[INFO] updating cached repository https://github.com/daogilvie/rust-monkey
[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] 33e005abc9b2cac95494b333a8d5c5caa968c36d
[INFO] checking daogilvie/rust-monkey against try#8a749131e7beb72f6edacefd2bdcbed3d67b2112 for pr-72331
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaogilvie%2Frust-monkey" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/daogilvie/rust-monkey on toolchain 8a749131e7beb72f6edacefd2bdcbed3d67b2112
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/daogilvie/rust-monkey
[INFO] finished tweaking git repo https://github.com/daogilvie/rust-monkey
[INFO] tweaked toml for git repo https://github.com/daogilvie/rust-monkey written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/daogilvie/rust-monkey already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "+8a749131e7beb72f6edacefd2bdcbed3d67b2112" "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] b92962cd674ce376e983fa1f1c70ce6b8e44371e6e00239acb09563dcc73c22e
[INFO] running `"docker" "start" "-a" "b92962cd674ce376e983fa1f1c70ce6b8e44371e6e00239acb09563dcc73c22e"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust-monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: associated function is never used: `for_str`
[INFO] [stderr]    --> src/./lex.rs:112:12
[INFO] [stderr]     |
[INFO] [stderr] 112 |     pub fn for_str(input: &str) -> Lexer {
[INFO] [stderr]     |            ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `ExpressionNode`
[INFO] [stderr]   --> src/parse.rs:10:14
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub enum ExpressionNode {
[INFO] [stderr]    |              ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `StatementNode`
[INFO] [stderr]   --> src/parse.rs:15:14
[INFO] [stderr]    |
[INFO] [stderr] 15 |     pub enum StatementNode {
[INFO] [stderr]    |              ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Program`
[INFO] [stderr]   --> src/parse.rs:28:16
[INFO] [stderr]    |
[INFO] [stderr] 28 |     pub struct Program {
[INFO] [stderr]    |                ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Parser`
[INFO] [stderr]   --> src/parse.rs:33:8
[INFO] [stderr]    |
[INFO] [stderr] 33 | struct Parser<'a> {
[INFO] [stderr]    |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `for_lexer`
[INFO] [stderr]   --> src/parse.rs:41:8
[INFO] [stderr]    |
[INFO] [stderr] 41 |     fn for_lexer(mut lexer: lex::Lexer) -> Parser {
[INFO] [stderr]    |        ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `advance_tokens`
[INFO] [stderr]   --> src/parse.rs:53:12
[INFO] [stderr]    |
[INFO] [stderr] 53 |     pub fn advance_tokens(&mut self) -> lex::Token {
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse`
[INFO] [stderr]   --> src/parse.rs:61:12
[INFO] [stderr]    |
[INFO] [stderr] 61 |     pub fn parse(&mut self) -> Result<ast::Program, String> {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_statement`
[INFO] [stderr]   --> src/parse.rs:85:8
[INFO] [stderr]    |
[INFO] [stderr] 85 |     fn parse_statement(&mut self) -> Result<ast::StatementNode, String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_next_token_of_type`
[INFO] [stderr]   --> src/parse.rs:96:8
[INFO] [stderr]    |
[INFO] [stderr] 96 |     fn is_next_token_of_type(&self, expected_type: lex::TokenType) -> bool {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `is_current_token_of_type`
[INFO] [stderr]    --> src/parse.rs:103:8
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn is_current_token_of_type(&self, expected_type: lex::TokenType) -> bool {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_let_statement`
[INFO] [stderr]    --> src/parse.rs:107:8
[INFO] [stderr]     |
[INFO] [stderr] 107 |     fn parse_let_statement(&mut self) -> Result<ast::StatementNode, String> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `parse_return_statement`
[INFO] [stderr]    --> src/parse.rs:141:8
[INFO] [stderr]     |
[INFO] [stderr] 141 |     fn parse_return_statement(&mut self) -> Result<ast::StatementNode, String> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 13 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.14s
[INFO] running `"docker" "inspect" "b92962cd674ce376e983fa1f1c70ce6b8e44371e6e00239acb09563dcc73c22e"`
[INFO] running `"docker" "rm" "-f" "b92962cd674ce376e983fa1f1c70ce6b8e44371e6e00239acb09563dcc73c22e"`
[INFO] [stdout] b92962cd674ce376e983fa1f1c70ce6b8e44371e6e00239acb09563dcc73c22e