[INFO] fetching crate yaml-front-matter 0.1.0...
[INFO] building yaml-front-matter-0.1.0 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate yaml-front-matter 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate yaml-front-matter 0.1.0
[INFO] finished tweaking crates.io crate yaml-front-matter 0.1.0
[INFO] tweaked toml for crates.io crate yaml-front-matter 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate yaml-front-matter 0.1.0 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 14 packages to latest compatible versions
[INFO] [stderr]       Adding serde_yaml v0.8.26 (available: v0.9.34+deprecated)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 781a09c5760ad0c3506366dfd18413d2bded4f3f0433f64adc3cdb3a28f0481b
[INFO] running `Command { std: "docker" "start" "-a" "781a09c5760ad0c3506366dfd18413d2bded4f3f0433f64adc3cdb3a28f0481b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "781a09c5760ad0c3506366dfd18413d2bded4f3f0433f64adc3cdb3a28f0481b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "781a09c5760ad0c3506366dfd18413d2bded4f3f0433f64adc3cdb3a28f0481b", kill_on_drop: false }`
[INFO] [stdout] 781a09c5760ad0c3506366dfd18413d2bded4f3f0433f64adc3cdb3a28f0481b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 29e10e90764297b4ac1c6cc208ae6fd48ebf4ae833bea7bcca7a1ece88a8c07b
[INFO] running `Command { std: "docker" "start" "-a" "29e10e90764297b4ac1c6cc208ae6fd48ebf4ae833bea7bcca7a1ece88a8c07b", kill_on_drop: false }`
[INFO] [stderr]    Compiling indexmap v1.9.3
[INFO] [stderr]    Compiling yaml-rust v0.4.5
[INFO] [stderr]    Compiling serde_yaml v0.8.26
[INFO] [stderr]    Compiling yaml-front-matter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.41s
[INFO] running `Command { std: "docker" "inspect" "29e10e90764297b4ac1c6cc208ae6fd48ebf4ae833bea7bcca7a1ece88a8c07b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29e10e90764297b4ac1c6cc208ae6fd48ebf4ae833bea7bcca7a1ece88a8c07b", kill_on_drop: false }`
[INFO] [stdout] 29e10e90764297b4ac1c6cc208ae6fd48ebf4ae833bea7bcca7a1ece88a8c07b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8919a853d980b87798718a96bb08601cf9983213b6477e1437faff4e53ee67d6
[INFO] running `Command { std: "docker" "start" "-a" "8919a853d980b87798718a96bb08601cf9983213b6477e1437faff4e53ee67d6", kill_on_drop: false }`
[INFO] [stderr]    Compiling yaml-front-matter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `serde::__private`
[INFO] [stdout]    --> src/lib.rs:165:30
[INFO] [stdout]     |
[INFO] [stdout] 165 |     use serde::{Deserialize, __private::doc};
[INFO] [stdout]     |                              ^^^^^^^^^ could not find `__private` in `serde`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0659]: `doc` is ambiguous
[INFO] [stdout]    --> src/lib.rs:233:14
[INFO] [stdout]     |
[INFO] [stdout] 233 |     #[derive(Deserialize)]
[INFO] [stdout]     |              ^^^^^^^^^^^ ambiguous name
[INFO] [stdout]     |
[INFO] [stdout]     = note: ambiguous because of a name conflict with a builtin attribute
[INFO] [stdout]     = note: `doc` could refer to a built-in attribute
[INFO] [stdout] note: `doc` could also refer to the unresolved item imported here
[INFO] [stdout]    --> src/lib.rs:165:30
[INFO] [stdout]     |
[INFO] [stdout] 165 |     use serde::{Deserialize, __private::doc};
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^
[INFO] [stdout]     = help: use `self::doc` to refer to this unresolved item unambiguously
[INFO] [stdout]     = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0659.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `yaml-front-matter` (lib test) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8919a853d980b87798718a96bb08601cf9983213b6477e1437faff4e53ee67d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8919a853d980b87798718a96bb08601cf9983213b6477e1437faff4e53ee67d6", kill_on_drop: false }`
[INFO] [stdout] 8919a853d980b87798718a96bb08601cf9983213b6477e1437faff4e53ee67d6