[INFO] fetching crate ciclo 0.1.0...
[INFO] checking ciclo-0.1.0 against master#38352b01ae4af9300be03b805d6db68c45e51068 for pr-129864
[INFO] extracting crate ciclo 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate ciclo 0.1.0 on toolchain 38352b01ae4af9300be03b805d6db68c45e51068
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-5-tc1/source/.cargo/config.toml
[INFO] started tweaking crates.io crate ciclo 0.1.0
[INFO] finished tweaking crates.io crate ciclo 0.1.0
[INFO] tweaked toml for crates.io crate ciclo 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 3 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b662a195b55c49bef887d0bb6a54712aade7387ab5084f0481837ca0fa062c18
[INFO] running `Command { std: "docker" "start" "-a" "b662a195b55c49bef887d0bb6a54712aade7387ab5084f0481837ca0fa062c18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b662a195b55c49bef887d0bb6a54712aade7387ab5084f0481837ca0fa062c18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b662a195b55c49bef887d0bb6a54712aade7387ab5084f0481837ca0fa062c18", kill_on_drop: false }`
[INFO] [stdout] b662a195b55c49bef887d0bb6a54712aade7387ab5084f0481837ca0fa062c18
[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" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 83cf51c5867d31d7d9c94409058ca5aec0198e6f44d3cd733984c06a6ee3a3cf
[INFO] running `Command { std: "docker" "start" "-a" "83cf51c5867d31d7d9c94409058ca5aec0198e6f44d3cd733984c06a6ee3a3cf", kill_on_drop: false }`
[INFO] [stderr]     Checking ciclo v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/all_cycles.rs:11:22
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for paths in graph.remove(&key) {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 11 |         while let Some(paths) = graph.remove(&key) {
[INFO] [stdout]    |         ~~~~~~~~~~~~~~~     ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 11 |         if let Some(paths) = graph.remove(&key) {
[INFO] [stdout]    |         ~~~~~~~~~~~~     ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/all_cycles.rs:11:22
[INFO] [stdout]    |
[INFO] [stdout] 11 |         for paths in graph.remove(&key) {
[INFO] [stdout]    |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to check pattern in a loop use `while let`
[INFO] [stdout]    |
[INFO] [stdout] 11 |         while let Some(paths) = graph.remove(&key) {
[INFO] [stdout]    |         ~~~~~~~~~~~~~~~     ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 11 |         if let Some(paths) = graph.remove(&key) {
[INFO] [stdout]    |         ~~~~~~~~~~~~     ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "83cf51c5867d31d7d9c94409058ca5aec0198e6f44d3cd733984c06a6ee3a3cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "83cf51c5867d31d7d9c94409058ca5aec0198e6f44d3cd733984c06a6ee3a3cf", kill_on_drop: false }`
[INFO] [stdout] 83cf51c5867d31d7d9c94409058ca5aec0198e6f44d3cd733984c06a6ee3a3cf