[INFO] fetching crate mlo-chacha20-rs 0.1.2...
[INFO] testing mlo-chacha20-rs-0.1.2 against 1.90.0 for beta-1.91-3
[INFO] extracting crate mlo-chacha20-rs 0.1.2 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate mlo-chacha20-rs 0.1.2
[INFO] finished tweaking crates.io crate mlo-chacha20-rs 0.1.2
[INFO] tweaked toml for crates.io crate mlo-chacha20-rs 0.1.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mlo-chacha20-rs 0.1.2 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5509ffb6964a62b40c1be0b63fd26dc74f1c5560e9f9f4a5ee3f9d023c15ba3e
[INFO] running `Command { std: "docker" "start" "-a" "5509ffb6964a62b40c1be0b63fd26dc74f1c5560e9f9f4a5ee3f9d023c15ba3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5509ffb6964a62b40c1be0b63fd26dc74f1c5560e9f9f4a5ee3f9d023c15ba3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5509ffb6964a62b40c1be0b63fd26dc74f1c5560e9f9f4a5ee3f9d023c15ba3e", kill_on_drop: false }`
[INFO] [stdout] 5509ffb6964a62b40c1be0b63fd26dc74f1c5560e9f9f4a5ee3f9d023c15ba3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 30c0d127828d80ce110e981a5dc6fc15c08758fc19f6233c3060df993495ea08
[INFO] running `Command { std: "docker" "start" "-a" "30c0d127828d80ce110e981a5dc6fc15c08758fc19f6233c3060df993495ea08", kill_on_drop: false }`
[INFO] [stderr]    Compiling mlo-chacha20-rs v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: for loop over an `Option`. This is more readably written as an `if let` statement
[INFO] [stdout]    --> src/lib.rs:409:18
[INFO] [stdout]     |
[INFO] [stdout] 409 |         for c in iterator.next() {
[INFO] [stdout]     |                  ^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(for_loops_over_fallibles)]` on by default
[INFO] [stdout] help: to iterate over `iterator` remove the call to `next`
[INFO] [stdout]     |
[INFO] [stdout] 409 -         for c in iterator.next() {
[INFO] [stdout] 409 +         for c in iterator.by_ref() {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 409 -         for c in iterator.next() {
[INFO] [stdout] 409 +         if let Some(c) = iterator.next() {
[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/lib.rs:590:14
[INFO] [stdout]     |
[INFO] [stdout] 590 |     for c in iter.next() {
[INFO] [stdout]     |              ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: to iterate over `iter` remove the call to `next`
[INFO] [stdout]     |
[INFO] [stdout] 590 -     for c in iter.next() {
[INFO] [stdout] 590 +     for c in iter.by_ref() {
[INFO] [stdout]     |
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 590 -     for c in iter.next() {
[INFO] [stdout] 590 +     if let Some(c) = iter.next() {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "30c0d127828d80ce110e981a5dc6fc15c08758fc19f6233c3060df993495ea08", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "30c0d127828d80ce110e981a5dc6fc15c08758fc19f6233c3060df993495ea08", kill_on_drop: false }`
[INFO] [stdout] 30c0d127828d80ce110e981a5dc6fc15c08758fc19f6233c3060df993495ea08
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 264934962a7d43bd0046c29d980ce85a30d19b5a450b360c2b4aa08e11294f2b
[INFO] running `Command { std: "docker" "start" "-a" "264934962a7d43bd0046c29d980ce85a30d19b5a450b360c2b4aa08e11294f2b", kill_on_drop: false }`
[INFO] [stderr]    Compiling mlo-chacha20-rs v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: unwinding panics are not supported without std
[INFO] [stdout]   |
[INFO] [stdout]   = help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding
[INFO] [stdout]   = note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mlo-chacha20-rs` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "264934962a7d43bd0046c29d980ce85a30d19b5a450b360c2b4aa08e11294f2b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "264934962a7d43bd0046c29d980ce85a30d19b5a450b360c2b4aa08e11294f2b", kill_on_drop: false }`
[INFO] [stdout] 264934962a7d43bd0046c29d980ce85a30d19b5a450b360c2b4aa08e11294f2b