[INFO] fetching crate json_proc 0.5.1...
[INFO] testing json_proc-0.5.1 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate json_proc 0.5.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate json_proc 0.5.1
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate json_proc 0.5.1
[INFO] tweaked toml for crates.io crate json_proc 0.5.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate json_proc 0.5.1 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate json_proc 0.5.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a62602a9b2867daa0daf5812c60f57aaadc26d2a243614cec1ec705262f7296
[INFO] running `Command { std: "docker" "start" "-a" "4a62602a9b2867daa0daf5812c60f57aaadc26d2a243614cec1ec705262f7296", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a62602a9b2867daa0daf5812c60f57aaadc26d2a243614cec1ec705262f7296", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a62602a9b2867daa0daf5812c60f57aaadc26d2a243614cec1ec705262f7296", kill_on_drop: false }`
[INFO] [stdout] 4a62602a9b2867daa0daf5812c60f57aaadc26d2a243614cec1ec705262f7296
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 476b9d79b9d02f6f0d0a40cd0b54e9de801c9f023adcc6ea6208b17ffd22cd89
[INFO] running `Command { std: "docker" "start" "-a" "476b9d79b9d02f6f0d0a40cd0b54e9de801c9f023adcc6ea6208b17ffd22cd89", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.23
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.86
[INFO] [stderr]    Compiling json_proc_macro v0.5.1
[INFO] [stderr]    Compiling json_proc v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Diagnostic`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/json_proc_macro-0.5.1/src/lib.rs:179:21
[INFO] [stdout]     |
[INFO] [stdout] 179 |         let mut d = Diagnostic::spanned(
[INFO] [stdout]     |                     ^^^^^^^^^^ use of undeclared type `Diagnostic`
[INFO] [stdout]     |
[INFO] [stdout] note: found an item that was configured out
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/json_proc_macro-0.5.1/src/lib.rs:17:18
[INFO] [stdout]     |
[INFO] [stdout]  15 | #[cfg(lints_enabled)]
[INFO] [stdout]     |       ------------- the item is gated here
[INFO] [stdout]  16 | // These only work on nightly because they are unstable
[INFO] [stdout]  17 | use proc_macro::{Diagnostic, Level};
[INFO] [stdout]     |                  ^^^^^^^^^^
[INFO] [stdout] help: a tool attribute with a similar name exists
[INFO] [stdout]     |
[INFO] [stdout] 179 -         let mut d = Diagnostic::spanned(
[INFO] [stdout] 179 +         let mut d = diagnostic::spanned(
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing this struct
[INFO] [stdout]     |
[INFO] [stdout]   3 + use proc_macro::Diagnostic;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `Level`
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/json_proc_macro-0.5.1/src/lib.rs:181:13
[INFO] [stdout]     |
[INFO] [stdout] 181 |             Level::Note,
[INFO] [stdout]     |             ^^^^^ use of undeclared type `Level`
[INFO] [stdout]     |
[INFO] [stdout] note: found an item that was configured out
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/json_proc_macro-0.5.1/src/lib.rs:17:30
[INFO] [stdout]     |
[INFO] [stdout]  15 | #[cfg(lints_enabled)]
[INFO] [stdout]     |       ------------- the item is gated here
[INFO] [stdout]  16 | // These only work on nightly because they are unstable
[INFO] [stdout]  17 | use proc_macro::{Diagnostic, Level};
[INFO] [stdout]     |                              ^^^^^
[INFO] [stdout] help: consider importing this enum
[INFO] [stdout]     |
[INFO] [stdout]   3 + use proc_macro::Level;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json_proc_macro` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "476b9d79b9d02f6f0d0a40cd0b54e9de801c9f023adcc6ea6208b17ffd22cd89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "476b9d79b9d02f6f0d0a40cd0b54e9de801c9f023adcc6ea6208b17ffd22cd89", kill_on_drop: false }`
[INFO] [stdout] 476b9d79b9d02f6f0d0a40cd0b54e9de801c9f023adcc6ea6208b17ffd22cd89