[INFO] fetching crate mlo-chacha20-rs 0.1.2...
[INFO] checking mlo-chacha20-rs-0.1.2 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2
[INFO] extracting crate mlo-chacha20-rs 0.1.2 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate mlo-chacha20-rs 0.1.2 on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ab18db1cdaffc0526eae5f79a24364e360151a49e8cd13dc03dd61139c48964
[INFO] running `Command { std: "docker" "start" "-a" "9ab18db1cdaffc0526eae5f79a24364e360151a49e8cd13dc03dd61139c48964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ab18db1cdaffc0526eae5f79a24364e360151a49e8cd13dc03dd61139c48964", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ab18db1cdaffc0526eae5f79a24364e360151a49e8cd13dc03dd61139c48964", kill_on_drop: false }`
[INFO] [stdout] 9ab18db1cdaffc0526eae5f79a24364e360151a49e8cd13dc03dd61139c48964
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1d4207fe4e7e79438e5b44d3b55d9a120e1349bbcec71b90b01e87a065d73df3
[INFO] running `Command { std: "docker" "start" "-a" "1d4207fe4e7e79438e5b44d3b55d9a120e1349bbcec71b90b01e87a065d73df3", 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] 20 | |
[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/f609b7e0586f81fefb3523e3e17adf779ac416be/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-e0ee872a6f64065a.rlib
[INFO] [stdout]    = note: second definition in the local crate (`mlo_chacha20_rs`)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[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 2 previous errors
[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.by_ref() {
[INFO] [stdout]     |                          ~~~~~~~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[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.by_ref() {
[INFO] [stdout]     |                  ~~~~~~~~~
[INFO] [stdout] help: consider using `if let` to clear intent
[INFO] [stdout]     |
[INFO] [stdout] 590 |     if let Some(c) = iter.next() {
[INFO] [stdout]     |     ~~~~~~~~~~~~ ~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "1d4207fe4e7e79438e5b44d3b55d9a120e1349bbcec71b90b01e87a065d73df3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d4207fe4e7e79438e5b44d3b55d9a120e1349bbcec71b90b01e87a065d73df3", kill_on_drop: false }`
[INFO] [stdout] 1d4207fe4e7e79438e5b44d3b55d9a120e1349bbcec71b90b01e87a065d73df3