Dec 19 10:30:55.629 INFO checking racer-rust/racer against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 10:30:55.629 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/racer-rust/racer:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 10:30:56.278 INFO [stdout] 0f30ca5e47ad07152ce8dfaec59fba464440d94b1b1f7b511a95b40bfb4835f3
Dec 19 10:30:56.286 INFO running `"docker" "start" "-a" "0f30ca5e47ad07152ce8dfaec59fba464440d94b1b1f7b511a95b40bfb4835f3"`
Dec 19 10:30:58.370 INFO [stderr]    Compiling rustc-rayon-core v0.1.1
Dec 19 10:30:58.370 INFO [stderr]     Checking rustc-ap-graphviz v306.0.0
Dec 19 10:30:58.370 INFO [stderr]    Compiling rustc-ap-rustc_target v306.0.0
Dec 19 10:30:58.374 INFO [stderr]     Checking scoped-tls v0.1.2
Dec 19 10:30:58.374 INFO [stderr]    Compiling rustc-ap-syntax v306.0.0
Dec 19 10:30:58.374 INFO [stderr]     Checking rls-span v0.4.0
Dec 19 10:30:58.381 INFO [stderr]     Checking rustc-ap-rustc_cratesio_shim v306.0.0
Dec 19 10:30:58.381 INFO [stderr]     Checking ena v0.11.0
Dec 19 10:30:58.924 INFO [stderr]     Checking smallvec v0.6.6
Dec 19 10:30:59.473 INFO [stderr]     Checking lock_api v0.1.5
Dec 19 10:30:59.534 INFO [stderr]    Compiling parking_lot_core v0.3.1
Dec 19 10:31:00.200 INFO [stderr]    Compiling derive_more v0.13.0
Dec 19 10:31:00.300 INFO [stderr]     Checking serde v1.0.80
Dec 19 10:31:00.316 INFO [stderr]     Checking env_logger v0.6.0
Dec 19 10:31:00.572 INFO [stderr]     Checking tempfile v3.0.5
Dec 19 10:31:00.776 INFO [stderr]     Checking rustc-ap-serialize v306.0.0
Dec 19 10:31:02.389 INFO [stderr] error[E0119]: conflicting implementations of trait `serialize::Encodable` for type `std::rc::Rc<_>`:
Dec 19 10:31:02.389 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-306.0.0/serialize.rs:893:1
Dec 19 10:31:02.390 INFO [stderr]     |
Dec 19 10:31:02.390 INFO [stderr] 589 | impl<T:Encodable> Encodable for Rc<T> {
Dec 19 10:31:02.390 INFO [stderr]     | ------------------------------------- first implementation here
Dec 19 10:31:02.391 INFO [stderr] ...
Dec 19 10:31:02.391 INFO [stderr] 893 | impl<T: ?Sized + UseSpecializedEncodable> Encodable for T {
Dec 19 10:31:02.391 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
Dec 19 10:31:02.392 INFO [stderr]     |
Dec 19 10:31:02.392 INFO [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedEncodable` for type `std::rc::Rc<_>`
Dec 19 10:31:02.392 INFO [stderr] 
Dec 19 10:31:02.396 INFO [stderr] error[E0119]: conflicting implementations of trait `serialize::Decodable` for type `std::rc::Rc<_>`:
Dec 19 10:31:02.396 INFO [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-serialize-306.0.0/serialize.rs:908:1
Dec 19 10:31:02.396 INFO [stderr]     |
Dec 19 10:31:02.396 INFO [stderr] 595 | impl<T:Decodable> Decodable for Rc<T> {
Dec 19 10:31:02.396 INFO [stderr]     | ------------------------------------- first implementation here
Dec 19 10:31:02.396 INFO [stderr] ...
Dec 19 10:31:02.396 INFO [stderr] 908 | impl<T: UseSpecializedDecodable> Decodable for T {
Dec 19 10:31:02.396 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
Dec 19 10:31:02.396 INFO [stderr]     |
Dec 19 10:31:02.396 INFO [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedDecodable` for type `std::rc::Rc<_>`
Dec 19 10:31:02.396 INFO [stderr] 
Dec 19 10:31:02.580 INFO [stderr] error: aborting due to 2 previous errors
Dec 19 10:31:02.580 INFO [stderr] 
Dec 19 10:31:02.580 INFO [stderr] For more information about this error, try `rustc --explain E0119`.
Dec 19 10:31:02.639 INFO [stderr] error: Could not compile `rustc-ap-serialize`.
Dec 19 10:31:02.639 INFO [stderr] warning: build failed, waiting for other jobs to finish...
Dec 19 10:31:17.015 INFO [stderr] error: build failed
Dec 19 10:31:17.612 INFO running `"docker" "inspect" "0f30ca5e47ad07152ce8dfaec59fba464440d94b1b1f7b511a95b40bfb4835f3"`
Dec 19 10:31:17.932 INFO running `"docker" "rm" "-f" "0f30ca5e47ad07152ce8dfaec59fba464440d94b1b1f7b511a95b40bfb4835f3"`
Dec 19 10:31:18.308 INFO [stdout] 0f30ca5e47ad07152ce8dfaec59fba464440d94b1b1f7b511a95b40bfb4835f3