[INFO] cloning repository https://github.com/Karribalu/rs-monkey
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Karribalu/rs-monkey" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKarribalu%2Frs-monkey", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKarribalu%2Frs-monkey'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f6155ef1033f729527d1c4c2774a15d5c2d4bbc
[INFO] testing Karribalu/rs-monkey against beta-2026-04-21 for beta-1.96-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKarribalu%2Frs-monkey" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Karribalu/rs-monkey
[INFO] finished tweaking git repo https://github.com/Karribalu/rs-monkey
[INFO] tweaked toml for git repo https://github.com/Karribalu/rs-monkey written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Karribalu/rs-monkey on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Karribalu/rs-monkey already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thiserror-impl v2.0.11
[INFO] [stderr]   Downloaded thiserror v2.0.11
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 03ebe13a29fb013d8fac908e890aa20bf7ad09f5e1c67d034b390ed93f9cec4b
[INFO] running `Command { std: "docker" "start" "-a" "03ebe13a29fb013d8fac908e890aa20bf7ad09f5e1c67d034b390ed93f9cec4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03ebe13a29fb013d8fac908e890aa20bf7ad09f5e1c67d034b390ed93f9cec4b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03ebe13a29fb013d8fac908e890aa20bf7ad09f5e1c67d034b390ed93f9cec4b", kill_on_drop: false }`
[INFO] [stdout] 03ebe13a29fb013d8fac908e890aa20bf7ad09f5e1c67d034b390ed93f9cec4b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fdab363a86c8f1ba4234ca6f78f01fd7d2932a2a5746061acc9a55ff9d27a8a3
[INFO] running `Command { std: "docker" "start" "-a" "fdab363a86c8f1ba4234ca6f78f01fd7d2932a2a5746061acc9a55ff9d27a8a3", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling unicode-ident v1.0.16
[INFO] [stderr]    Compiling thiserror v2.0.11
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling syn v2.0.98
[INFO] [stderr]    Compiling thiserror-impl v2.0.11
[INFO] [stderr]    Compiling rs-monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `let_chains` has been stable since `1.88.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ast::Expression::Identifier`
[INFO] [stdout]    --> src/ast.rs:225:9
[INFO] [stdout]     |
[INFO] [stdout] 225 |     use crate::ast::Expression::Identifier;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BlockStatement`, `ExpressionStatement`, `FunctionLiteral`, `IdentifierExpression`, and `Statement`
[INFO] [stdout]    --> src/ast.rs:227:9
[INFO] [stdout]     |
[INFO] [stdout] 227 |         BlockStatement, ExpressionStatement, FunctionLiteral, IdentifierExpression, Statement,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::lexer::Lexer`
[INFO] [stdout]    --> src/lexer.rs:122:9
[INFO] [stdout]     |
[INFO] [stdout] 122 |     use crate::lexer::Lexer;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::token::Token`
[INFO] [stdout]    --> src/lexer.rs:123:9
[INFO] [stdout]     |
[INFO] [stdout] 123 |     use crate::token::Token;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::ast::Expression::Identifier`
[INFO] [stdout]    --> src/parser.rs:343:9
[INFO] [stdout]     |
[INFO] [stdout] 343 |     use crate::ast::Expression::Identifier;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BlockStatement`, `CallExpression`, `ExpressionStatement`, `Expression`, `FunctionLiteral`, `IdentifierExpression`, `IfExpression`, `InfixExpression`, `LetStatement`, `PrefixExpression`, `ReturnStatement`, and `Statement`
[INFO] [stdout]    --> src/parser.rs:345:9
[INFO] [stdout]     |
[INFO] [stdout] 345 |         BlockStatement, CallExpression, Expression, ExpressionStatement, FunctionLiteral,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^  ^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 346 |         IdentifierExpression, IfExpression, InfixExpression, LetStatement, PrefixExpression,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^  ^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^
[INFO] [stdout] 347 |         Program, ReturnStatement, Statement,
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ParseError`
[INFO] [stdout]    --> src/parser.rs:350:25
[INFO] [stdout]     |
[INFO] [stdout] 350 |     use crate::parser::{ParseError, ParseResult, Parser};
[INFO] [stdout]     |                         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::token::Token`
[INFO] [stdout]    --> src/parser.rs:351:9
[INFO] [stdout]     |
[INFO] [stdout] 351 |     use crate::token::Token;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Add`
[INFO] [stdout]    --> src/parser.rs:352:9
[INFO] [stdout]     |
[INFO] [stdout] 352 |     use std::ops::Add;
[INFO] [stdout]     |         ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `let_chains` has been stable since 1.88.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(let_chains)]
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/evaluator.rs:30:17
[INFO] [stdout]    |
[INFO] [stdout] 26 | /         match statement {
[INFO] [stdout] 27 | |             Statement::Let(let_statement) => {
[INFO] [stdout] 28 | |                 let res = eval_let_statement(&let_statement)?;
[INFO] [stdout] 29 | |                 // env.set()
[INFO] [stdout] 30 | |                 Object::Null
[INFO] [stdout]    | |                 ^^^^^^^^^^^^ expected `()`, found `Object`
[INFO] [stdout] ...  |
[INFO] [stdout] 42 | |         }
[INFO] [stdout]    | |_________- expected this to be `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/evaluator.rs:40:17
[INFO] [stdout]    |
[INFO] [stdout] 26 | /         match statement {
[INFO] [stdout] 27 | |             Statement::Let(let_statement) => {
[INFO] [stdout] 28 | |                 let res = eval_let_statement(&let_statement)?;
[INFO] [stdout] ...  |
[INFO] [stdout] 40 | |                 Object::Null
[INFO] [stdout]    | |                 ^^^^^^^^^^^^ expected `()`, found `Object`
[INFO] [stdout] 41 | |             }
[INFO] [stdout] 42 | |         }
[INFO] [stdout]    | |_________- expected this to be `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `statement`
[INFO] [stdout]   --> src/evaluator.rs:50:23
[INFO] [stdout]    |
[INFO] [stdout] 50 | fn eval_let_statement(statement: &LetStatement) -> EvalResult<Object> {
[INFO] [stdout]    |                       ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_statement`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rs-monkey` (bin "rs-monkey") due to 3 previous errors; 11 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "fdab363a86c8f1ba4234ca6f78f01fd7d2932a2a5746061acc9a55ff9d27a8a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fdab363a86c8f1ba4234ca6f78f01fd7d2932a2a5746061acc9a55ff9d27a8a3", kill_on_drop: false }`
[INFO] [stdout] fdab363a86c8f1ba4234ca6f78f01fd7d2932a2a5746061acc9a55ff9d27a8a3