[INFO] fetching crate struct-variant 1.0.2...
[INFO] checking struct-variant-1.0.2 against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] extracting crate struct-variant 1.0.2 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate struct-variant 1.0.2 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 struct-variant 1.0.2
[INFO] finished tweaking crates.io crate struct-variant 1.0.2
[INFO] tweaked toml for crates.io crate struct-variant 1.0.2 written to /workspace/builds/worker-4/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] bac3d7da17ed07fd45d08fbe22807d8bbda89b01cc1b7bba27db8d52b6e19001
[INFO] running `Command { std: "docker" "start" "-a" "bac3d7da17ed07fd45d08fbe22807d8bbda89b01cc1b7bba27db8d52b6e19001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bac3d7da17ed07fd45d08fbe22807d8bbda89b01cc1b7bba27db8d52b6e19001", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bac3d7da17ed07fd45d08fbe22807d8bbda89b01cc1b7bba27db8d52b6e19001", kill_on_drop: false }`
[INFO] [stdout] bac3d7da17ed07fd45d08fbe22807d8bbda89b01cc1b7bba27db8d52b6e19001
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 2bfe233cb9fe06037d3399fa1c91a84fbf34c565c32172f014fa8b0310d8524e
[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" "2bfe233cb9fe06037d3399fa1c91a84fbf34c565c32172f014fa8b0310d8524e", kill_on_drop: false }`
[INFO] [stderr]    Compiling trybuild v1.0.42
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]     Checking struct-variant v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `paren_token`
[INFO] [stdout]   --> src/lib.rs:36:2
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub paren_token: Paren,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `enum_token`
[INFO] [stdout]    --> src/lib.rs:120:2
[INFO] [stdout]     |
[INFO] [stdout] 120 |     pub enum_token: Token![enum],
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `brace_token`
[INFO] [stdout]    --> src/lib.rs:123:2
[INFO] [stdout]     |
[INFO] [stdout] 123 |     pub brace_token: Brace,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling serde_derive v1.0.126
[INFO] [stderr]     Checking serde v1.0.126
[INFO] [stderr]     Checking toml v0.5.8
[INFO] [stderr]     Checking serde_json v1.0.64
[INFO] [stdout] warning: field is never read: `paren_token`
[INFO] [stdout]   --> src/lib.rs:36:2
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub paren_token: Paren,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `enum_token`
[INFO] [stdout]    --> src/lib.rs:120:2
[INFO] [stdout]     |
[INFO] [stdout] 120 |     pub enum_token: Token![enum],
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `brace_token`
[INFO] [stdout]    --> src/lib.rs:123:2
[INFO] [stdout]     |
[INFO] [stdout] 123 |     pub brace_token: Brace,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 19.74s
[INFO] running `Command { std: "docker" "inspect" "2bfe233cb9fe06037d3399fa1c91a84fbf34c565c32172f014fa8b0310d8524e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2bfe233cb9fe06037d3399fa1c91a84fbf34c565c32172f014fa8b0310d8524e", kill_on_drop: false }`
[INFO] [stdout] 2bfe233cb9fe06037d3399fa1c91a84fbf34c565c32172f014fa8b0310d8524e