[INFO] fetching crate rustt 0.1.2... [INFO] testing rustt-0.1.2 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-2 [INFO] extracting crate rustt 0.1.2 into /workspace/builds/worker-1-tc2/source [INFO] started tweaking crates.io crate rustt 0.1.2 [INFO] finished tweaking crates.io crate rustt 0.1.2 [INFO] tweaked toml for crates.io crate rustt 0.1.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate rustt 0.1.2 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 65 packages to latest compatible versions [INFO] [stderr] Adding criterion v0.3.6 (available: v0.8.2) [INFO] [stderr] Adding integer-encoding v1.1.7 (available: v4.1.0) [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 92475130829c40a969bb3e5e8bfeb0b476a8013c98fc735942d8f86c3f889dbc [INFO] running `Command { std: "docker" "start" "-a" "92475130829c40a969bb3e5e8bfeb0b476a8013c98fc735942d8f86c3f889dbc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "92475130829c40a969bb3e5e8bfeb0b476a8013c98fc735942d8f86c3f889dbc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "92475130829c40a969bb3e5e8bfeb0b476a8013c98fc735942d8f86c3f889dbc", kill_on_drop: false }` [INFO] [stdout] 92475130829c40a969bb3e5e8bfeb0b476a8013c98fc735942d8f86c3f889dbc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] bf4a332ef32d0f964edaa6af073a03c1121ecd997023253cdb6c89b269353a5f [INFO] running `Command { std: "docker" "start" "-a" "bf4a332ef32d0f964edaa6af073a03c1121ecd997023253cdb6c89b269353a5f", kill_on_drop: false }` [INFO] [stderr] Compiling syn v2.0.117 [INFO] [stderr] Compiling integer-encoding v1.1.7 [INFO] [stderr] Compiling serde_derive v1.0.228 [INFO] [stderr] Compiling serde v1.0.228 [INFO] [stderr] Compiling rustt v0.1.2 (/opt/rustwide/workdir) [INFO] [stdout] error[E0557]: feature has been removed [INFO] [stdout] --> src/lib.rs:79:12 [INFO] [stdout] | [INFO] [stdout] 79 | #![feature(optin_builtin_traits)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^ feature has been removed [INFO] [stdout] | [INFO] [stdout] = note: removed in 1.50.0; see for more information [INFO] [stdout] = note: renamed to `auto_traits` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: auto traits are experimental and possibly buggy [INFO] [stdout] --> src/ttv3/serde/mod.rs:12:1 [INFO] [stdout] | [INFO] [stdout] 12 | pub auto trait IsNotU8 {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #13231 for more information [INFO] [stdout] = help: add `#![feature(auto_traits)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-22; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: auto traits are experimental and possibly buggy [INFO] [stdout] --> src/ttv3/serde/mod.rs:16:1 [INFO] [stdout] | [INFO] [stdout] 16 | pub auto trait IsNotVU8 {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #13231 for more information [INFO] [stdout] = help: add `#![feature(auto_traits)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-22; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: auto traits are experimental and possibly buggy [INFO] [stdout] --> src/ttv3/serde/mod.rs:19:1 [INFO] [stdout] | [INFO] [stdout] 19 | pub auto trait IsNotCustom {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #13231 for more information [INFO] [stdout] = help: add `#![feature(auto_traits)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-22; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: auto traits are experimental and possibly buggy [INFO] [stdout] --> src/ttv3/serde/mod.rs:22:1 [INFO] [stdout] | [INFO] [stdout] 22 | pub auto trait NotImplementKey {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #13231 for more information [INFO] [stdout] = help: add `#![feature(auto_traits)]` to the crate attributes to enable [INFO] [stdout] = note: this compiler was built on 2026-03-22; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0366]: `!IsNotVU8` impls cannot be specialized [INFO] [stdout] --> src/ttv3/serde/mod.rs:17:1 [INFO] [stdout] | [INFO] [stdout] 17 | impl !IsNotVU8 for Vec {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `u8` is not a generic parameter [INFO] [stdout] note: use the same sequence of generic lifetime, type and const parameters as the struct definition [INFO] [stdout] --> /rustc/dec9417b8611e34e787a3e4c37686b5131f9e5c5/library/alloc/src/vec/mod.rs:438:0 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0366]: `!NotImplementKey` impls cannot be specialized [INFO] [stdout] --> src/ttv3/serde/mod.rs:26:1 [INFO] [stdout] | [INFO] [stdout] 26 | impl !NotImplementKey for Vec {} [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `u8` is not a generic parameter [INFO] [stdout] note: use the same sequence of generic lifetime, type and const parameters as the struct definition [INFO] [stdout] --> /rustc/dec9417b8611e34e787a3e4c37686b5131f9e5c5/library/alloc/src/vec/mod.rs:438:0 [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] Some errors have detailed explanations: E0366, E0557, E0658. [INFO] [stdout] [INFO] [stdout] For more information about an error, try `rustc --explain E0366`. [INFO] [stdout] [INFO] [stderr] error: could not compile `rustt` (lib) due to 7 previous errors [INFO] running `Command { std: "docker" "inspect" "bf4a332ef32d0f964edaa6af073a03c1121ecd997023253cdb6c89b269353a5f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "bf4a332ef32d0f964edaa6af073a03c1121ecd997023253cdb6c89b269353a5f", kill_on_drop: false }` [INFO] [stdout] bf4a332ef32d0f964edaa6af073a03c1121ecd997023253cdb6c89b269353a5f