[INFO] fetching crate message_plugins 0.2.0...
[INFO] checking message_plugins-0.2.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate message_plugins 0.2.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate message_plugins 0.2.0 on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate message_plugins 0.2.0
[INFO] finished tweaking crates.io crate message_plugins 0.2.0
[INFO] tweaked toml for crates.io crate message_plugins 0.2.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 33 packages to latest compatible versions
[INFO] [stderr]       Adding bytes v0.5.6 (latest: v1.7.1)
[INFO] [stderr]       Adding hermit-abi v0.3.9 (latest: v0.4.0)
[INFO] [stderr]       Adding libloading v0.6.7 (latest: v0.8.5)
[INFO] [stderr]       Adding pin-project-lite v0.1.12 (latest: v0.2.14)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.77)
[INFO] [stderr]       Adding tokio v0.2.25 (latest: v1.40.0)
[INFO] [stderr]       Adding tokio-macros v0.2.6 (latest: v2.4.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6ea0c38146fd9dfaf5ced109a13ae73c48407a4c7e869e6a7dade0c99239d40f
[INFO] running `Command { std: "docker" "start" "-a" "6ea0c38146fd9dfaf5ced109a13ae73c48407a4c7e869e6a7dade0c99239d40f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6ea0c38146fd9dfaf5ced109a13ae73c48407a4c7e869e6a7dade0c99239d40f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6ea0c38146fd9dfaf5ced109a13ae73c48407a4c7e869e6a7dade0c99239d40f", kill_on_drop: false }`
[INFO] [stdout] 6ea0c38146fd9dfaf5ced109a13ae73c48407a4c7e869e6a7dade0c99239d40f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b661eeca2d0bacbc9494d438f8af33811d4b08a83306caaf0588fcf7f7c1193c
[INFO] running `Command { std: "docker" "start" "-a" "b661eeca2d0bacbc9494d438f8af33811d4b08a83306caaf0588fcf7f7c1193c", kill_on_drop: false }`
[INFO] [stderr]     Checking libloading v0.6.7
[INFO] [stderr]     Checking message_plugins v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: references are not nullable, so checking them for null will always return false
[INFO] [stdout]    --> src/lib.rs:220:12
[INFO] [stdout]     |
[INFO] [stdout] 220 |         if ((*instance.as_ptr()).as_ref() as *const dyn Plugin<T>).is_null() {
[INFO] [stdout]     |            ^-----------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             expression has type `&dyn Plugin<T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(useless_ptr_null_checks)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Option<&dyn Any>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:256:29
[INFO] [stdout]     |
[INFO] [stdout] 256 | pub type FfiPluginInit<T> = unsafe extern "C" fn(*mut Box<dyn Plugin<T>>, Option<&dyn Any>);
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]     = note: enum has no representation hint
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: references are not nullable, so checking them for null will always return false
[INFO] [stdout]    --> src/lib.rs:220:12
[INFO] [stdout]     |
[INFO] [stdout] 220 |         if ((*instance.as_ptr()).as_ref() as *const dyn Plugin<T>).is_null() {
[INFO] [stdout]     |            ^-----------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             expression has type `&dyn Plugin<T>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(useless_ptr_null_checks)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` fn uses type `Option<&dyn Any>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:256:29
[INFO] [stdout]     |
[INFO] [stdout] 256 | pub type FfiPluginInit<T> = unsafe extern "C" fn(*mut Box<dyn Plugin<T>>, Option<&dyn Any>);
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
[INFO] [stdout]     = note: enum has no representation hint
[INFO] [stdout]     = note: `#[warn(improper_ctypes_definitions)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.38s
[INFO] running `Command { std: "docker" "inspect" "b661eeca2d0bacbc9494d438f8af33811d4b08a83306caaf0588fcf7f7c1193c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b661eeca2d0bacbc9494d438f8af33811d4b08a83306caaf0588fcf7f7c1193c", kill_on_drop: false }`
[INFO] [stdout] b661eeca2d0bacbc9494d438f8af33811d4b08a83306caaf0588fcf7f7c1193c