[INFO] fetching crate serde_magnus 0.11.0...
[INFO] checking serde_magnus-0.11.0 against try#70daa2c0d8eed7066b07966f3c0b0b8622bff4e4 for pr-151539
[INFO] extracting crate serde_magnus 0.11.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate serde_magnus 0.11.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate serde_magnus 0.11.0
[INFO] tweaked toml for crates.io crate serde_magnus 0.11.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde_magnus 0.11.0 on toolchain 70daa2c0d8eed7066b07966f3c0b0b8622bff4e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate serde_magnus 0.11.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 612603823c62f4a2ae3d56e9ce081783b35a3486ce27d6d2d2b68ca746840019
[INFO] running `Command { std: "docker" "start" "-a" "612603823c62f4a2ae3d56e9ce081783b35a3486ce27d6d2d2b68ca746840019", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "612603823c62f4a2ae3d56e9ce081783b35a3486ce27d6d2d2b68ca746840019", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "612603823c62f4a2ae3d56e9ce081783b35a3486ce27d6d2d2b68ca746840019", kill_on_drop: false }`
[INFO] [stdout] 612603823c62f4a2ae3d56e9ce081783b35a3486ce27d6d2d2b68ca746840019
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+70daa2c0d8eed7066b07966f3c0b0b8622bff4e4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3afdfce7fed80917916ed55e5d9f39e5f5d9b98b30fcdd4266e5212b47a023c8
[INFO] running `Command { std: "docker" "start" "-a" "3afdfce7fed80917916ed55e5d9f39e5f5d9b98b30fcdd4266e5212b47a023c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.172
[INFO] [stderr]    Compiling bindgen v0.69.5
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling bitflags v2.9.0
[INFO] [stderr]    Compiling lazycell v1.3.0
[INFO] [stderr]    Compiling shell-words v1.1.0
[INFO] [stderr]    Compiling clang-sys v1.8.1
[INFO] [stderr]    Compiling libloading v0.8.6
[INFO] [stderr]    Compiling itertools v0.12.1
[INFO] [stderr]    Compiling rb-sys-env v0.2.3
[INFO] [stderr]    Compiling seq-macro v0.3.6
[INFO] [stderr]    Compiling syn v2.0.101
[INFO] [stderr]    Compiling magnus v0.8.2
[INFO] [stderr]    Compiling serde_derive v1.0.219
[INFO] [stderr]    Compiling magnus-macros v0.8.0
[INFO] [stderr]     Checking serde v1.0.219
[INFO] [stderr]    Compiling rb-sys-build v0.9.124
[INFO] [stderr]    Compiling rb-sys v0.9.124
[INFO] [stderr]     Checking serde_bytes v0.11.17
[INFO] [stderr]     Checking serde_magnus v0.11.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_tuples.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     assert!(eval!(&ruby, "output == [ 1, 2, 3 ]", output)?);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_vecs.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert!(eval!(&ruby, "output == [ 1, 2, 3 ]", output)?);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_enums.rs:18:5
[INFO] [stdout]    |
[INFO] [stdout] 18 |     assert!(eval!(&ruby, "output == 'A'", output)?);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_vecs") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_enums") due to 1 previous error
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_results.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert!(eval!(&ruby, "output == { 'Ok' => 1234 }", output)?);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_results") due to 1 previous error
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_tuples") due to 1 previous error
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_arrays.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     assert!(eval!(&ruby, "output == [ 1, 2, 3 ]", output)?);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_arrays") due to 1 previous error
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]   --> tests/serializing_structs.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 32 | /     assert!(eval!(
[INFO] [stdout] 33 | |         &ruby,
[INFO] [stdout] 34 | |         "output == [ 1234, true, 'Hello, world!' ]",
[INFO] [stdout] 35 | |         output
[INFO] [stdout] 36 | |     )?);
[INFO] [stdout]    | |_______^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_magnus` (test "serializing_structs") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3afdfce7fed80917916ed55e5d9f39e5f5d9b98b30fcdd4266e5212b47a023c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3afdfce7fed80917916ed55e5d9f39e5f5d9b98b30fcdd4266e5212b47a023c8", kill_on_drop: false }`
[INFO] [stdout] 3afdfce7fed80917916ed55e5d9f39e5f5d9b98b30fcdd4266e5212b47a023c8