[INFO] fetching crate arsc 0.1.5...
[INFO] checking arsc-0.1.5 against master#5ad98b4026d5172f27615b105658bc8bfd677be8 for pr-129422
[INFO] extracting crate arsc 0.1.5 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate arsc 0.1.5 on toolchain 5ad98b4026d5172f27615b105658bc8bfd677be8
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arsc 0.1.5
[INFO] finished tweaking crates.io crate arsc 0.1.5
[INFO] tweaked toml for crates.io crate arsc 0.1.5 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 15 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 309edd1d0c0553812d490eff2d04befea0ac080f13cabef592a196d0d7e66c1d
[INFO] running `Command { std: "docker" "start" "-a" "309edd1d0c0553812d490eff2d04befea0ac080f13cabef592a196d0d7e66c1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "309edd1d0c0553812d490eff2d04befea0ac080f13cabef592a196d0d7e66c1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "309edd1d0c0553812d490eff2d04befea0ac080f13cabef592a196d0d7e66c1d", kill_on_drop: false }`
[INFO] [stdout] 309edd1d0c0553812d490eff2d04befea0ac080f13cabef592a196d0d7e66c1d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+5ad98b4026d5172f27615b105658bc8bfd677be8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf5607f78f33a6343619cd8e0dfff34a14a6616d96be42a80014ea12e9a65607
[INFO] running `Command { std: "docker" "start" "-a" "cf5607f78f33a6343619cd8e0dfff34a14a6616d96be42a80014ea12e9a65607", kill_on_drop: false }`
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking arsc v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking walkdir v2.5.0
[INFO] [stdout] warning: for loop over a `&Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/writer/components_writing.rs:290:22
[INFO] [stdout]     |
[INFO] [stdout] 290 |         for specs in &self.specs {
[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] 290 |         while let Some(specs) = &self.specs {
[INFO] [stdout]     |         ~~~~~~~~~~~~~~~     ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 290 |         if let Some(specs) = &self.specs {
[INFO] [stdout]     |         ~~~~~~~~~~~~     ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: for loop over a `&Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/writer/components_writing.rs:290:22
[INFO] [stdout]     |
[INFO] [stdout] 290 |         for specs in &self.specs {
[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] 290 |         while let Some(specs) = &self.specs {
[INFO] [stdout]     |         ~~~~~~~~~~~~~~~     ~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 290 |         if let Some(specs) = &self.specs {
[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 0.75s
[INFO] running `Command { std: "docker" "inspect" "cf5607f78f33a6343619cd8e0dfff34a14a6616d96be42a80014ea12e9a65607", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf5607f78f33a6343619cd8e0dfff34a14a6616d96be42a80014ea12e9a65607", kill_on_drop: false }`
[INFO] [stdout] cf5607f78f33a6343619cd8e0dfff34a14a6616d96be42a80014ea12e9a65607