[INFO] cloning repository https://github.com/AHSPONTES/building_a_library
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AHSPONTES/building_a_library" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAHSPONTES%2Fbuilding_a_library", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAHSPONTES%2Fbuilding_a_library'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b4e81747aa8b98ed4e5a47105b60e9f82cca14ca
[INFO] checking AHSPONTES/building_a_library against try#47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268 for pr-149058
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAHSPONTES%2Fbuilding_a_library" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/AHSPONTES/building_a_library
[INFO] finished tweaking git repo https://github.com/AHSPONTES/building_a_library
[INFO] tweaked toml for git repo https://github.com/AHSPONTES/building_a_library written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/AHSPONTES/building_a_library on toolchain 47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/AHSPONTES/building_a_library 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" "+47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aeee355b515af4f61d57fb490a3dba577d6a98a5e68d71ef30364cb0f3ed6e5d
[INFO] running `Command { std: "docker" "start" "-a" "aeee355b515af4f61d57fb490a3dba577d6a98a5e68d71ef30364cb0f3ed6e5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aeee355b515af4f61d57fb490a3dba577d6a98a5e68d71ef30364cb0f3ed6e5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aeee355b515af4f61d57fb490a3dba577d6a98a5e68d71ef30364cb0f3ed6e5d", kill_on_drop: false }`
[INFO] [stdout] aeee355b515af4f61d57fb490a3dba577d6a98a5e68d71ef30364cb0f3ed6e5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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@sha256:94a0c148923f5b2b52a63ef0eeb1882ad339ab61bce784c8077cbe41c61feb6c" "/opt/rustwide/cargo-home/bin/cargo" "+47eaa3b85fbe5fa2b3b731b5fecdc5954cbfc268" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa75b940075e310be077b769821fd672a6a509f88bb2ae8f0224f87fd8bfe520
[INFO] running `Command { std: "docker" "start" "-a" "aa75b940075e310be077b769821fd672a6a509f88bb2ae8f0224f87fd8bfe520", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde_json v1.0.64
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking building_a_library v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `serde_json::Result`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use serde_json::Result;
[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 import: `serde_json::Result`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use serde_json::Result;
[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 `Result` that must be used
[INFO] [stdout]   --> src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     serde_json::to_writer(file, &d);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = serde_json::to_writer(file, &d);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/main.rs:27:5
[INFO] [stdout]    |
[INFO] [stdout] 27 |     serde_json::to_writer(file, &d);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = serde_json::to_writer(file, &d);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 10.94s
[INFO] running `Command { std: "docker" "inspect" "aa75b940075e310be077b769821fd672a6a509f88bb2ae8f0224f87fd8bfe520", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa75b940075e310be077b769821fd672a6a509f88bb2ae8f0224f87fd8bfe520", kill_on_drop: false }`
[INFO] [stdout] aa75b940075e310be077b769821fd672a6a509f88bb2ae8f0224f87fd8bfe520
