[INFO] fetching crate enumset_derive 0.8.1...
[INFO] checking enumset_derive-0.8.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate enumset_derive 0.8.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate enumset_derive 0.8.1 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enumset_derive 0.8.1
[INFO] finished tweaking crates.io crate enumset_derive 0.8.1
[INFO] tweaked toml for crates.io crate enumset_derive 0.8.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 19 packages
[INFO] [stderr]       Adding proc-macro-crate v1.3.1 (latest: v3.1.0)
[INFO] [stderr]       Adding toml_edit v0.19.15 (latest: v0.22.9)
[INFO] [stderr]       Adding winnow v0.5.40 (latest: v0.6.5)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 072d26fe058d0f56b2f4d7970e6fd7d1cfa3d1c50a8306a6944ee09803364149
[INFO] running `Command { std: "docker" "start" "-a" "072d26fe058d0f56b2f4d7970e6fd7d1cfa3d1c50a8306a6944ee09803364149", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "072d26fe058d0f56b2f4d7970e6fd7d1cfa3d1c50a8306a6944ee09803364149", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "072d26fe058d0f56b2f4d7970e6fd7d1cfa3d1c50a8306a6944ee09803364149", kill_on_drop: false }`
[INFO] [stdout] 072d26fe058d0f56b2f4d7970e6fd7d1cfa3d1c50a8306a6944ee09803364149
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0bd6eff4351d3629dcd3cd52e63122919796d1b67c7de8da9937ce325046424
[INFO] running `Command { std: "docker" "start" "-a" "d0bd6eff4351d3629dcd3cd52e63122919796d1b67c7de8da9937ce325046424", kill_on_drop: false }`
[INFO] [stderr]     Checking syn v2.0.58
[INFO] [stderr]    Compiling darling_core v0.20.8
[INFO] [stderr]    Compiling darling_macro v0.20.8
[INFO] [stderr]     Checking darling v0.20.8
[INFO] [stderr]     Checking enumset_derive v0.8.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.62s
[INFO] running `Command { std: "docker" "inspect" "d0bd6eff4351d3629dcd3cd52e63122919796d1b67c7de8da9937ce325046424", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0bd6eff4351d3629dcd3cd52e63122919796d1b67c7de8da9937ce325046424", kill_on_drop: false }`
[INFO] [stdout] d0bd6eff4351d3629dcd3cd52e63122919796d1b67c7de8da9937ce325046424
[INFO] checking enumset_derive-0.8.1 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate enumset_derive 0.8.1 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate enumset_derive 0.8.1 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enumset_derive 0.8.1
[INFO] finished tweaking crates.io crate enumset_derive 0.8.1
[INFO] tweaked toml for crates.io crate enumset_derive 0.8.1 written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 516d3f2f930700b9c4a6bf25522a06a41c541d106ad7068d2e956db15090afa6
[INFO] running `Command { std: "docker" "start" "-a" "516d3f2f930700b9c4a6bf25522a06a41c541d106ad7068d2e956db15090afa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "516d3f2f930700b9c4a6bf25522a06a41c541d106ad7068d2e956db15090afa6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "516d3f2f930700b9c4a6bf25522a06a41c541d106ad7068d2e956db15090afa6", kill_on_drop: false }`
[INFO] [stdout] 516d3f2f930700b9c4a6bf25522a06a41c541d106ad7068d2e956db15090afa6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 082388f29a3e444b662dd4ddebdecac6028ef412935e18e006aab7eb837d058f
[INFO] running `Command { std: "docker" "start" "-a" "082388f29a3e444b662dd4ddebdecac6028ef412935e18e006aab7eb837d058f", kill_on_drop: false }`
[INFO] [stderr]     Checking syn v2.0.58
[INFO] [stderr]    Compiling darling_core v0.20.8
[INFO] [stderr]    Compiling darling_macro v0.20.8
[INFO] [stderr]     Checking darling v0.20.8
[INFO] [stderr]     Checking enumset_derive v0.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/lib.rs:212:21
[INFO] [stdout]     |
[INFO] [stdout] 212 |                     error(expr.span(), "Enum discriminants must not be negative.")?;
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `T` declared on the function `error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/lib.rs:283:13
[INFO] [stdout]     |
[INFO] [stdout] 283 | /             error(
[INFO] [stdout] 284 | |                 largest_discriminant_span,
[INFO] [stdout] 285 | |                 "`repr` is too small to contain the largest discriminant.",
[INFO] [stdout] 286 | |             )?;
[INFO] [stdout]     | |_____________^ cannot infer type for type parameter `T` declared on the function `error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/lib.rs:212:21
[INFO] [stdout]     |
[INFO] [stdout] 212 |                     error(expr.span(), "Enum discriminants must not be negative.")?;
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `T` declared on the function `error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> src/lib.rs:283:13
[INFO] [stdout]     |
[INFO] [stdout] 283 | /             error(
[INFO] [stdout] 284 | |                 largest_discriminant_span,
[INFO] [stdout] 285 | |                 "`repr` is too small to contain the largest discriminant.",
[INFO] [stdout] 286 | |             )?;
[INFO] [stdout]     | |_____________^ cannot infer type for type parameter `T` declared on the function `error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `enumset_derive` (lib test) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `enumset_derive` (lib) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "082388f29a3e444b662dd4ddebdecac6028ef412935e18e006aab7eb837d058f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "082388f29a3e444b662dd4ddebdecac6028ef412935e18e006aab7eb837d058f", kill_on_drop: false }`
[INFO] [stdout] 082388f29a3e444b662dd4ddebdecac6028ef412935e18e006aab7eb837d058f