[INFO] fetching crate struct_to_string 0.2.0...
[INFO] building struct_to_string-0.2.0 against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] extracting crate struct_to_string 0.2.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate struct_to_string 0.2.0
[INFO] finished tweaking crates.io crate struct_to_string 0.2.0
[INFO] tweaked toml for crates.io crate struct_to_string 0.2.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate struct_to_string 0.2.0 on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9bb8a87611ded6721b09eb0feb0e8efe25d83289df71377d95cc9150b647e445
[INFO] running `Command { std: "docker" "start" "-a" "9bb8a87611ded6721b09eb0feb0e8efe25d83289df71377d95cc9150b647e445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9bb8a87611ded6721b09eb0feb0e8efe25d83289df71377d95cc9150b647e445", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bb8a87611ded6721b09eb0feb0e8efe25d83289df71377d95cc9150b647e445", kill_on_drop: false }`
[INFO] [stdout] 9bb8a87611ded6721b09eb0feb0e8efe25d83289df71377d95cc9150b647e445
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e4ddb134b6bf07729da6295a7d9be016c55559fd4501dc978a52aed061151da5
[INFO] running `Command { std: "docker" "start" "-a" "e4ddb134b6bf07729da6295a7d9be016c55559fd4501dc978a52aed061151da5", kill_on_drop: false }`
[INFO] [stderr]    Compiling struct_to_string v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.30s
[INFO] running `Command { std: "docker" "inspect" "e4ddb134b6bf07729da6295a7d9be016c55559fd4501dc978a52aed061151da5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4ddb134b6bf07729da6295a7d9be016c55559fd4501dc978a52aed061151da5", kill_on_drop: false }`
[INFO] [stdout] e4ddb134b6bf07729da6295a7d9be016c55559fd4501dc978a52aed061151da5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61a42bb1e57e7414e8e9b26fd4c89f93ccf36e8f95e5f87640ba8af65779a46f
[INFO] running `Command { std: "docker" "start" "-a" "61a42bb1e57e7414e8e9b26fd4c89f93ccf36e8f95e5f87640ba8af65779a46f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling struct_to_string v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: multiple fields are never read
[INFO] [stdout]   --> tests/integration_tests.rs:6:5
[INFO] [stdout]    |
[INFO] [stdout]  5 | struct ComprehensiveTestStruct {
[INFO] [stdout]    |        ----------------------- fields in this struct
[INFO] [stdout]  6 |     int_field: i32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]  7 |     uint_field: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]  8 |     float_field: f64,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]  9 |     bool_field: bool,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 10 |     char_field: char,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 11 |     str_field: String,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 12 |     option_field: Option<i32>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 13 |     array_field: [i32; 3],
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 14 |     slice_field: Vec<i32>,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 15 |     tuple_field: (i32, String),
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 16 |     tuple_struct_field: TupleStruct,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 17 |     enum_field: AnEnum,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 18 |     nested_struct_field: NestedStruct,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0`, `1`, and `2` are never read
[INFO] [stdout]   --> tests/integration_tests.rs:21:20
[INFO] [stdout]    |
[INFO] [stdout] 21 | struct TupleStruct(i32, f64, String);
[INFO] [stdout]    |        ----------- ^^^  ^^^  ^^^^^^
[INFO] [stdout]    |        |
[INFO] [stdout]    |        fields in this struct
[INFO] [stdout]    |
[INFO] [stdout]    = help: consider removing these fields
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `nested_field` is never read
[INFO] [stdout]   --> tests/integration_tests.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | struct NestedStruct {
[INFO] [stdout]    |        ------------ field in this struct
[INFO] [stdout] 24 |     nested_field: i32,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Variant1`, `Variant2`, and `Variant3` are never constructed
[INFO] [stdout]   --> tests/integration_tests.rs:28:5
[INFO] [stdout]    |
[INFO] [stdout] 27 | enum AnEnum {
[INFO] [stdout]    |      ------ variants in this enum
[INFO] [stdout] 28 |     Variant1,
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 29 |     Variant2(i32),
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 30 |     Variant3 { x: i32, y: i32 },
[INFO] [stdout]    |     ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 4.87s
[INFO] running `Command { std: "docker" "inspect" "61a42bb1e57e7414e8e9b26fd4c89f93ccf36e8f95e5f87640ba8af65779a46f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61a42bb1e57e7414e8e9b26fd4c89f93ccf36e8f95e5f87640ba8af65779a46f", kill_on_drop: false }`
[INFO] [stdout] 61a42bb1e57e7414e8e9b26fd4c89f93ccf36e8f95e5f87640ba8af65779a46f