[INFO] fetching crate mlo-chacha20-rs 0.1.2...
[INFO] checking mlo-chacha20-rs-0.1.2 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate mlo-chacha20-rs 0.1.2 into /workspace/builds/worker-5-tc2/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-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mlo-chacha20-rs 0.1.2 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] 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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] e37df150b54d244e64983d410ab7e20cd580ce0e0bd3c6496c9bcfb9562b5e74
[INFO] running `Command { std: "docker" "start" "-a" "e37df150b54d244e64983d410ab7e20cd580ce0e0bd3c6496c9bcfb9562b5e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e37df150b54d244e64983d410ab7e20cd580ce0e0bd3c6496c9bcfb9562b5e74", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e37df150b54d244e64983d410ab7e20cd580ce0e0bd3c6496c9bcfb9562b5e74", kill_on_drop: false }`
[INFO] [stdout] e37df150b54d244e64983d410ab7e20cd580ce0e0bd3c6496c9bcfb9562b5e74
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] aa7f23ac0b1cec61624003c19de4a778164a84ff6dc9d68eb4d48618ad24bdd9
[INFO] running `Command { std: "docker" "start" "-a" "aa7f23ac0b1cec61624003c19de4a778164a84ff6dc9d68eb4d48618ad24bdd9", kill_on_drop: false }`
[INFO] [stderr]     Checking mlo-chacha20-rs v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0152]: found duplicate lang item `panic_impl`
[INFO] [stdout]   --> src/lib.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 12 | / fn panic(_info: &PanicInfo) -> ! {
[INFO] [stdout] 13 | |
[INFO] [stdout] 14 | |     // The panic handler might send a signal to the process.
[INFO] [stdout] 15 | |     unsafe {
[INFO] [stdout] ...  |
[INFO] [stdout] 21 | | }
[INFO] [stdout]    | |_^
[INFO] [stdout]    |
[INFO] [stdout]    = note: the lang item is first defined in crate `std` (which `test` depends on)
[INFO] [stdout]    = note: first definition in `std` loaded from /opt/rustwide/rustup-home/toolchains/c659ee110de67e82444e4b6c8407c1a9af9c2cf6/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-95d69415fb7e848a.rlib
[INFO] [stdout]    = note: second definition in the local crate (`mlo_chacha20_rs`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0152`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mlo-chacha20-rs` (lib test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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] running `Command { std: "docker" "inspect" "aa7f23ac0b1cec61624003c19de4a778164a84ff6dc9d68eb4d48618ad24bdd9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa7f23ac0b1cec61624003c19de4a778164a84ff6dc9d68eb4d48618ad24bdd9", kill_on_drop: false }`
[INFO] [stdout] aa7f23ac0b1cec61624003c19de4a778164a84ff6dc9d68eb4d48618ad24bdd9