderr]    --> src/parser/mod.rs:422:3
[INFO] [stderr]     |
[INFO] [stderr] 422 |   pub fn no_right_error(&mut self, token_type: TokenType) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `peek_error`
[INFO] [stderr]    --> src/parser/mod.rs:427:3
[INFO] [stderr]     |
[INFO] [stderr] 427 |   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:435:3
[INFO] [stderr]     |
[INFO] [stderr] 435 | /   pub fn register_prefix(
[INFO] [stderr] 436 | |     &mut self,
[INFO] [stderr] 437 | |     token_type: TokenType,
[INFO] [stderr] 438 | |     parser_function: fn(&mut Parser) -> Option<Expression>,
[INFO] [stderr] ...   |
[INFO] [stderr] 442 | |       .insert(token_type, parser_function);
[INFO] [stderr] 443 | |   }
[INFO] [stderr]     | |___^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:445:3
[INFO] [stderr]     |
[INFO] [stderr] 445 | /   pub fn register_infix(
[INFO] [stderr] 446 | |     &mut self,
[INFO] [stderr] 447 | |     token_type: TokenType,
[INFO] [stderr] 448 | |     parser_function: fn(&mut Parser, Expression) -> Option<Expression>,
[INFO] [stderr] ...   |
[INFO] [stderr] 452 | |       .insert(token_type, parser_function);
[INFO] [stderr] 453 | |   }
[INFO] [stderr]     | |___^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/block_statement.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/block_statement.rs:15:3
[INFO] [stderr]    |
[INFO] [stderr] 15 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/boolean_literal.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/boolean_literal.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/identifier.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/identifier.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/if_expression.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/if_expression.rs:18:3
[INFO] [stderr]    |
[INFO] [stderr] 18 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/infix_expression.rs:13:3
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/infix_expression.rs:17:3
[INFO] [stderr]    |
[INFO] [stderr] 17 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/integer_literal.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/integer_literal.rs:14:3
[INFO] [stderr]    |
[INFO] [stderr] 14 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/let_statement.rs:13:3
[INFO] [stderr]    |
[INFO] [stderr] 13 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/let_statement.rs:17:3
[INFO] [stderr]    |
[INFO] [stderr] 17 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/prefix_expression.rs:12:3
[INFO] [stderr]    |
[INFO] [stderr] 12 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/prefix_expression.rs:16:3
[INFO] [stderr]    |
[INFO] [stderr] 16 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/return_statement.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_string`
[INFO] [stderr]   --> src/ast/return_statement.rs:15:3
[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:27:3
[INFO] [stderr]    |
[INFO] [stderr] 27 |   BooleanLiteral(BooleanLiteral),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Identifier`
[INFO] [stderr]   --> src/ast/mod.rs:28:3
[INFO] [stderr]    |
[INFO] [stderr] 28 |   Identifier(Identifier),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IntegerLiteral`
[INFO] [stderr]   --> src/ast/mod.rs:29:3
[INFO] [stderr]    |
[INFO] [stderr] 29 |   IntegerLiteral(IntegerLiteral),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `PrefixExpression`
[INFO] [stderr]   --> src/ast/mod.rs:30:3
[INFO] [stderr]    |
[INFO] [stderr] 30 |   PrefixExpression(PrefixExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `InfixExpression`
[INFO] [stderr]   --> src/ast/mod.rs:31:3
[INFO] [stderr]    |
[INFO] [stderr] 31 |   InfixExpression(InfixExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `IfExpression`
[INFO] [stderr]   --> src/ast/mod.rs:32:3
[INFO] [stderr]    |
[INFO] [stderr] 32 |   IfExpression(IfExpression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:36:3
[INFO] [stderr]    |
[INFO] [stderr] 36 |   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:47:3
[INFO] [stderr]    |
[INFO] [stderr] 47 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `LetStatement`
[INFO] [stderr]   --> src/ast/mod.rs:61:3
[INFO] [stderr]    |
[INFO] [stderr] 61 |   LetStatement(LetStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ReturnStatement`
[INFO] [stderr]   --> src/ast/mod.rs:62:3
[INFO] [stderr]    |
[INFO] [stderr] 62 |   ReturnStatement(ReturnStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:63:3
[INFO] [stderr]    |
[INFO] [stderr] 63 |   Expression(Expression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlockStatement`
[INFO] [stderr]   --> src/ast/mod.rs:64:3
[INFO] [stderr]    |
[INFO] [stderr] 64 |   BlockStatement(BlockStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:68:3
[INFO] [stderr]    |
[INFO] [stderr] 68 |   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:77:3
[INFO] [stderr]    |
[INFO] [stderr] 77 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Program`
[INFO] [stderr]   --> src/ast/mod.rs:87:12
[INFO] [stderr]    |
[INFO] [stderr] 87 | pub struct Program {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:92:3
[INFO] [stderr]    |
[INFO] [stderr] 92 |   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:100:3
[INFO] [stderr]     |
[INFO] [stderr] 100 |   pub fn to_string(&self) -> String {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `CALL`
[INFO] [stderr]   --> src/parser/mod.rs:32:3
[INFO] [stderr]    |
[INFO] [stderr] 32 |   pub const CALL: u8 = 6;
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `BlockStatement`
[INFO] [stderr]   --> src/ast/mod.rs:64:3
[INFO] [stderr]    |
[INFO] [stderr] 64 |   BlockStatement(BlockStatement),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:92:3
[INFO] [stderr]    |
[INFO] [stderr] 92 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.61s
[INFO] running `"docker" "inspect" "3ce45c3be1bb069291d0322a8c5652127c84d9ed4ddaf215fe382dc946fdf37d"`
[INFO] running `"docker" "rm" "-f" "3ce45c3be1bb069291d0322a8c5652127c84d9ed4ddaf215fe382dc946fdf37d"`
[INFO] [stdout] 3ce45c3be1bb069291d0322a8c5652127c84d9ed4ddaf215fe382dc946fdf37d