[INFO] cloning repository https://github.com/lupuszr/rust-lambda-calculus-interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lupuszr/rust-lambda-calculus-interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flupuszr%2Frust-lambda-calculus-interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flupuszr%2Frust-lambda-calculus-interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0724c85f11fce2189826745b071fd3b57d3daa21
[INFO] checking lupuszr/rust-lambda-calculus-interpreter against master#c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flupuszr%2Frust-lambda-calculus-interpreter" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lupuszr/rust-lambda-calculus-interpreter on toolchain c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lupuszr/rust-lambda-calculus-interpreter
[INFO] finished tweaking git repo https://github.com/lupuszr/rust-lambda-calculus-interpreter
[INFO] tweaked toml for git repo https://github.com/lupuszr/rust-lambda-calculus-interpreter written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/lupuszr/rust-lambda-calculus-interpreter 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" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cf214c8bcd3e4212109532c85fe0dc74401a50547a91100adb40e401fefc5c86
[INFO] running `Command { std: "docker" "start" "-a" "cf214c8bcd3e4212109532c85fe0dc74401a50547a91100adb40e401fefc5c86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf214c8bcd3e4212109532c85fe0dc74401a50547a91100adb40e401fefc5c86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf214c8bcd3e4212109532c85fe0dc74401a50547a91100adb40e401fefc5c86", kill_on_drop: false }`
[INFO] [stdout] cf214c8bcd3e4212109532c85fe0dc74401a50547a91100adb40e401fefc5c86
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+c43786c9b7b8d8dcc3f9c604e0e3074c16ed69d3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8eb5a2f9e0ef063154ae8bd152560c3f26293c4157ce3bb39c15cda59ff39900
[INFO] running `Command { std: "docker" "start" "-a" "8eb5a2f9e0ef063154ae8bd152560c3f26293c4157ce3bb39c15cda59ff39900", kill_on_drop: false }`
[INFO] [stderr]     Checking lambda_interpreter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `cell::RefCell`
[INFO] [stdout]  --> src/main.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{rc::Rc, collections::HashMap, cell::RefCell, ops::Deref};
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/main.rs:12:34
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let x = Rc::new(Box::new((a)));
[INFO] [stdout]    |                                  ^ ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 12 -         let x = Rc::new(Box::new((a)));
[INFO] [stdout] 12 +         let x = Rc::new(Box::new(a));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Abstraction`, `Application`, and `Variable`
[INFO] [stdout]    --> src/main.rs:150:22
[INFO] [stdout]     |
[INFO] [stdout] 150 |     use Expression::{Abstraction, Application, Variable};
[INFO] [stdout]     |                      ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_abstraction` is never used
[INFO] [stdout]   --> src/main.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Expression {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 36 |     pub fn new_abstraction(param: String, body: Expression) -> Expression {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `cell::RefCell`
[INFO] [stdout]  --> src/main.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{rc::Rc, collections::HashMap, cell::RefCell, ops::Deref};
[INFO] [stdout]   |                                         ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around function argument
[INFO] [stdout]   --> src/main.rs:12:34
[INFO] [stdout]    |
[INFO] [stdout] 12 |         let x = Rc::new(Box::new((a)));
[INFO] [stdout]    |                                  ^ ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 12 -         let x = Rc::new(Box::new((a)));
[INFO] [stdout] 12 +         let x = Rc::new(Box::new(a));
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Abstraction`, `Application`, and `Variable`
[INFO] [stdout]    --> src/main.rs:150:22
[INFO] [stdout]     |
[INFO] [stdout] 150 |     use Expression::{Abstraction, Application, Variable};
[INFO] [stdout]     |                      ^^^^^^^^^^^  ^^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_abstraction` is never used
[INFO] [stdout]   --> src/main.rs:36:12
[INFO] [stdout]    |
[INFO] [stdout] 35 | impl Expression {
[INFO] [stdout]    | --------------- associated function in this implementation
[INFO] [stdout] 36 |     pub fn new_abstraction(param: String, body: Expression) -> Expression {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "8eb5a2f9e0ef063154ae8bd152560c3f26293c4157ce3bb39c15cda59ff39900", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8eb5a2f9e0ef063154ae8bd152560c3f26293c4157ce3bb39c15cda59ff39900", kill_on_drop: false }`
[INFO] [stdout] 8eb5a2f9e0ef063154ae8bd152560c3f26293c4157ce3bb39c15cda59ff39900