[INFO] cloning repository https://github.com/vjancik/serde_bug
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vjancik/serde_bug" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvjancik%2Fserde_bug", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvjancik%2Fserde_bug'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d96913c9f6acdc99179a80168ec89b1a70172d9a
[INFO] testing vjancik/serde_bug against try#17092ad00ed8fe1e7f81a7e38238ff70779034b1 for pr-140985
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvjancik%2Fserde_bug" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vjancik/serde_bug on toolchain 17092ad00ed8fe1e7f81a7e38238ff70779034b1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vjancik/serde_bug
[INFO] finished tweaking git repo https://github.com/vjancik/serde_bug
[INFO] tweaked toml for git repo https://github.com/vjancik/serde_bug written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/vjancik/serde_bug 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" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2ac4e38610a2b745775b8201d611c759f2cf41ea846a0cef63c2864c7bda4a2d
[INFO] running `Command { std: "docker" "start" "-a" "2ac4e38610a2b745775b8201d611c759f2cf41ea846a0cef63c2864c7bda4a2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ac4e38610a2b745775b8201d611c759f2cf41ea846a0cef63c2864c7bda4a2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ac4e38610a2b745775b8201d611c759f2cf41ea846a0cef63c2864c7bda4a2d", kill_on_drop: false }`
[INFO] [stdout] 2ac4e38610a2b745775b8201d611c759f2cf41ea846a0cef63c2864c7bda4a2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fc19b97bf076a78db0c3762acd5f49ce2258c2277008c224f683f42522d89629
[INFO] running `Command { std: "docker" "start" "-a" "fc19b97bf076a78db0c3762acd5f49ce2258c2277008c224f683f42522d89629", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.58
[INFO] [stderr]    Compiling serde_derive v1.0.119
[INFO] [stderr]    Compiling serde v1.0.119
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling serde_bug v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `optional` and `notoptional` are never read
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct TestStruct {
[INFO] [stdout]   |        ---------- fields in this struct
[INFO] [stdout] 7 |     #[serde(deserialize_with ="callback")]
[INFO] [stdout] 8 |     optional: Option<i32>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 9 |     notoptional: i32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TestStruct` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.64s
[INFO] running `Command { std: "docker" "inspect" "fc19b97bf076a78db0c3762acd5f49ce2258c2277008c224f683f42522d89629", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc19b97bf076a78db0c3762acd5f49ce2258c2277008c224f683f42522d89629", kill_on_drop: false }`
[INFO] [stdout] fc19b97bf076a78db0c3762acd5f49ce2258c2277008c224f683f42522d89629
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+17092ad00ed8fe1e7f81a7e38238ff70779034b1" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7cf80ff18b3de49413273890e17cc08a53fd7aa5ea88e5ecfc04fa4f0c9670cd
[INFO] running `Command { std: "docker" "start" "-a" "7cf80ff18b3de49413273890e17cc08a53fd7aa5ea88e5ecfc04fa4f0c9670cd", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_bug v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `optional` and `notoptional` are never read
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct TestStruct {
[INFO] [stdout]   |        ---------- fields in this struct
[INFO] [stdout] 7 |     #[serde(deserialize_with ="callback")]
[INFO] [stdout] 8 |     optional: Option<i32>,
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout] 9 |     notoptional: i32,
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `TestStruct` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_bug` (bin "serde_bug" test); 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   No space left on device (os error 28)
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   failed to parse process output: `/opt/rustwide/rustup-home/toolchains/17092ad00ed8fe1e7f81a7e38238ff70779034b1/bin/rustc --crate-name serde_bug --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --test --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values())' -C metadata=5a0863bc25cc73e1 -C extra-filename=-e7f821552130f9ca --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern serde=/opt/rustwide/target/debug/deps/libserde-3024531d55014cf1.rlib --extern toml=/opt/rustwide/target/debug/deps/libtoml-77eca9a99f2f2f0c.rlib --cap-lints=forbid` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "7cf80ff18b3de49413273890e17cc08a53fd7aa5ea88e5ecfc04fa4f0c9670cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cf80ff18b3de49413273890e17cc08a53fd7aa5ea88e5ecfc04fa4f0c9670cd", kill_on_drop: false }`
[INFO] [stdout] 7cf80ff18b3de49413273890e17cc08a53fd7aa5ea88e5ecfc04fa4f0c9670cd