[INFO] cloning repository https://github.com/wvanlit/rust-monkey
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wvanlit/rust-monkey" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwvanlit%2Frust-monkey", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwvanlit%2Frust-monkey'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e0d0d3c23c9d97fb45da7396cb0e96646da17965
[INFO] building wvanlit/rust-monkey against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwvanlit%2Frust-monkey" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wvanlit/rust-monkey on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wvanlit/rust-monkey
[INFO] finished tweaking git repo https://github.com/wvanlit/rust-monkey
[INFO] tweaked toml for git repo https://github.com/wvanlit/rust-monkey written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/wvanlit/rust-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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2a1c459155973770c235538f0531e4614e59b029828356c305878aada1c508ea
[INFO] running `Command { std: "docker" "start" "-a" "2a1c459155973770c235538f0531e4614e59b029828356c305878aada1c508ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2a1c459155973770c235538f0531e4614e59b029828356c305878aada1c508ea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a1c459155973770c235538f0531e4614e59b029828356c305878aada1c508ea", kill_on_drop: false }`
[INFO] [stdout] 2a1c459155973770c235538f0531e4614e59b029828356c305878aada1c508ea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7330e77fee96f158426213b86fbc8b8b836aeb1ef1e0223f6dbf9ad326b7a71e
[INFO] running `Command { std: "docker" "start" "-a" "7330e77fee96f158426213b86fbc8b8b836aeb1ef1e0223f6dbf9ad326b7a71e", kill_on_drop: false }`
[INFO] [stderr]    Compiling monkey_interpreter v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `program_to_string` is never used
[INFO] [stdout]  --> src/parser/ast.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | pub fn program_to_string(program: &Program) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `None` is never constructed
[INFO] [stdout]   --> src/parser/ast.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub enum Statement {
[INFO] [stdout]    |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 26 |     None,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Statement` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `Command { std: "docker" "inspect" "7330e77fee96f158426213b86fbc8b8b836aeb1ef1e0223f6dbf9ad326b7a71e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7330e77fee96f158426213b86fbc8b8b836aeb1ef1e0223f6dbf9ad326b7a71e", kill_on_drop: false }`
[INFO] [stdout] 7330e77fee96f158426213b86fbc8b8b836aeb1ef1e0223f6dbf9ad326b7a71e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f0fce374b004accb5836e1a39db6d41856c6517ef2c80c1e4cdd9db713675e2
[INFO] running `Command { std: "docker" "start" "-a" "4f0fce374b004accb5836e1a39db6d41856c6517ef2c80c1e4cdd9db713675e2", kill_on_drop: false }`
[INFO] [stderr]    Compiling monkey_interpreter v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant `None` is never constructed
[INFO] [stdout]   --> src/parser/ast.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub enum Statement {
[INFO] [stdout]    |          --------- variant in this enum
[INFO] [stdout] ...
[INFO] [stdout] 26 |     None,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Statement` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `Command { std: "docker" "inspect" "4f0fce374b004accb5836e1a39db6d41856c6517ef2c80c1e4cdd9db713675e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f0fce374b004accb5836e1a39db6d41856c6517ef2c80c1e4cdd9db713675e2", kill_on_drop: false }`
[INFO] [stdout] 4f0fce374b004accb5836e1a39db6d41856c6517ef2c80c1e4cdd9db713675e2