[INFO] fetching crate message_plugins 0.2.0...
[INFO] checking message_plugins-0.2.0 against try#a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d for pr-145342-1
[INFO] extracting crate message_plugins 0.2.0 into /workspace/builds/worker-2-tc2/source
[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-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate message_plugins 0.2.0 on toolchain a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "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" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 31 packages to latest compatible versions
[INFO] [stderr]       Adding libloading v0.6.7 (available: v0.8.8)
[INFO] [stderr]       Adding tokio v0.2.25 (available: v1.47.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c526c6c565e2b254097c9110f89457de68b375a557dac8267f53528a63b6f9c3
[INFO] running `Command { std: "docker" "start" "-a" "c526c6c565e2b254097c9110f89457de68b375a557dac8267f53528a63b6f9c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c526c6c565e2b254097c9110f89457de68b375a557dac8267f53528a63b6f9c3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c526c6c565e2b254097c9110f89457de68b375a557dac8267f53528a63b6f9c3", kill_on_drop: false }`
[INFO] [stdout] c526c6c565e2b254097c9110f89457de68b375a557dac8267f53528a63b6f9c3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+a4980311fb7bb9e7893708e6bd3fbbfb2819fd3d" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 05af80b56fbe75fb480e0c25d3f92838a09d1980f96d907b4e60c668ce92d922
[INFO] running `Command { std: "docker" "start" "-a" "05af80b56fbe75fb480e0c25d3f92838a09d1980f96d907b4e60c668ce92d922", 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: 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.41s
[INFO] running `Command { std: "docker" "inspect" "05af80b56fbe75fb480e0c25d3f92838a09d1980f96d907b4e60c668ce92d922", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "05af80b56fbe75fb480e0c25d3f92838a09d1980f96d907b4e60c668ce92d922", kill_on_drop: false }`
[INFO] [stdout] 05af80b56fbe75fb480e0c25d3f92838a09d1980f96d907b4e60c668ce92d922