[INFO] fetching crate rustt 0.1.2...
[INFO] testing rustt-0.1.2 against master#562dee4820c458d823175268e41601d4c060588a for pr-154210-2
[INFO] extracting crate rustt 0.1.2 into /workspace/builds/worker-1-tc1/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-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rustt 0.1.2 on toolchain 562dee4820c458d823175268e41601d4c060588a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+562dee4820c458d823175268e41601d4c060588a" "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" "+562dee4820c458d823175268e41601d4c060588a" "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" "+562dee4820c458d823175268e41601d4c060588a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded criterion-plot v0.4.5
[INFO] [stderr]   Downloaded serde_cbor v0.11.2
[INFO] [stderr]   Downloaded integer-encoding v1.1.7
[INFO] [stderr]   Downloaded criterion v0.3.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+562dee4820c458d823175268e41601d4c060588a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6790984c7e9aabf16ca17edb20ed70c5227413cd9e8498ca04b9668453240e90
[INFO] running `Command { std: "docker" "start" "-a" "6790984c7e9aabf16ca17edb20ed70c5227413cd9e8498ca04b9668453240e90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6790984c7e9aabf16ca17edb20ed70c5227413cd9e8498ca04b9668453240e90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6790984c7e9aabf16ca17edb20ed70c5227413cd9e8498ca04b9668453240e90", kill_on_drop: false }`
[INFO] [stdout] 6790984c7e9aabf16ca17edb20ed70c5227413cd9e8498ca04b9668453240e90
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "+562dee4820c458d823175268e41601d4c060588a" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ad64bd2dd68b421b1c8c68287ccd487ee6dc9712ea393e7d8b337e1f4ef8af29
[INFO] running `Command { std: "docker" "start" "-a" "ad64bd2dd68b421b1c8c68287ccd487ee6dc9712ea393e7d8b337e1f4ef8af29", kill_on_drop: false }`
[INFO] [stderr]    Compiling integer-encoding v1.1.7
[INFO] [stderr]    Compiling syn v2.0.117
[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 <https://github.com/rust-lang/rust/pull/79336> 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 <https://github.com/rust-lang/rust/issues/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 2026-03-21; 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 <https://github.com/rust-lang/rust/issues/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 2026-03-21; 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 <https://github.com/rust-lang/rust/issues/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 2026-03-21; 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 <https://github.com/rust-lang/rust/issues/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 2026-03-21; 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<u8> {}
[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/562dee4820c458d823175268e41601d4c060588a/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<u8> {}
[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/562dee4820c458d823175268e41601d4c060588a/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" "ad64bd2dd68b421b1c8c68287ccd487ee6dc9712ea393e7d8b337e1f4ef8af29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ad64bd2dd68b421b1c8c68287ccd487ee6dc9712ea393e7d8b337e1f4ef8af29", kill_on_drop: false }`
[INFO] [stdout] ad64bd2dd68b421b1c8c68287ccd487ee6dc9712ea393e7d8b337e1f4ef8af29