[INFO] fetching crate mongo_sync 0.1.0...
[INFO] testing mongo_sync-0.1.0 against beta-2025-10-28 for beta-1.92-2
[INFO] extracting crate mongo_sync 0.1.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate mongo_sync 0.1.0
[INFO] finished tweaking crates.io crate mongo_sync 0.1.0
[INFO] tweaked toml for crates.io crate mongo_sync 0.1.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mongo_sync 0.1.0 on toolchain beta-2025-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mongo_sync 0.1.0 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" "+beta-2025-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e21c96ad4ad1f23b43406a4b0dcd5718cf4e9d211521296a1481a02e90dfa51
[INFO] running `Command { std: "docker" "start" "-a" "9e21c96ad4ad1f23b43406a4b0dcd5718cf4e9d211521296a1481a02e90dfa51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e21c96ad4ad1f23b43406a4b0dcd5718cf4e9d211521296a1481a02e90dfa51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e21c96ad4ad1f23b43406a4b0dcd5718cf4e9d211521296a1481a02e90dfa51", kill_on_drop: false }`
[INFO] [stdout] 9e21c96ad4ad1f23b43406a4b0dcd5718cf4e9d211521296a1481a02e90dfa51
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5337e387f039c989623b527608aa3b53d73210f78cb13c275a4e2f1455b24a1b
[INFO] running `Command { std: "docker" "start" "-a" "5337e387f039c989623b527608aa3b53d73210f78cb13c275a4e2f1455b24a1b", kill_on_drop: false }`
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[INFO] [stderr]    Compiling tracing-appender v0.1.2
[INFO] [stderr]    Compiling mongo_sync v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0407]: method `backtrace` is not a member of trait `std::error::Error`
[INFO] [stdout]   --> src/error.rs:11:10
[INFO] [stdout]    |
[INFO] [stdout] 11 | #[derive(Error, Debug)]
[INFO] [stdout]    |          ^^^^^ not a member of trait `std::error::Error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:32:1
[INFO] [stdout]    |
[INFO] [stdout] 32 | #![feature(backtrace)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `backtrace` has been stable since 1.65.0 and no longer requires an attribute to enable
[INFO] [stdout]   --> src/lib.rs:32:12
[INFO] [stdout]    |
[INFO] [stdout] 32 | #![feature(backtrace)]
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `backtrace` found for reference `&dyn std::error::Error` in the current scope
[INFO] [stdout]   --> src/error.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         source: MongoError,
[INFO] [stdout]    |         ^^^^^^ method not found in `&dyn std::error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `backtrace` found for reference `&dyn std::error::Error` in the current scope
[INFO] [stdout]   --> src/error.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         source: ValueAccessError,
[INFO] [stdout]    |         ^^^^^^ method not found in `&dyn std::error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `backtrace` found for reference `&dyn std::error::Error` in the current scope
[INFO] [stdout]   --> src/error.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         source: RecvError,
[INFO] [stdout]    |         ^^^^^^ method not found in `&dyn std::error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> src/error.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         source: MongoError,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `backtrace` is never read
[INFO] [stdout]   --> src/error.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |         backtrace: Backtrace,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> src/error.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |         source: ValueAccessError,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `backtrace` is never read
[INFO] [stdout]   --> src/error.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         backtrace: Backtrace,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `source` is never read
[INFO] [stdout]   --> src/error.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         source: RecvError,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `backtrace` is never read
[INFO] [stdout]   --> src/error.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |         backtrace: Backtrace,
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0407, E0554, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0407`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mongo_sync` (lib) due to 5 previous errors; 7 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "5337e387f039c989623b527608aa3b53d73210f78cb13c275a4e2f1455b24a1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5337e387f039c989623b527608aa3b53d73210f78cb13c275a4e2f1455b24a1b", kill_on_drop: false }`
[INFO] [stdout] 5337e387f039c989623b527608aa3b53d73210f78cb13c275a4e2f1455b24a1b
