[INFO] fetching crate smoltcp 0.6.0...
[INFO] testing smoltcp-0.6.0 against try#03a1ea71b075ab964b5278bc6e74cd6c52c36ee0 for pr-74409
[INFO] extracting crate smoltcp 0.6.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate smoltcp 0.6.0 on toolchain 03a1ea71b075ab964b5278bc6e74cd6c52c36ee0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate smoltcp 0.6.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate smoltcp 0.6.0
[INFO] tweaked toml for crates.io crate smoltcp 0.6.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate smoltcp 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d0466a2d3d33ddf0a50358c034ff94de0ca4ee1984d9c73e7a44d00f9b43dea
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7d0466a2d3d33ddf0a50358c034ff94de0ca4ee1984d9c73e7a44d00f9b43dea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d0466a2d3d33ddf0a50358c034ff94de0ca4ee1984d9c73e7a44d00f9b43dea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d0466a2d3d33ddf0a50358c034ff94de0ca4ee1984d9c73e7a44d00f9b43dea", kill_on_drop: false }`
[INFO] [stdout] 7d0466a2d3d33ddf0a50358c034ff94de0ca4ee1984d9c73e7a44d00f9b43dea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:38e1b949b06cde1964af550a6e548bd9b2b2ea170003ae122f8fc0886596cc07" "/opt/rustwide/cargo-home/bin/cargo" "+03a1ea71b075ab964b5278bc6e74cd6c52c36ee0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0cd04eb764c1053a8cc5c32f25847f2b9844d07814d7d3efd4cf327a8d8e33a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d0cd04eb764c1053a8cc5c32f25847f2b9844d07814d7d3efd4cf327a8d8e33a", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling managed v0.7.1
[INFO] [stderr]    Compiling smoltcp v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/phy/sys/mod.rs:29:27
[INFO] [stdout]    |
[INFO] [stdout] 29 |         let mut readfds = mem::uninitialized::<libc::fd_set>();
[INFO] [stdout]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/phy/sys/mod.rs:33:28
[INFO] [stdout]    |
[INFO] [stdout] 33 |         let mut writefds = mem::uninitialized::<libc::fd_set>();
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/phy/sys/mod.rs:36:29
[INFO] [stdout]    |
[INFO] [stdout] 36 |         let mut exceptfds = mem::uninitialized::<libc::fd_set>();
[INFO] [stdout]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: unused return value of `core::mem::replace` that must be used
[INFO] [stdout]    --> src/iface/neighbor.rs:107:21
[INFO] [stdout]     |
[INFO] [stdout] 107 |                     mem::replace(map, new_btree_map);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:4:98
[INFO] [stdout]     |
[INFO] [stdout] 4   | #![cfg_attr(all(any(feature = "proto-ipv4", feature = "proto-ipv6"), feature = "ethernet"), deny(unused))]
[INFO] [stdout]     |                                                                                                  ^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_must_use)]` implied by `#[deny(unused)]`
[INFO] [stdout]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `smoltcp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d0cd04eb764c1053a8cc5c32f25847f2b9844d07814d7d3efd4cf327a8d8e33a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0cd04eb764c1053a8cc5c32f25847f2b9844d07814d7d3efd4cf327a8d8e33a", kill_on_drop: false }`
[INFO] [stdout] d0cd04eb764c1053a8cc5c32f25847f2b9844d07814d7d3efd4cf327a8d8e33a