[INFO] fetching crate kalgan_config 0.9.1...
[INFO] checking kalgan_config-0.9.1 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate kalgan_config 0.9.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate kalgan_config 0.9.1
[INFO] finished tweaking crates.io crate kalgan_config 0.9.1
[INFO] tweaked toml for crates.io crate kalgan_config 0.9.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate kalgan_config 0.9.1 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 14 packages to latest compatible versions
[INFO] [stderr]       Adding serde_yaml v0.8.26 (available: v0.9.34+deprecated)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3377566f6fecf03ff6410b6db7270a6ca0320ca06614768ee583f0f88117267e
[INFO] running `Command { std: "docker" "start" "-a" "3377566f6fecf03ff6410b6db7270a6ca0320ca06614768ee583f0f88117267e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3377566f6fecf03ff6410b6db7270a6ca0320ca06614768ee583f0f88117267e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3377566f6fecf03ff6410b6db7270a6ca0320ca06614768ee583f0f88117267e", kill_on_drop: false }`
[INFO] [stdout] 3377566f6fecf03ff6410b6db7270a6ca0320ca06614768ee583f0f88117267e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eb13abd1ca8cd74ac377db1284c75cf3ad3b1894c8bc4d8e1300b7b303acb577
[INFO] running `Command { std: "docker" "start" "-a" "eb13abd1ca8cd74ac377db1284c75cf3ad3b1894c8bc4d8e1300b7b303acb577", kill_on_drop: false }`
[INFO] [stderr]     Checking serde_yaml v0.8.26
[INFO] [stderr]     Checking kalgan_config v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]   --> src/parameters.rs:77:20
[INFO] [stdout]    |
[INFO] [stdout] 77 |     for element in map.as_mapping() {
[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] 77 -     for element in map.as_mapping() {
[INFO] [stdout] 77 +     while let Some(element) = map.as_mapping() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 77 -     for element in map.as_mapping() {
[INFO] [stdout] 77 +     if let Some(element) = map.as_mapping() {
[INFO] [stdout]    |
[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/parameters.rs:77:20
[INFO] [stdout]    |
[INFO] [stdout] 77 |     for element in map.as_mapping() {
[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] 77 -     for element in map.as_mapping() {
[INFO] [stdout] 77 +     while let Some(element) = map.as_mapping() {
[INFO] [stdout]    |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]    |
[INFO] [stdout] 77 -     for element in map.as_mapping() {
[INFO] [stdout] 77 +     if let Some(element) = map.as_mapping() {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.20s
[INFO] running `Command { std: "docker" "inspect" "eb13abd1ca8cd74ac377db1284c75cf3ad3b1894c8bc4d8e1300b7b303acb577", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb13abd1ca8cd74ac377db1284c75cf3ad3b1894c8bc4d8e1300b7b303acb577", kill_on_drop: false }`
[INFO] [stdout] eb13abd1ca8cd74ac377db1284c75cf3ad3b1894c8bc4d8e1300b7b303acb577