[INFO] cloning repository https://github.com/UnHumbleBen/serde-tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/UnHumbleBen/serde-tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnHumbleBen%2Fserde-tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnHumbleBen%2Fserde-tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cf3ef9af0f449ed6c74e67ce5a867643c7d38fab
[INFO] checking UnHumbleBen/serde-tutorial against master#9fa580b1175018b0a276b0bc68f9827a106f7260 for pr-82565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FUnHumbleBen%2Fserde-tutorial" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/UnHumbleBen/serde-tutorial on toolchain 9fa580b1175018b0a276b0bc68f9827a106f7260
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/UnHumbleBen/serde-tutorial
[INFO] finished tweaking git repo https://github.com/UnHumbleBen/serde-tutorial
[INFO] tweaked toml for git repo https://github.com/UnHumbleBen/serde-tutorial written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/UnHumbleBen/serde-tutorial already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 783bf4ad284c1bfd0a736f4aa5ed5768c827380767dba1eb5a651680f8ae9a04
[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" "783bf4ad284c1bfd0a736f4aa5ed5768c827380767dba1eb5a651680f8ae9a04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "783bf4ad284c1bfd0a736f4aa5ed5768c827380767dba1eb5a651680f8ae9a04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "783bf4ad284c1bfd0a736f4aa5ed5768c827380767dba1eb5a651680f8ae9a04", kill_on_drop: false }`
[INFO] [stdout] 783bf4ad284c1bfd0a736f4aa5ed5768c827380767dba1eb5a651680f8ae9a04
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9fa580b1175018b0a276b0bc68f9827a106f7260" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e8aa9c005bff76db88781c628c9101832253fdc15b8e6988d7ef2a67d910a5c8
[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" "e8aa9c005bff76db88781c628c9101832253fdc15b8e6988d7ef2a67d910a5c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.1
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.3
[INFO] [stderr]    Compiling serde v1.0.99
[INFO] [stderr]    Compiling ryu v1.0.0
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking phantom-data v0.1.0 (/opt/rustwide/workdir/phantom-data)
[INFO] [stdout] warning: struct is never constructed: `Iter`
[INFO] [stdout]   --> phantom-data/src/main.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct Iter<'a, T: 'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vec`
[INFO] [stdout]   --> phantom-data/src/main.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | struct Vec<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Iter`
[INFO] [stdout]   --> phantom-data/src/main.rs:38:8
[INFO] [stdout]    |
[INFO] [stdout] 38 | struct Iter<'a, T: 'a> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Vec`
[INFO] [stdout]   --> phantom-data/src/main.rs:61:8
[INFO] [stdout]    |
[INFO] [stdout] 61 | struct Vec<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling serde_derive v1.0.99
[INFO] [stderr]    Compiling serde_repr v0.1.5
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking implement-deserialize-for-a-custom-map-type v0.1.0 (/opt/rustwide/workdir/implement-deserialize-for-a-custom-map-type)
[INFO] [stderr]     Checking attributes v0.1.0 (/opt/rustwide/workdir/attributes)
[INFO] [stderr]     Checking serialize-enum-as-number v0.1.0 (/opt/rustwide/workdir/serialize-enum-as-number)
[INFO] [stderr]     Checking handwritten-generic-type-bound v0.1.0 (/opt/rustwide/workdir/handwritten-generic-type-bounds)
[INFO] [stderr]     Checking using-derive v0.1.0 (/opt/rustwide/workdir/using-derive)
[INFO] [stderr]     Checking custom-serialization v0.1.0 (/opt/rustwide/workdir/custom-serialization)
[INFO] [stderr]     Checking deriving-de-serialize-for-type-in-a-different-crate v0.1.0 (/opt/rustwide/workdir/deriving-de-serialize-for-type-in-a-different-crate)
[INFO] [stderr]     Checking skip-serializing-field v0.1.0 (/opt/rustwide/workdir/skip-serializing-field)
[INFO] [stderr]     Checking serialize-fields-as-camelcase v0.1.0 (/opt/rustwide/workdir/serialize-fields-as-camelcase)
[INFO] [stderr]     Checking struct-flattening v0.1.0 (/opt/rustwide/workdir/struct-flattening)
[INFO] [stderr]     Checking processing-an-array-of-values-without-buffering-into-a-vec v0.1.0 (/opt/rustwide/workdir/processing-an-array-of-values-without-buffering-into-a-vec)
[INFO] [stderr]     Checking manually-implementing-deserialize-for-a-struct v0.1.0 (/opt/rustwide/workdir/manually-implementing-deserialize-for-a-struct)
[INFO] [stderr]     Checking enum-representations v0.1.0 (/opt/rustwide/workdir/enum-representations)
[INFO] [stderr]     Checking discarding-data v0.1.0 (/opt/rustwide/workdir/discarding-data)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:28:10
[INFO] [stdout]    |
[INFO] [stdout] 28 |         };
[INFO] [stdout]    |          ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `secs`
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     secs: u64,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nanos`
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     nanos: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Ref`
[INFO] [stdout]   --> handwritten-generic-type-bounds/src/main.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     Ref(&'a T),
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking the-visitor-trait v0.1.0 (/opt/rustwide/workdir/the-visitor-trait)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> processing-an-array-of-values-without-buffering-into-a-vec/src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     id: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `hash`
[INFO] [stdout]  --> skip-serializing-field/src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     hash: String,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Ref`
[INFO] [stdout]   --> handwritten-generic-type-bounds/src/main.rs:60:5
[INFO] [stdout]    |
[INFO] [stdout] 60 |     Ref(&'a T),
[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] [stderr]     Checking default-value-for-a-field v0.1.0 (/opt/rustwide/workdir/default-value-for-a-field)
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:28:10
[INFO] [stdout]    |
[INFO] [stdout] 28 |         };
[INFO] [stdout]    |          ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `secs`
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     secs: u64,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `nanos`
[INFO] [stdout]   --> manually-implementing-deserialize-for-a-struct/src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     nanos: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> processing-an-array-of-values-without-buffering-into-a-vec/src/main.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     id: String,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `hash`
[INFO] [stdout]  --> skip-serializing-field/src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     hash: String,
[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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.10s
[INFO] running `Command { std: "docker" "inspect" "e8aa9c005bff76db88781c628c9101832253fdc15b8e6988d7ef2a67d910a5c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8aa9c005bff76db88781c628c9101832253fdc15b8e6988d7ef2a67d910a5c8", kill_on_drop: false }`
[INFO] [stdout] e8aa9c005bff76db88781c628c9101832253fdc15b8e6988d7ef2a67d910a5c8