[INFO] fetching crate fastnbt 2.5.0...
[INFO] checking fastnbt-2.5.0 against master#8f43b85954d2f3d8fc00a7504c603e5ca9eb0695 for pr-133502-5
[INFO] extracting crate fastnbt 2.5.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate fastnbt 2.5.0 on toolchain 8f43b85954d2f3d8fc00a7504c603e5ca9eb0695
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8f43b85954d2f3d8fc00a7504c603e5ca9eb0695" "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-4-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" "+8f43b85954d2f3d8fc00a7504c603e5ca9eb0695" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded flate2 v1.0.27
[INFO] [stderr]   Downloaded derive_arbitrary v1.3.1
[INFO] [stderr]   Downloaded arbitrary v1.3.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.67
[INFO] [stderr]   Downloaded serde_json v1.0.107
[INFO] [stderr]   Downloaded syn v2.0.37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+8f43b85954d2f3d8fc00a7504c603e5ca9eb0695" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 651eef2c82ed0ce46314e934d2f729f570f0ba0cbea0c03c6015bc5076c04929
[INFO] running `Command { std: "docker" "start" "-a" "651eef2c82ed0ce46314e934d2f729f570f0ba0cbea0c03c6015bc5076c04929", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "651eef2c82ed0ce46314e934d2f729f570f0ba0cbea0c03c6015bc5076c04929", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "651eef2c82ed0ce46314e934d2f729f570f0ba0cbea0c03c6015bc5076c04929", kill_on_drop: false }`
[INFO] [stdout] 651eef2c82ed0ce46314e934d2f729f570f0ba0cbea0c03c6015bc5076c04929
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+8f43b85954d2f3d8fc00a7504c603e5ca9eb0695" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2d2f382dfc6efa03cb6e5a4f58d6ffce37ad000cd2ae74acbd5abc434be193e8
[INFO] running `Command { std: "docker" "start" "-a" "2d2f382dfc6efa03cb6e5a4f58d6ffce37ad000cd2ae74acbd5abc434be193e8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.67
[INFO] [stderr]    Compiling unicode-ident v1.0.12
[INFO] [stderr]    Compiling serde v1.0.188
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling serde_json v1.0.107
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking ryu v1.0.15
[INFO] [stderr]     Checking miniz_oxide v0.7.1
[INFO] [stderr]     Checking itoa v1.0.9
[INFO] [stderr]     Checking cesu8 v1.1.0
[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 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: 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(KnownEntity),
[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(Value),
[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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.04s
[INFO] running `Command { std: "docker" "inspect" "2d2f382dfc6efa03cb6e5a4f58d6ffce37ad000cd2ae74acbd5abc434be193e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d2f382dfc6efa03cb6e5a4f58d6ffce37ad000cd2ae74acbd5abc434be193e8", kill_on_drop: false }`
[INFO] [stdout] 2d2f382dfc6efa03cb6e5a4f58d6ffce37ad000cd2ae74acbd5abc434be193e8