[INFO] fetching crate syn-serde 0.3.1...
[INFO] checking syn-serde-0.3.1 against master#8549802939cd01111c46e34a7b67cb1933977af9 for pr-132712
[INFO] extracting crate syn-serde 0.3.1 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate syn-serde 0.3.1 on toolchain 8549802939cd01111c46e34a7b67cb1933977af9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8549802939cd01111c46e34a7b67cb1933977af9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syn-serde 0.3.1
[INFO] finished tweaking crates.io crate syn-serde 0.3.1
[INFO] tweaked toml for crates.io crate syn-serde 0.3.1 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8549802939cd01111c46e34a7b67cb1933977af9" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8549802939cd01111c46e34a7b67cb1933977af9" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+8549802939cd01111c46e34a7b67cb1933977af9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 64ab2c21820bb2402989199e35a2fdef442f98be2ececd7a7b9c3f6d5801043d
[INFO] running `Command { std: "docker" "start" "-a" "64ab2c21820bb2402989199e35a2fdef442f98be2ececd7a7b9c3f6d5801043d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "64ab2c21820bb2402989199e35a2fdef442f98be2ececd7a7b9c3f6d5801043d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64ab2c21820bb2402989199e35a2fdef442f98be2ececd7a7b9c3f6d5801043d", kill_on_drop: false }`
[INFO] [stdout] 64ab2c21820bb2402989199e35a2fdef442f98be2ececd7a7b9c3f6d5801043d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+8549802939cd01111c46e34a7b67cb1933977af9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2819986bf3bf136dd6e6dff06337e7c58da0ae4b84519dc726ac6fea95c38024
[INFO] running `Command { std: "docker" "start" "-a" "2819986bf3bf136dd6e6dff06337e7c58da0ae4b84519dc726ac6fea95c38024", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.89
[INFO] [stderr]    Compiling serde v1.0.214
[INFO] [stderr]     Checking quote v1.0.37
[INFO] [stderr]     Checking syn v2.0.87
[INFO] [stderr]     Checking serde_json v1.0.132
[INFO] [stderr]    Compiling serde_derive v1.0.214
[INFO] [stderr]     Checking syn-serde v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: could not find `json` in `syn_serde`
[INFO] [stdout]    --> tests/test_item.rs:9:47
[INFO] [stdout]     |
[INFO] [stdout] 9   |     println!("actual:\n```\n{}\n", syn_serde::json::to_string_pretty(actual));
[INFO] [stdout]     |                                               ^^^^ could not find `json` in `syn_serde`
[INFO] [stdout]     |
[INFO] [stdout] note: found an item that was configured out
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:276:9
[INFO] [stdout]     |
[INFO] [stdout] 276 | pub mod json;
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] note: the item is gated behind the `json` feature
[INFO] [stdout]    --> /opt/rustwide/workdir/src/lib.rs:274:7
[INFO] [stdout]     |
[INFO] [stdout] 274 | #[cfg(feature = "json")]
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syn-serde` (test "test_item") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "2819986bf3bf136dd6e6dff06337e7c58da0ae4b84519dc726ac6fea95c38024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2819986bf3bf136dd6e6dff06337e7c58da0ae4b84519dc726ac6fea95c38024", kill_on_drop: false }`
[INFO] [stdout] 2819986bf3bf136dd6e6dff06337e7c58da0ae4b84519dc726ac6fea95c38024