[INFO] cloning repository https://github.com/sbarrios93/interpreter-book-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sbarrios93/interpreter-book-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsbarrios93%2Finterpreter-book-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsbarrios93%2Finterpreter-book-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d0681b32de1be79514ab7f8d7ab6eb7db755c2b1
[INFO] building sbarrios93/interpreter-book-rust 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%2Fsbarrios93%2Finterpreter-book-rust" "/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/sbarrios93/interpreter-book-rust 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/sbarrios93/interpreter-book-rust
[INFO] finished tweaking git repo https://github.com/sbarrios93/interpreter-book-rust
[INFO] tweaked toml for git repo https://github.com/sbarrios93/interpreter-book-rust written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sbarrios93/interpreter-book-rust 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] [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 unicode-ident v1.0.10
[INFO] [stderr]   Downloaded syn v2.0.23
[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] 5b48737f027535345c4ad8154acbbe4124417beadaec27aef2c6088383ce3c41
[INFO] running `Command { std: "docker" "start" "-a" "5b48737f027535345c4ad8154acbbe4124417beadaec27aef2c6088383ce3c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5b48737f027535345c4ad8154acbbe4124417beadaec27aef2c6088383ce3c41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b48737f027535345c4ad8154acbbe4124417beadaec27aef2c6088383ce3c41", kill_on_drop: false }`
[INFO] [stdout] 5b48737f027535345c4ad8154acbbe4124417beadaec27aef2c6088383ce3c41
[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] 1bfcb0c223012f2ec2260fbe0cbf99c0471b54f3f7277e6a4704dc3205ab9187
[INFO] running `Command { std: "docker" "start" "-a" "1bfcb0c223012f2ec2260fbe0cbf99c0471b54f3f7277e6a4704dc3205ab9187", kill_on_drop: false }`
[INFO] [stderr]    Compiling whoami v1.4.1
[INFO] [stderr]    Compiling interpreter-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `precedence`
[INFO] [stdout]    --> src/parser/mod.rs:151:32
[INFO] [stdout]     |
[INFO] [stdout] 151 |     fn parse_expression(&self, precedence: OperatorPrecedence) -> Result<Expression> {
[INFO] [stdout]     |                                ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_precedence`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `Command { std: "docker" "inspect" "1bfcb0c223012f2ec2260fbe0cbf99c0471b54f3f7277e6a4704dc3205ab9187", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bfcb0c223012f2ec2260fbe0cbf99c0471b54f3f7277e6a4704dc3205ab9187", kill_on_drop: false }`
[INFO] [stdout] 1bfcb0c223012f2ec2260fbe0cbf99c0471b54f3f7277e6a4704dc3205ab9187
[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] 6a4e42b7956660e53ef655b3c25fefb9cd9f2defcc32fde9477c3a469bfd60cf
[INFO] running `Command { std: "docker" "start" "-a" "6a4e42b7956660e53ef655b3c25fefb9cd9f2defcc32fde9477c3a469bfd60cf", kill_on_drop: false }`
[INFO] [stderr]    Compiling interpreter-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `precedence`
[INFO] [stdout]    --> src/parser/mod.rs:151:32
[INFO] [stdout]     |
[INFO] [stdout] 151 |     fn parse_expression(&self, precedence: OperatorPrecedence) -> Result<Expression> {
[INFO] [stdout]     |                                ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_precedence`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "6a4e42b7956660e53ef655b3c25fefb9cd9f2defcc32fde9477c3a469bfd60cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a4e42b7956660e53ef655b3c25fefb9cd9f2defcc32fde9477c3a469bfd60cf", kill_on_drop: false }`
[INFO] [stdout] 6a4e42b7956660e53ef655b3c25fefb9cd9f2defcc32fde9477c3a469bfd60cf