[INFO] fetching crate sexpr 0.1.0... [INFO] testing sexpr-0.1.0 against master#562dee4820c458d823175268e41601d4c060588a for pr-154210-2 [INFO] extracting crate sexpr 0.1.0 into /workspace/builds/worker-0-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-0-tc1/source/Cargo.toml [INFO] validating manifest of crates.io crate sexpr 0.1.0 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 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" "+562dee4820c458d823175268e41601d4c060588a" "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 unicode-xid v0.0.3 [INFO] [stderr] Downloaded syn v0.9.2 [INFO] [stderr] Downloaded gc_derive v0.2.0 [INFO] [stderr] Downloaded synstructure v0.2.1 [INFO] [stderr] Downloaded gc v0.2.1 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 8086d4811d1b9488b15c17e6944384baa21b1dd1dc78da1d8733840e30fe9c50 [INFO] running `Command { std: "docker" "start" "-a" "8086d4811d1b9488b15c17e6944384baa21b1dd1dc78da1d8733840e30fe9c50", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "8086d4811d1b9488b15c17e6944384baa21b1dd1dc78da1d8733840e30fe9c50", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8086d4811d1b9488b15c17e6944384baa21b1dd1dc78da1d8733840e30fe9c50", kill_on_drop: false }` [INFO] [stdout] 8086d4811d1b9488b15c17e6944384baa21b1dd1dc78da1d8733840e30fe9c50 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 31cc9b14ae018505dc0af18347bf255e9e2b7a924a346e408b20edb03be55e7a [INFO] running `Command { std: "docker" "start" "-a" "31cc9b14ae018505dc0af18347bf255e9e2b7a924a346e408b20edb03be55e7a", kill_on_drop: false }` [INFO] [stderr] warning: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024` [INFO] [stderr] Compiling unicode-xid v0.0.3 [INFO] [stderr] Compiling quote v0.3.15 [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 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 trait bounds are not fully implemented; use marker types for now [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 !Send for Gc {} [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #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 2026-03-21; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: negative trait bounds are not fully implemented; use marker types for now [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 !Sync for Gc {} [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #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 2026-03-21; consider upgrading it if it is out of date [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error[E0658]: negative trait bounds are not fully implemented; use marker types for now [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 !Sync for GcCell {} [INFO] [stdout] | ^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: see issue #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 2026-03-21; consider upgrading it if it is out of date [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, U: Trace + ?Sized> CoerceUnsized> for Gc {} [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" "31cc9b14ae018505dc0af18347bf255e9e2b7a924a346e408b20edb03be55e7a", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "31cc9b14ae018505dc0af18347bf255e9e2b7a924a346e408b20edb03be55e7a", kill_on_drop: false }` [INFO] [stdout] 31cc9b14ae018505dc0af18347bf255e9e2b7a924a346e408b20edb03be55e7a