[INFO] fetching crate serde_traitobject 0.1.6...
[INFO] checking serde_traitobject-0.1.6 against try#ea663bba38739867a4b75ac820991b4f5d093c3b for pr-62262-1
[INFO] extracting crate serde_traitobject 0.1.6 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate serde_traitobject 0.1.6 on toolchain ea663bba38739867a4b75ac820991b4f5d093c3b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate serde_traitobject 0.1.6
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate serde_traitobject 0.1.6
[INFO] tweaked toml for crates.io crate serde_traitobject 0.1.6 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+ea663bba38739867a4b75ac820991b4f5d093c3b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 101ba93155de2533746670d5347d81926e9db9c5565c3ac6d8ec4c19800b0c31
[INFO] running `"docker" "start" "-a" "101ba93155de2533746670d5347d81926e9db9c5565c3ac6d8ec4c19800b0c31"`
[INFO] [stderr]    Compiling heapless v0.5.1
[INFO] [stderr]     Checking twox-hash v1.5.0
[INFO] [stderr]     Checking metatype v0.1.2
[INFO] [stderr]    Compiling procinfo v0.4.2
[INFO] [stderr]     Checking generic-array v0.13.2
[INFO] [stderr]     Checking hash32 v0.1.0
[INFO] [stderr]     Checking uuid v0.7.4
[INFO] [stderr]     Checking erased-serde v0.3.9
[INFO] [stderr]     Checking palaver v0.2.8
[INFO] [stderr]     Checking build_id v0.1.5
[INFO] [stderr]     Checking relative v0.1.5
[INFO] [stderr]     Checking serde_closure v0.1.5
[INFO] [stderr]     Checking serde_traitobject v0.1.6 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0520]: `serialize_sized` specializes an item from a parent `impl`, but that item is not marked `default`
[INFO] [stderr]    --> src/lib.rs:266:3
[INFO] [stderr]     |
[INFO] [stderr] 263 |       impl<T: serde::ser::Serialize + ?Sized> Sealed for T {}
[INFO] [stderr]     |       ------------------------------------------------------- parent `impl` is here
[INFO] [stderr] ...
[INFO] [stderr] 266 |           fn serialize_sized<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
[INFO] [stderr]     |  _________^
[INFO] [stderr] 267 | |         where
[INFO] [stderr] 268 | |             S: serde::Serializer,
[INFO] [stderr] 269 | |             Self: Sized,
[INFO] [stderr] 270 | |         {
[INFO] [stderr] 271 | |             serde::ser::Serialize::serialize(self, serializer)
[INFO] [stderr] 272 | |         }
[INFO] [stderr]     | |_________^ cannot specialize default item `serialize_sized`
[INFO] [stderr]     |
[INFO] [stderr]     = note: to specialize, `serialize_sized` in the parent `impl` must be marked `default`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0520`.
[INFO] [stderr] error: could not compile `serde_traitobject`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "101ba93155de2533746670d5347d81926e9db9c5565c3ac6d8ec4c19800b0c31"`
[INFO] running `"docker" "rm" "-f" "101ba93155de2533746670d5347d81926e9db9c5565c3ac6d8ec4c19800b0c31"`
[INFO] [stdout] 101ba93155de2533746670d5347d81926e9db9c5565c3ac6d8ec4c19800b0c31