[INFO] cloning repository https://github.com/kylewlacy/rust-conflicting-impl-specialization
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kylewlacy/rust-conflicting-impl-specialization" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylewlacy%2Frust-conflicting-impl-specialization", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylewlacy%2Frust-conflicting-impl-specialization'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e31c1e5305bc801850b7266e8817cda75342a948
[INFO] building kylewlacy/rust-conflicting-impl-specialization against master#ff34b919075f35a1787659e9c448a34b06bab8de for issue-85264
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkylewlacy%2Frust-conflicting-impl-specialization" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kylewlacy/rust-conflicting-impl-specialization on toolchain ff34b919075f35a1787659e9c448a34b06bab8de
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kylewlacy/rust-conflicting-impl-specialization
[INFO] finished tweaking git repo https://github.com/kylewlacy/rust-conflicting-impl-specialization
[INFO] tweaked toml for git repo https://github.com/kylewlacy/rust-conflicting-impl-specialization written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/kylewlacy/rust-conflicting-impl-specialization already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f0a6e9d659d240bcd54cc41200ebc555222ca135a08ab7c52feda52f5354419
[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" "8f0a6e9d659d240bcd54cc41200ebc555222ca135a08ab7c52feda52f5354419", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f0a6e9d659d240bcd54cc41200ebc555222ca135a08ab7c52feda52f5354419", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f0a6e9d659d240bcd54cc41200ebc555222ca135a08ab7c52feda52f5354419", kill_on_drop: false }`
[INFO] [stdout] 8f0a6e9d659d240bcd54cc41200ebc555222ca135a08ab7c52feda52f5354419
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "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" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+ff34b919075f35a1787659e9c448a34b06bab8de" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f7d531f319482ba0e70916c7cb76dfdff5527ad271ae5c48143c5d792bd319ff
[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" "f7d531f319482ba0e70916c7cb76dfdff5527ad271ae5c48143c5d792bd319ff", kill_on_drop: false }`
[INFO] [stderr]    Compiling child v0.1.0 (/opt/rustwide/workdir/child)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> child/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling conflicting-assoc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(incomplete_features)]` on by default
[INFO] [stdout]   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
[INFO] [stdout]   = help: consider using `min_specialization` instead, which is more stable and complete
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0119]: conflicting implementations of trait `Foo` for type `Alice`
[INFO] [stdout]   --> src/main.rs:35:1
[INFO] [stdout]    |
[INFO] [stdout] 30 |   impl Foo for Alice {
[INFO] [stdout]    |   ------------------ first implementation here
[INFO] [stdout] ...
[INFO] [stdout] 35 | / impl<T> Foo for T
[INFO] [stdout] 36 | |     where T: FooChild
[INFO] [stdout] 37 | | {
[INFO] [stdout] 38 | |     default fn foo(&self) { println!("Descendant foo!"); }
[INFO] [stdout] 39 | | }
[INFO] [stdout]    | |_^ conflicting implementation for `Alice`
[INFO] [stdout]    |
[INFO] [stdout]    = note: upstream crates may add a new impl of trait `child::Child` for type `()` in future versions
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0119`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `conflicting-assoc`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f7d531f319482ba0e70916c7cb76dfdff5527ad271ae5c48143c5d792bd319ff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f7d531f319482ba0e70916c7cb76dfdff5527ad271ae5c48143c5d792bd319ff", kill_on_drop: false }`
[INFO] [stdout] f7d531f319482ba0e70916c7cb76dfdff5527ad271ae5c48143c5d792bd319ff
