[INFO] cloning repository https://github.com/knissley/basic-rust-examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/knissley/basic-rust-examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fknissley%2Fbasic-rust-examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fknissley%2Fbasic-rust-examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eb3912e2b99e57591a6f3b81dd3ad34d1c70fefb
[INFO] building knissley/basic-rust-examples 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%2Fknissley%2Fbasic-rust-examples" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/knissley/basic-rust-examples 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/knissley/basic-rust-examples
[INFO] finished tweaking git repo https://github.com/knissley/basic-rust-examples
[INFO] tweaked toml for git repo https://github.com/knissley/basic-rust-examples written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/knissley/basic-rust-examples 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] e5c28442d72d3847488fd022da9d6552ff7dee1263fd2da4d07c7bfe0a404242
[INFO] running `Command { std: "docker" "start" "-a" "e5c28442d72d3847488fd022da9d6552ff7dee1263fd2da4d07c7bfe0a404242", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e5c28442d72d3847488fd022da9d6552ff7dee1263fd2da4d07c7bfe0a404242", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e5c28442d72d3847488fd022da9d6552ff7dee1263fd2da4d07c7bfe0a404242", kill_on_drop: false }`
[INFO] [stdout] e5c28442d72d3847488fd022da9d6552ff7dee1263fd2da4d07c7bfe0a404242
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] e45c25afe93f0937f26a0f82a1d11c5e1f2936adaa4cc66ace66a0aca4493c13
[INFO] running `Command { std: "docker" "start" "-a" "e45c25afe93f0937f26a0f82a1d11c5e1f2936adaa4cc66ace66a0aca4493c13", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling getrandom v0.2.9
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling rust_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/toy_problems.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DIFFICULTIES` is never used
[INFO] [stdout]  --> src/toy_problems.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const DIFFICULTIES: [&str; 3] = ["EASY", "MEDIUM", "HARD"];
[INFO] [stdout]   |       ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CATEGORIES` is never used
[INFO] [stdout]  --> src/toy_problems.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const CATEGORIES: [&str; 1] = ["Strings"];
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `difficulty` and `category` are never read
[INFO] [stdout]   --> src/toy_problems.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct ToyProblem<'a> {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 10 |     name: &'a str,
[INFO] [stdout] 11 |     difficulty: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 12 |     category: &'a str,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.54s
[INFO] running `Command { std: "docker" "inspect" "e45c25afe93f0937f26a0f82a1d11c5e1f2936adaa4cc66ace66a0aca4493c13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e45c25afe93f0937f26a0f82a1d11c5e1f2936adaa4cc66ace66a0aca4493c13", kill_on_drop: false }`
[INFO] [stdout] e45c25afe93f0937f26a0f82a1d11c5e1f2936adaa4cc66ace66a0aca4493c13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 953cd93effebc7fe616fe1428652d35c629b6cf58b7fa1280adf11b84ea1e6fa
[INFO] running `Command { std: "docker" "start" "-a" "953cd93effebc7fe616fe1428652d35c629b6cf58b7fa1280adf11b84ea1e6fa", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/toy_problems.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `DIFFICULTIES` is never used
[INFO] [stdout]  --> src/toy_problems.rs:5:7
[INFO] [stdout]   |
[INFO] [stdout] 5 | const DIFFICULTIES: [&str; 3] = ["EASY", "MEDIUM", "HARD"];
[INFO] [stdout]   |       ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `CATEGORIES` is never used
[INFO] [stdout]  --> src/toy_problems.rs:6:7
[INFO] [stdout]   |
[INFO] [stdout] 6 | const CATEGORIES: [&str; 1] = ["Strings"];
[INFO] [stdout]   |       ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `difficulty` and `category` are never read
[INFO] [stdout]   --> src/toy_problems.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 9  | struct ToyProblem<'a> {
[INFO] [stdout]    |        ---------- fields in this struct
[INFO] [stdout] 10 |     name: &'a str,
[INFO] [stdout] 11 |     difficulty: &'a str,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 12 |     category: &'a str,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.19s
[INFO] running `Command { std: "docker" "inspect" "953cd93effebc7fe616fe1428652d35c629b6cf58b7fa1280adf11b84ea1e6fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "953cd93effebc7fe616fe1428652d35c629b6cf58b7fa1280adf11b84ea1e6fa", kill_on_drop: false }`
[INFO] [stdout] 953cd93effebc7fe616fe1428652d35c629b6cf58b7fa1280adf11b84ea1e6fa