[INFO] crate rustc-ap-serialize 308.0.0 is already in cache
[INFO] extracting crate rustc-ap-serialize 308.0.0 into work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/reg/rustc-ap-serialize/308.0.0
[INFO] extracting crate rustc-ap-serialize 308.0.0 into work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/rustc-ap-serialize/308.0.0
[INFO] validating manifest of rustc-ap-serialize-308.0.0 on toolchain master#d99a320cba42f661aebfa1293b7b2ec3603dda75
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rustc-ap-serialize-308.0.0 on toolchain try#e70472fc501b855c9080f3772432c10fe20b8866
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rustc-ap-serialize-308.0.0
[INFO] finished frobbing rustc-ap-serialize-308.0.0
[INFO] frobbed toml for rustc-ap-serialize-308.0.0 written to work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/reg/rustc-ap-serialize/308.0.0/Cargo.toml
[INFO] started frobbing rustc-ap-serialize-308.0.0
[INFO] finished frobbing rustc-ap-serialize-308.0.0
[INFO] frobbed toml for rustc-ap-serialize-308.0.0 written to work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/rustc-ap-serialize/308.0.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking rustc-ap-serialize-308.0.0 against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-5/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/reg/rustc-ap-serialize/308.0.0:/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"`
[INFO] [stdout] 826403e83305512cfa6fcfc455cc2b010f52b1950f71d3a486498cb51c641bb9
[INFO] running `"docker" "start" "-a" "826403e83305512cfa6fcfc455cc2b010f52b1950f71d3a486498cb51c641bb9"`
[INFO] [stderr]     Checking rustc-ap-serialize v308.0.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0119]: conflicting implementations of trait `serialize::Encodable` for type `std::rc::Rc<_>`:
[INFO] [stderr]    --> serialize.rs:893:1
[INFO] [stderr]     |
[INFO] [stderr] 589 | impl<T:Encodable> Encodable for Rc<T> {
[INFO] [stderr]     | ------------------------------------- first implementation here
[INFO] [stderr] ...
[INFO] [stderr] 893 | impl<T: ?Sized + UseSpecializedEncodable> Encodable for T {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
[INFO] [stderr]     |
[INFO] [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedEncodable` for type `std::rc::Rc<_>`
[INFO] [stderr] 
[INFO] [stderr] error[E0119]: conflicting implementations of trait `serialize::Decodable` for type `std::rc::Rc<_>`:
[INFO] [stderr]    --> serialize.rs:908:1
[INFO] [stderr]     |
[INFO] [stderr] 595 | impl<T:Decodable> Decodable for Rc<T> {
[INFO] [stderr]     | ------------------------------------- first implementation here
[INFO] [stderr] ...
[INFO] [stderr] 908 | impl<T: UseSpecializedDecodable> Decodable for T {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
[INFO] [stderr]     |
[INFO] [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedDecodable` for type `std::rc::Rc<_>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0119`.
[INFO] [stderr] error: Could not compile `rustc-ap-serialize`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0119]: conflicting implementations of trait `serialize::Encodable` for type `std::rc::Rc<_>`:
[INFO] [stderr]    --> serialize.rs:893:1
[INFO] [stderr]     |
[INFO] [stderr] 589 | impl<T:Encodable> Encodable for Rc<T> {
[INFO] [stderr]     | ------------------------------------- first implementation here
[INFO] [stderr] ...
[INFO] [stderr] 893 | impl<T: ?Sized + UseSpecializedEncodable> Encodable for T {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
[INFO] [stderr]     |
[INFO] [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedEncodable` for type `std::rc::Rc<_>`
[INFO] [stderr] 
[INFO] [stderr] error[E0119]: conflicting implementations of trait `serialize::Decodable` for type `std::rc::Rc<_>`:
[INFO] [stderr]    --> serialize.rs:908:1
[INFO] [stderr]     |
[INFO] [stderr] 595 | impl<T:Decodable> Decodable for Rc<T> {
[INFO] [stderr]     | ------------------------------------- first implementation here
[INFO] [stderr] ...
[INFO] [stderr] 908 | impl<T: UseSpecializedDecodable> Decodable for T {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `std::rc::Rc<_>`
[INFO] [stderr]     |
[INFO] [stderr]     = note: downstream crates may implement trait `serialize::UseSpecializedDecodable` for type `std::rc::Rc<_>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0119`.
[INFO] [stderr] error: Could not compile `rustc-ap-serialize`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "826403e83305512cfa6fcfc455cc2b010f52b1950f71d3a486498cb51c641bb9"`
[INFO] running `"docker" "rm" "-f" "826403e83305512cfa6fcfc455cc2b010f52b1950f71d3a486498cb51c641bb9"`
[INFO] [stdout] 826403e83305512cfa6fcfc455cc2b010f52b1950f71d3a486498cb51c641bb9