[INFO] fetching crate serde-object 0.0.0-alpha.0...
[INFO] checking serde-object-0.0.0-alpha.0 against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] extracting crate serde-object 0.0.0-alpha.0 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate serde-object 0.0.0-alpha.0 on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde-object 0.0.0-alpha.0
[INFO] finished tweaking crates.io crate serde-object 0.0.0-alpha.0
[INFO] tweaked toml for crates.io crate serde-object 0.0.0-alpha.0 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5fd45c972c9ef29f339bd99aba85edb51fe47eb4ff9d8a5b4fd5229c4527fbc
[INFO] running `Command { std: "docker" "start" "-a" "d5fd45c972c9ef29f339bd99aba85edb51fe47eb4ff9d8a5b4fd5229c4527fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5fd45c972c9ef29f339bd99aba85edb51fe47eb4ff9d8a5b4fd5229c4527fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5fd45c972c9ef29f339bd99aba85edb51fe47eb4ff9d8a5b4fd5229c4527fbc", kill_on_drop: false }`
[INFO] [stdout] d5fd45c972c9ef29f339bd99aba85edb51fe47eb4ff9d8a5b4fd5229c4527fbc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f804b14d60f21b034ad60439a4fa58cb01167c2d32bf17e6290216c319a21065
[INFO] running `Command { std: "docker" "start" "-a" "f804b14d60f21b034ad60439a4fa58cb01167c2d32bf17e6290216c319a21065", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]     Checking wyz v0.2.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling try_match_inner v0.2.0
[INFO] [stderr]     Checking try_match v0.2.2
[INFO] [stderr]     Checking serde-object v0.0.0-alpha.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/lib.rs:665:10
[INFO] [stdout]     |
[INFO] [stdout] 665 |         };
[INFO] [stdout]     |          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/lib.rs:665:10
[INFO] [stdout]     |
[INFO] [stdout] 665 |         };
[INFO] [stdout]     |          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/assistant.rs:93:31
[INFO] [stdout]    |
[INFO] [stdout] 93 |                     .pipe(|a| Any::downcast_ref::<Assistant>(a))
[INFO] [stdout]    |                               ^^^ help: use `dyn`: `<dyn Any>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]     --> src/lib.rs:1006:31
[INFO] [stdout]      |
[INFO] [stdout] 1006 |     fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
[INFO] [stdout]      |                               ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fields`
[INFO] [stdout]     --> src/lib.rs:1018:9
[INFO] [stdout]      |
[INFO] [stdout] 1018 |         fields: &'static [&'static str],
[INFO] [stdout]      |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fields`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/assistant.rs:93:31
[INFO] [stdout]    |
[INFO] [stdout] 93 |                     .pipe(|a| Any::downcast_ref::<Assistant>(a))
[INFO] [stdout]    |                               ^^^ help: use `dyn`: `<dyn Any>`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `len`
[INFO] [stdout]     --> src/lib.rs:1006:31
[INFO] [stdout]      |
[INFO] [stdout] 1006 |     fn tuple_variant<V>(self, len: usize, visitor: V) -> Result<V::Value, Self::Error>
[INFO] [stdout]      |                               ^^^ help: if this is intentional, prefix it with an underscore: `_len`
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `fields`
[INFO] [stdout]     --> src/lib.rs:1018:9
[INFO] [stdout]      |
[INFO] [stdout] 1018 |         fields: &'static [&'static str],
[INFO] [stdout]      |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_fields`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.13s
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f804b14d60f21b034ad60439a4fa58cb01167c2d32bf17e6290216c319a21065", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f804b14d60f21b034ad60439a4fa58cb01167c2d32bf17e6290216c319a21065", kill_on_drop: false }`
[INFO] [stdout] f804b14d60f21b034ad60439a4fa58cb01167c2d32bf17e6290216c319a21065