[INFO] fetching crate sexpr 0.1.0...
[INFO] testing sexpr-0.1.0 against master#ec6f9a5b4413f74386267ef8efc93712c2ce6db6 for pr-155739-1
[INFO] extracting crate sexpr 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate sexpr 0.1.0
[INFO] finished tweaking crates.io crate sexpr 0.1.0
[INFO] tweaked toml for crates.io crate sexpr 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate sexpr 0.1.0 on toolchain ec6f9a5b4413f74386267ef8efc93712c2ce6db6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 6 packages to latest compatible versions
[INFO] [stderr]       Adding gc v0.2.1 (available: v0.5.1)
[INFO] [stderr]       Adding gc_derive v0.2.0 (available: v0.2.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gc_derive v0.2.0
[INFO] [stderr]   Downloaded synstructure v0.2.1
[INFO] [stderr]   Downloaded unicode-xid v0.0.3
[INFO] [stderr]   Downloaded gc v0.2.1
[INFO] [stderr]   Downloaded syn v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a064ed349495b1640afb33bbe0a2a30f0c2aebae4af45c75573530cfd3bbeaaa
[INFO] running `Command { std: "docker" "start" "-a" "a064ed349495b1640afb33bbe0a2a30f0c2aebae4af45c75573530cfd3bbeaaa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a064ed349495b1640afb33bbe0a2a30f0c2aebae4af45c75573530cfd3bbeaaa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a064ed349495b1640afb33bbe0a2a30f0c2aebae4af45c75573530cfd3bbeaaa", kill_on_drop: false }`
[INFO] [stdout] a064ed349495b1640afb33bbe0a2a30f0c2aebae4af45c75573530cfd3bbeaaa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8af84915eb4f50b91eeffb1ab5e93630a86c3071183f1009f688f92310696a7d
[INFO] running `Command { std: "docker" "start" "-a" "8af84915eb4f50b91eeffb1ab5e93630a86c3071183f1009f688f92310696a7d", kill_on_drop: false }`
[INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling unicode-xid v0.0.3
[INFO] [stderr]    Compiling gc v0.2.1
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:7:54
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(coerce_unsized, core_intrinsics, nonzero, optin_builtin_traits, shared, unsize, specialization)]
[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[E0432]: unresolved import `core::nonzero`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:11:11
[INFO] [stdout]    |
[INFO] [stdout] 11 | use core::nonzero::NonZero;
[INFO] [stdout]    |           ^^^^^^^ could not find `nonzero` in `core`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::ptr::Shared`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/gc.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::ptr::Shared;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^ no `Shared` in `ptr`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative impls are experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 | impl<T: ?Sized> !Send for Gc<T> {}
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]    = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]    = help: use marker types for now
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative impls are experimental
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:43:17
[INFO] [stdout]    |
[INFO] [stdout] 43 | impl<T: ?Sized> !Sync for Gc<T> {}
[INFO] [stdout]    |                 ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]    = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]    = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]    = help: use marker types for now
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: negative impls are experimental
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:541:17
[INFO] [stdout]     |
[INFO] [stdout] 541 | impl<T: ?Sized> !Sync for GcCell<T> {}
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #68318 <https://github.com/rust-lang/rust/issues/68318> for more information
[INFO] [stdout]     = help: add `#![feature(negative_impls)]` to the crate attributes to enable
[INFO] [stdout]     = note: this compiler was built on 2026-04-24; consider upgrading it if it is out of date
[INFO] [stdout]     = help: use marker types for now
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `shared`
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:7:76
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(coerce_unsized, core_intrinsics, nonzero, optin_builtin_traits, shared, unsize, specialization)]
[INFO] [stdout]   |                                                                            ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout] help: there is a feature with a similar name: `sealed`
[INFO] [stdout]   |
[INFO] [stdout] 7 - #![feature(coerce_unsized, core_intrinsics, nonzero, optin_builtin_traits, shared, unsize, specialization)]
[INFO] [stdout] 7 + #![feature(coerce_unsized, core_intrinsics, nonzero, optin_builtin_traits, sealed, unsize, specialization)]
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0374]: implementing `CoerceUnsized` requires a field to be coerced
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/gc-0.2.1/src/lib.rs:45:1
[INFO] [stdout]    |
[INFO] [stdout] 45 | impl<T: Trace + ?Sized + marker::Unsize<U>, U: Trace + ?Sized> CoerceUnsized<Gc<U>> for Gc<T> {}
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected a single field to be coerced, none found
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling syn v0.9.2
[INFO] [stdout] Some errors have detailed explanations: E0374, E0432, E0557, E0635, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0374`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `gc` (lib) due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "8af84915eb4f50b91eeffb1ab5e93630a86c3071183f1009f688f92310696a7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8af84915eb4f50b91eeffb1ab5e93630a86c3071183f1009f688f92310696a7d", kill_on_drop: false }`
[INFO] [stdout] 8af84915eb4f50b91eeffb1ab5e93630a86c3071183f1009f688f92310696a7d
