[INFO] fetching crate serde_bson 0.0.1...
[INFO] building serde_bson-0.0.1 against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] extracting crate serde_bson 0.0.1 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate serde_bson 0.0.1
[INFO] finished tweaking crates.io crate serde_bson 0.0.1
[INFO] tweaked toml for crates.io crate serde_bson 0.0.1 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde_bson 0.0.1 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]      Locking 102 packages to latest compatible versions
[INFO] [stderr]       Adding bson v1.2.4 (available: v3.0.0)
[INFO] [stderr]       Adding criterion v0.3.6 (available: v0.7.0)
[INFO] [stderr]       Adding rand v0.8.5 (available: v0.9.2)
[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] 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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2971a589f83de1299933a5c04bdccb0d07b55ae04b56b16d4d86f97e3df8f86
[INFO] running `Command { std: "docker" "start" "-a" "a2971a589f83de1299933a5c04bdccb0d07b55ae04b56b16d4d86f97e3df8f86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2971a589f83de1299933a5c04bdccb0d07b55ae04b56b16d4d86f97e3df8f86", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2971a589f83de1299933a5c04bdccb0d07b55ae04b56b16d4d86f97e3df8f86", kill_on_drop: false }`
[INFO] [stdout] a2971a589f83de1299933a5c04bdccb0d07b55ae04b56b16d4d86f97e3df8f86
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] df8cce867cc4387c44837926d472ccb3f42e6d1085f1557164d16036aa35180a
[INFO] running `Command { std: "docker" "start" "-a" "df8cce867cc4387c44837926d472ccb3f42e6d1085f1557164d16036aa35180a", kill_on_drop: false }`
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling serde_bson v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.01s
[INFO] running `Command { std: "docker" "inspect" "df8cce867cc4387c44837926d472ccb3f42e6d1085f1557164d16036aa35180a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df8cce867cc4387c44837926d472ccb3f42e6d1085f1557164d16036aa35180a", kill_on_drop: false }`
[INFO] [stdout] df8cce867cc4387c44837926d472ccb3f42e6d1085f1557164d16036aa35180a
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9854d953a1d2e02a628be574205d7f14c813c2385dd48498219f42792f20d20a
[INFO] running `Command { std: "docker" "start" "-a" "9854d953a1d2e02a628be574205d7f14c813c2385dd48498219f42792f20d20a", kill_on_drop: false }`
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling plotters-backend v0.3.7
[INFO] [stderr]    Compiling csv-core v0.1.12
[INFO] [stderr]    Compiling regex-automata v0.4.11
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling half v1.8.3
[INFO] [stderr]    Compiling criterion-plot v0.4.5
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling chrono v0.4.42
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling uuid v0.8.2
[INFO] [stderr]    Compiling rayon v1.11.0
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling serde_bytes v0.11.19
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling serde_cbor v0.11.2
[INFO] [stderr]    Compiling plotters-svg v0.3.7
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling csv v1.3.1
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling plotters v0.3.7
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling regex v1.11.3
[INFO] [stderr]    Compiling bson v1.2.4
[INFO] [stderr]    Compiling criterion v0.3.6
[INFO] [stderr]    Compiling serde_bson v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:61:9
[INFO] [stdout]    |
[INFO] [stdout] 61 |         to_string(&test, &mut ours);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 61 |         let _ = to_string(&test, &mut ours);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 12.14s
[INFO] running `Command { std: "docker" "inspect" "9854d953a1d2e02a628be574205d7f14c813c2385dd48498219f42792f20d20a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9854d953a1d2e02a628be574205d7f14c813c2385dd48498219f42792f20d20a", kill_on_drop: false }`
[INFO] [stdout] 9854d953a1d2e02a628be574205d7f14c813c2385dd48498219f42792f20d20a