[INFO] fetching crate fastnbt 2.5.0...
[INFO] checking fastnbt-2.5.0 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] extracting crate fastnbt 2.5.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate fastnbt 2.5.0 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 fastnbt 2.5.0
[INFO] finished tweaking crates.io crate fastnbt 2.5.0
[INFO] tweaked toml for crates.io crate fastnbt 2.5.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate crates.io crate fastnbt 2.5.0 already has a lockfile, it will not be regenerated
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_arbitrary v1.3.1
[INFO] [stderr]   Downloaded arbitrary v1.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 9e27f3d96fc41235eda17645fc72cf1f861d299b76f7292d936ccc3427887bce
[INFO] running `Command { std: "docker" "start" "-a" "9e27f3d96fc41235eda17645fc72cf1f861d299b76f7292d936ccc3427887bce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e27f3d96fc41235eda17645fc72cf1f861d299b76f7292d936ccc3427887bce", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e27f3d96fc41235eda17645fc72cf1f861d299b76f7292d936ccc3427887bce", kill_on_drop: false }`
[INFO] [stdout] 9e27f3d96fc41235eda17645fc72cf1f861d299b76f7292d936ccc3427887bce
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] f4b0678bfab86853c2d4dae6fe3707aeaaea465046548c2d2bba5c352ec507e8
[INFO] running `Command { std: "docker" "start" "-a" "f4b0678bfab86853c2d4dae6fe3707aeaaea465046548c2d2bba5c352ec507e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.67
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]     Checking cesu8 v1.1.0
[INFO] [stderr]     Checking miniz_oxide v0.7.1
[INFO] [stderr]     Checking flate2 v1.0.27
[INFO] [stderr]    Compiling quote v1.0.33
[INFO] [stderr]    Compiling syn v2.0.37
[INFO] [stderr]    Compiling serde_derive v1.0.188
[INFO] [stderr]     Checking serde_bytes v0.11.12
[INFO] [stderr]     Checking serde_json v1.0.107
[INFO] [stderr]     Checking fastnbt v2.5.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `ser` is never read
[INFO] [stdout]   --> src/value/array_serializer.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct ArraySerializer<'a> {
[INFO] [stdout]    |            --------------- field in this struct
[INFO] [stdout] 11 |     pub ser: &'a mut Serializer,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `serde_json::to_writer`
[INFO] [stdout]   --> src/test/ser.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use serde_json::to_writer;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `ser` is never read
[INFO] [stdout]   --> src/value/array_serializer.rs:11:9
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct ArraySerializer<'a> {
[INFO] [stdout]    |            --------------- field in this struct
[INFO] [stdout] 11 |     pub ser: &'a mut Serializer,
[INFO] [stdout]    |         ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/test/minecraft_chunk.rs:68:15
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Known(KnownEntity),
[INFO] [stdout]    |         ----- ^^^^^^^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Entity` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 68 |         Known(()),
[INFO] [stdout]    |               ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]   --> src/test/minecraft_chunk.rs:69:17
[INFO] [stdout]    |
[INFO] [stdout] 69 |         Unknown(Value),
[INFO] [stdout]    |         ------- ^^^^^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         field in this variant
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Entity` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]    |
[INFO] [stdout] 69 |         Unknown(()),
[INFO] [stdout]    |                 ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `block_states` is never read
[INFO] [stdout]    --> src/test/minecraft_chunk.rs:115:13
[INFO] [stdout]     |
[INFO] [stdout] 113 |     pub struct Section<'a> {
[INFO] [stdout]     |                ------- field in this struct
[INFO] [stdout] 114 |         #[serde(borrow)]
[INFO] [stdout] 115 |         pub block_states: Option<&'a [u8]>,
[INFO] [stdout]     |             ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Section` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.87s
[INFO] running `Command { std: "docker" "inspect" "f4b0678bfab86853c2d4dae6fe3707aeaaea465046548c2d2bba5c352ec507e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4b0678bfab86853c2d4dae6fe3707aeaaea465046548c2d2bba5c352ec507e8", kill_on_drop: false }`
[INFO] [stdout] f4b0678bfab86853c2d4dae6fe3707aeaaea465046548c2d2bba5c352ec507e8