[INFO] updating cached repository https://github.com/jeppester/rust-interpreter
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/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] b37950ac2ab522f1b78957e2c6bba6e3362c665b
[INFO] checking jeppester/rust-interpreter against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeppester%2Frust-interpreter" "work/builds/worker-5/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jeppester/rust-interpreter on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "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 work/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/jeppester/rust-interpreter already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-5/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 284745e74f225000646283f2b254f4b80b9eefaa312ececc06f0b23b3830365b
[INFO] running `"docker" "start" "-a" "284745e74f225000646283f2b254f4b80b9eefaa312ececc06f0b23b3830365b"`
[INFO] [stderr]     Checking monkey-interpreter v0.1.0 (/opt/rustwide/workdir)
[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: `register_prefix`
[INFO] [stderr]    --> src/parser/mod.rs:141:3
[INFO] [stderr]     |
[INFO] [stderr] 141 |   pub fn register_prefix(&mut self, token_type: TokenType, parser_function: fn(&mut Parser) -> Expression) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:145:3
[INFO] [stderr]     |
[INFO] [stderr] 145 |   pub fn register_infix(&mut self, token_type: TokenType, parser_function: fn(&mut Parser, Expression) -> Expression) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Identifier`
[INFO] [stderr]   --> src/ast/mod.rs:16:3
[INFO] [stderr]    |
[INFO] [stderr] 16 |   Identifier(Identifier),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ExpressionStatement`
[INFO] [stderr]   --> src/ast/mod.rs:36:3
[INFO] [stderr]    |
[INFO] [stderr] 36 |   ExpressionStatement(ExpressionStatement),
[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] 
[INFO] [stderr] warning: variant is never constructed: `Expression`
[INFO] [stderr]   --> src/ast/mod.rs:86:3
[INFO] [stderr]    |
[INFO] [stderr] 86 |   Expression(Expression),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]    --> src/ast/mod.rs:111:3
[INFO] [stderr]     |
[INFO] [stderr] 111 |   pub fn token_literal(&self) -> Literal {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Parser`
[INFO] [stderr]   --> src/parser/mod.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub struct Parser {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/parser/mod.rs:24:3
[INFO] [stderr]    |
[INFO] [stderr] 24 |   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:38:3
[INFO] [stderr]    |
[INFO] [stderr] 38 |   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:44:3
[INFO] [stderr]    |
[INFO] [stderr] 44 |   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:72:3
[INFO] [stderr]    |
[INFO] [stderr] 72 |   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:80:3
[INFO] [stderr]    |
[INFO] [stderr] 80 |   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:105:3
[INFO] [stderr]     |
[INFO] [stderr] 105 |   pub fn parse_return_statement(&mut self) -> Option<Node> {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `current_token_is`
[INFO] [stderr]    --> src/parser/mod.rs:117:3
[INFO] [stderr]     |
[INFO] [stderr] 117 |   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:121:3
[INFO] [stderr]     |
[INFO] [stderr] 121 |   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:125:3
[INFO] [stderr]     |
[INFO] [stderr] 125 |   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:136:3
[INFO] [stderr]     |
[INFO] [stderr] 136 |   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:141:3
[INFO] [stderr]     |
[INFO] [stderr] 141 |   pub fn register_prefix(&mut self, token_type: TokenType, parser_function: fn(&mut Parser) -> Expression) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `register_infix`
[INFO] [stderr]    --> src/parser/mod.rs:145:3
[INFO] [stderr]     |
[INFO] [stderr] 145 |   pub fn register_infix(&mut self, token_type: TokenType, parser_function: fn(&mut Parser, Expression) -> Expression) {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `LetStatement`
[INFO] [stderr]  --> src/ast/let_statement.rs:5:1
[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:4:1
[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:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub struct Identifier {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ExpressionStatement`
[INFO] [stderr]  --> src/ast/expression_statement.rs:4:1
[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:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | pub enum Expression {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:20:3
[INFO] [stderr]    |
[INFO] [stderr] 20 |   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:26:3
[INFO] [stderr]    |
[INFO] [stderr] 26 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Statement`
[INFO] [stderr]   --> src/ast/mod.rs:33:1
[INFO] [stderr]    |
[INFO] [stderr] 33 | pub enum Statement {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:40:3
[INFO] [stderr]    |
[INFO] [stderr] 40 |   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:48:3
[INFO] [stderr]    |
[INFO] [stderr] 48 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Node`
[INFO] [stderr]   --> src/ast/mod.rs:85:1
[INFO] [stderr]    |
[INFO] [stderr] 85 | pub enum Node {
[INFO] [stderr]    | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]   --> src/ast/mod.rs:91:3
[INFO] [stderr]    |
[INFO] [stderr] 91 |   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:98:3
[INFO] [stderr]    |
[INFO] [stderr] 98 |   pub fn to_string(&self) -> String {
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Program`
[INFO] [stderr]    --> src/ast/mod.rs:106:1
[INFO] [stderr]     |
[INFO] [stderr] 106 | pub struct Program {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `token_literal`
[INFO] [stderr]    --> src/ast/mod.rs:111:3
[INFO] [stderr]     |
[INFO] [stderr] 111 |   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:120:3
[INFO] [stderr]     |
[INFO] [stderr] 120 |   pub fn to_string(&self) -> String {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.25s
[INFO] running `"docker" "inspect" "284745e74f225000646283f2b254f4b80b9eefaa312ececc06f0b23b3830365b"`
[INFO] running `"docker" "rm" "-f" "284745e74f225000646283f2b254f4b80b9eefaa312ececc06f0b23b3830365b"`
[INFO] [stdout] 284745e74f225000646283f2b254f4b80b9eefaa312ececc06f0b23b3830365b