[INFO] fetching crate serde_fast_flatten_derive 0.1.3...
[INFO] testing serde_fast_flatten_derive-0.1.3 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate serde_fast_flatten_derive 0.1.3 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate serde_fast_flatten_derive 0.1.3
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate serde_fast_flatten_derive 0.1.3
[INFO] tweaked toml for crates.io crate serde_fast_flatten_derive 0.1.3 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate serde_fast_flatten_derive 0.1.3 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate serde_fast_flatten_derive 0.1.3 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-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e8a0979787477998fd8f69fe033bb7fc27700259bef421c5aa8a2f467b6b25d9
[INFO] running `Command { std: "docker" "start" "-a" "e8a0979787477998fd8f69fe033bb7fc27700259bef421c5aa8a2f467b6b25d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e8a0979787477998fd8f69fe033bb7fc27700259bef421c5aa8a2f467b6b25d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8a0979787477998fd8f69fe033bb7fc27700259bef421c5aa8a2f467b6b25d9", kill_on_drop: false }`
[INFO] [stdout] e8a0979787477998fd8f69fe033bb7fc27700259bef421c5aa8a2f467b6b25d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26db90b4cf12d288212d41b46a862696a6f9b1a0f63d36a83c5ec622e0a7302f
[INFO] running `Command { std: "docker" "start" "-a" "26db90b4cf12d288212d41b46a862696a6f9b1a0f63d36a83c5ec622e0a7302f", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v2.0.98
[INFO] [stderr]    Compiling serde_derive_internals v0.29.1
[INFO] [stderr]    Compiling serde_fast_flatten_derive v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.47s
[INFO] running `Command { std: "docker" "inspect" "26db90b4cf12d288212d41b46a862696a6f9b1a0f63d36a83c5ec622e0a7302f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26db90b4cf12d288212d41b46a862696a6f9b1a0f63d36a83c5ec622e0a7302f", kill_on_drop: false }`
[INFO] [stdout] 26db90b4cf12d288212d41b46a862696a6f9b1a0f63d36a83c5ec622e0a7302f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 889b61ad42051ca3c51483ecb54cdf8593fad97706ae9ffce4f36a3da235b215
[INFO] running `Command { std: "docker" "start" "-a" "889b61ad42051ca3c51483ecb54cdf8593fad97706ae9ffce4f36a3da235b215", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.93
[INFO] [stderr]    Compiling unicode-ident v1.0.16
[INFO] [stderr]    Compiling serde v1.0.217
[INFO] [stderr]    Compiling hashbrown v0.15.2
[INFO] [stderr]    Compiling serde_json v1.0.138
[INFO] [stderr]    Compiling once_cell v1.20.3
[INFO] [stderr]    Compiling linked-hash-map v0.5.6
[INFO] [stderr]    Compiling half v1.8.3
[INFO] [stderr]    Compiling bytemuck v1.21.0
[INFO] [stderr]    Compiling console v0.15.10
[INFO] [stderr]    Compiling quote v1.0.38
[INFO] [stderr]    Compiling indexmap v2.7.1
[INFO] [stderr]    Compiling syn v2.0.98
[INFO] [stderr]    Compiling serde_derive_internals v0.29.1
[INFO] [stderr]    Compiling serde_derive v1.0.217
[INFO] [stderr]    Compiling pin-project-internal v1.1.9
[INFO] [stderr]    Compiling bitcode_derive v0.6.4
[INFO] [stderr]    Compiling serde_fast_flatten_derive v0.1.2
[INFO] [stderr]    Compiling serde_fast_flatten_derive v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling pin-project v1.1.9
[INFO] [stderr]    Compiling insta v1.42.1
[INFO] [stderr]    Compiling serde_cbor v0.11.2
[INFO] [stderr]    Compiling serde_fast_flatten v0.1.2
[INFO] [stderr]    Compiling bitcode v0.6.4
[INFO] [stderr]    Compiling bincode v1.3.3
[INFO] [stderr]    Compiling serde_yaml v0.9.34+deprecated
[INFO] [stdout] error[E0425]: cannot find type `U` in this scope
[INFO] [stdout]  --> tests/generics.rs:8:24
[INFO] [stdout]   |
[INFO] [stdout] 8 |     params: PageParams<U>,
[INFO] [stdout]   |                        ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find type `T` in this scope
[INFO] [stdout]  --> tests/generics.rs:6:16
[INFO] [stdout]   |
[INFO] [stdout] 6 |     items: Vec<T>,
[INFO] [stdout]   |                ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find type `T` in this scope
[INFO] [stdout]   --> tests/generics.rs:13:12
[INFO] [stdout]    |
[INFO] [stdout] 13 |     start: T,
[INFO] [stdout]    |            ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find type `T` in this scope
[INFO] [stdout]   --> tests/generics.rs:14:12
[INFO] [stdout]    |
[INFO] [stdout] 14 |     limit: T,
[INFO] [stdout]    |            ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: missing generics for struct `Paged`
[INFO] [stdout]  --> tests/generics.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Paged<T, U> {
[INFO] [stdout]   |        ^^^^^ expected 2 generic arguments
[INFO] [stdout]   |
[INFO] [stdout] note: struct defined here, with 2 generic parameters: `T`, `U`
[INFO] [stdout]  --> tests/generics.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Paged<T, U> {
[INFO] [stdout]   |        ^^^^^ -  -
[INFO] [stdout] help: add missing generic arguments
[INFO] [stdout]   |
[INFO] [stdout] 5 | struct Paged<T, U><T, U> {
[INFO] [stdout]   |             ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0107]: missing generics for struct `PageParams`
[INFO] [stdout]   --> tests/generics.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct PageParams<T> {
[INFO] [stdout]    |        ^^^^^^^^^^ expected 1 generic argument
[INFO] [stdout]    |
[INFO] [stdout] note: struct defined here, with 1 generic parameter: `T`
[INFO] [stdout]   --> tests/generics.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct PageParams<T> {
[INFO] [stdout]    |        ^^^^^^^^^^ -
[INFO] [stdout] help: add missing generic argument
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct PageParams<T><T> {
[INFO] [stdout]    |                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0107, E0425.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0107`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `serde_fast_flatten_derive` (test "generics") due to 6 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "889b61ad42051ca3c51483ecb54cdf8593fad97706ae9ffce4f36a3da235b215", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "889b61ad42051ca3c51483ecb54cdf8593fad97706ae9ffce4f36a3da235b215", kill_on_drop: false }`
[INFO] [stdout] 889b61ad42051ca3c51483ecb54cdf8593fad97706ae9ffce4f36a3da235b215
