[INFO] fetching crate fcplug-macros 0.2.4...
[INFO] checking fcplug-macros-0.2.4 against 1.95.0 for pr-155915
[INFO] extracting crate fcplug-macros 0.2.4 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate fcplug-macros 0.2.4
[INFO] finished tweaking crates.io crate fcplug-macros 0.2.4
[INFO] tweaked toml for crates.io crate fcplug-macros 0.2.4 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate fcplug-macros 0.2.4 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "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" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 4 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (available: v2.0.117)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ac976de10734a17c0666d42a81a3031f77aadfc62795b21a8313f9bc584818cc
[INFO] running `Command { std: "docker" "start" "-a" "ac976de10734a17c0666d42a81a3031f77aadfc62795b21a8313f9bc584818cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ac976de10734a17c0666d42a81a3031f77aadfc62795b21a8313f9bc584818cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac976de10734a17c0666d42a81a3031f77aadfc62795b21a8313f9bc584818cc", kill_on_drop: false }`
[INFO] [stdout] ac976de10734a17c0666d42a81a3031f77aadfc62795b21a8313f9bc584818cc
[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" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e593e887bb0799039f62ff0d752df614772e2af6c51921dbe99af679a8c6623f
[INFO] running `Command { std: "docker" "start" "-a" "e593e887bb0799039f62ff0d752df614772e2af6c51921dbe99af679a8c6623f", kill_on_drop: false }`
[INFO] [stderr]     Checking syn v1.0.109
[INFO] [stderr]     Checking fcplug-macros v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fcplug-macros` (lib test) due to 1 previous error; 4 warnings emitted
[INFO] [stdout] warning: unused import: `proc_macro::TokenStream`
[INFO] [stdout]  --> src/lib.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use proc_macro::TokenStream;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused imports: `Ident` and `Span`
[INFO] [stdout]  --> src/lib.rs:5:19
[INFO] [stdout]   |
[INFO] [stdout] 5 | use proc_macro2::{Ident, Span};
[INFO] [stdout]   |                   ^^^^^  ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `quote::quote`
[INFO] [stdout]  --> src/lib.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use quote::quote;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `ItemFn`, `ReturnType`, `TypePath`, `TypeTuple`, and `Type`
[INFO] [stdout]  --> src/lib.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 | use syn::{ItemFn, ReturnType, Type, TypePath, TypeTuple};
[INFO] [stdout]   |           ^^^^^^  ^^^^^^^^^^  ^^^^  ^^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(box_patterns)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fcplug-macros` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "e593e887bb0799039f62ff0d752df614772e2af6c51921dbe99af679a8c6623f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e593e887bb0799039f62ff0d752df614772e2af6c51921dbe99af679a8c6623f", kill_on_drop: false }`
[INFO] [stdout] e593e887bb0799039f62ff0d752df614772e2af6c51921dbe99af679a8c6623f
