[INFO] crate smoltcp 0.6.0 is already in cache
[INFO] checking smoltcp-0.6.0 against try#d7b51666469c792a8a3f40849607739bae1e705e for pr-71665
[INFO] extracting crate smoltcp 0.6.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate smoltcp 0.6.0 on toolchain d7b51666469c792a8a3f40849607739bae1e705e
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d7b51666469c792a8a3f40849607739bae1e705e" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-3/source/Cargo.toml
[INFO] crate crates.io crate smoltcp 0.6.0 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d7b51666469c792a8a3f40849607739bae1e705e" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "/opt/rustwide/cargo-home/bin/cargo" "+d7b51666469c792a8a3f40849607739bae1e705e" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 26c4b17f11850f8a9f65cd0b2e94ea8c86cddef051c3b9f8b11afab3a407697a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "26c4b17f11850f8a9f65cd0b2e94ea8c86cddef051c3b9f8b11afab3a407697a"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking ucd-util v0.1.5
[INFO] [stderr]     Checking smallvec v0.6.10
[INFO] [stderr]     Checking utf8-ranges v1.0.3
[INFO] [stderr]     Checking managed v0.7.1
[INFO] [stderr]     Checking unicode-width v0.1.5
[INFO] [stderr]     Checking humantime v1.2.0
[INFO] [stderr]     Checking aho-corasick v0.7.4
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.6.10
[INFO] [stderr]     Checking getopts v0.2.19
[INFO] [stderr]     Checking unicode-normalization v0.1.8
[INFO] [stderr]     Checking smoltcp v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stderr]   --> src/phy/sys/mod.rs:29:27
[INFO] [stderr]    |
[INFO] [stderr] 29 |         let mut readfds = mem::uninitialized::<libc::fd_set>();
[INFO] [stderr]    |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stderr]   --> src/phy/sys/mod.rs:33:28
[INFO] [stderr]    |
[INFO] [stderr] 33 |         let mut writefds = mem::uninitialized::<libc::fd_set>();
[INFO] [stderr]    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'core::mem::uninitialized': use `mem::MaybeUninit` instead
[INFO] [stderr]   --> src/phy/sys/mod.rs:36:29
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let mut exceptfds = mem::uninitialized::<libc::fd_set>();
[INFO] [stderr]    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]     Checking regex v1.2.0
[INFO] [stderr] error: unused return value of `core::mem::replace` that must be used
[INFO] [stderr]    --> src/iface/neighbor.rs:107:21
[INFO] [stderr]     |
[INFO] [stderr] 107 |                     mem::replace(map, new_btree_map);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr] note: the lint level is defined here
[INFO] [stderr]    --> src/lib.rs:4:98
[INFO] [stderr]     |
[INFO] [stderr] 4   | #![cfg_attr(all(any(feature = "proto-ipv4", feature = "proto-ipv6"), feature = "ethernet"), deny(unused))]
[INFO] [stderr]     |                                                                                                  ^^^^^^
[INFO] [stderr]     = note: `#[deny(unused_must_use)]` implied by `#[deny(unused)]`
[INFO] [stderr]     = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `smoltcp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "26c4b17f11850f8a9f65cd0b2e94ea8c86cddef051c3b9f8b11afab3a407697a"`
[INFO] running `"docker" "rm" "-f" "26c4b17f11850f8a9f65cd0b2e94ea8c86cddef051c3b9f8b11afab3a407697a"`
[INFO] [stdout] 26c4b17f11850f8a9f65cd0b2e94ea8c86cddef051c3b9f8b11afab3a407697a