[INFO] fetching crate two-sided-vec 0.1.9...
[INFO] checking two-sided-vec-0.1.9 against try#d990716b6a1fdde1300748828a9c9e79dfd0b898 for pr-74846
[INFO] extracting crate two-sided-vec 0.1.9 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate two-sided-vec 0.1.9 on toolchain d990716b6a1fdde1300748828a9c9e79dfd0b898
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate two-sided-vec 0.1.9
[INFO] finished tweaking crates.io crate two-sided-vec 0.1.9
[INFO] tweaked toml for crates.io crate two-sided-vec 0.1.9 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a35969aaaa6ca383b6445bb7f7da5195248b06b90e7379a8a982c6c3cce5e5bf
[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" "a35969aaaa6ca383b6445bb7f7da5195248b06b90e7379a8a982c6c3cce5e5bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a35969aaaa6ca383b6445bb7f7da5195248b06b90e7379a8a982c6c3cce5e5bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a35969aaaa6ca383b6445bb7f7da5195248b06b90e7379a8a982c6c3cce5e5bf", kill_on_drop: false }`
[INFO] [stdout] a35969aaaa6ca383b6445bb7f7da5195248b06b90e7379a8a982c6c3cce5e5bf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+d990716b6a1fdde1300748828a9c9e79dfd0b898" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 16e4680b5f19c81b2435ef0dab87d3f25eedc77ae91823a8fb7f0b67f9b514ac
[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" "16e4680b5f19c81b2435ef0dab87d3f25eedc77ae91823a8fb7f0b67f9b514ac", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking two-sided-vec v0.1.9 (/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/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     specialization, // Used to improve extend performance
[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] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_test v1.0.115
[INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
[INFO] [stdout]  --> src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     specialization, // Used to improve extend performance
[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] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `two_sided_vec::TwoSidedVec<{integer}>: serde::ser::Serialize` is not satisfied
[INFO] [stdout]   --> tests/basic.rs:81:5
[INFO] [stdout]    |
[INFO] [stdout] 81 |     ::serde_test::assert_tokens(&values, &[
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `serde::ser::Serialize` is not implemented for `two_sided_vec::TwoSidedVec<{integer}>`
[INFO] [stdout]    | 
[INFO] [stdout]   ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_test-1.0.115/src/assert.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     T: Serialize + Deserialize<'de> + PartialEq + Debug,
[INFO] [stdout]    |        --------- required by this bound in `serde_test::assert_tokens`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `two_sided_vec::TwoSidedVec<{integer}>: serde::de::Deserialize<'_>` is not satisfied
[INFO] [stdout]   --> tests/basic.rs:81:5
[INFO] [stdout]    |
[INFO] [stdout] 81 |     ::serde_test::assert_tokens(&values, &[
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `serde::de::Deserialize<'_>` is not implemented for `two_sided_vec::TwoSidedVec<{integer}>`
[INFO] [stdout]    | 
[INFO] [stdout]   ::: /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_test-1.0.115/src/assert.rs:33:20
[INFO] [stdout]    |
[INFO] [stdout] 33 |     T: Serialize + Deserialize<'de> + PartialEq + Debug,
[INFO] [stdout]    |                    ---------------- required by this bound in `serde_test::assert_tokens`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `two-sided-vec`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "16e4680b5f19c81b2435ef0dab87d3f25eedc77ae91823a8fb7f0b67f9b514ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16e4680b5f19c81b2435ef0dab87d3f25eedc77ae91823a8fb7f0b67f9b514ac", kill_on_drop: false }`
[INFO] [stdout] 16e4680b5f19c81b2435ef0dab87d3f25eedc77ae91823a8fb7f0b67f9b514ac