[INFO] fetching crate wasm-rpc-macros 0.2.14...
[INFO] testing wasm-rpc-macros-0.2.14 against 1.44.0 for beta-1.45-1
[INFO] extracting crate wasm-rpc-macros 0.2.14 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate wasm-rpc-macros 0.2.14 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate wasm-rpc-macros 0.2.14
[INFO] finished tweaking crates.io crate wasm-rpc-macros 0.2.14
[INFO] tweaked toml for crates.io crate wasm-rpc-macros 0.2.14 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] c558f1d9fed1a475d3e7fd52328a17368a400d0b1ccb60c052d77c78fbf7e63f
[INFO] running `"docker" "start" "-a" "c558f1d9fed1a475d3e7fd52328a17368a400d0b1ccb60c052d77c78fbf7e63f"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling wasm-rpc-macros v0.2.14 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / #![feature(
[INFO] [stderr] 2 | |     type_ascription,
[INFO] [stderr] 3 | |     box_patterns,
[INFO] [stderr] 4 | |     proc_macro_quote,
[INFO] [stderr] 5 | |     rustc_private,
[INFO] [stderr] 6 | |     proc_macro_hygiene
[INFO] [stderr] 7 | | )]
[INFO] [stderr]   | |__^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `wasm-rpc-macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "c558f1d9fed1a475d3e7fd52328a17368a400d0b1ccb60c052d77c78fbf7e63f"`
[INFO] running `"docker" "rm" "-f" "c558f1d9fed1a475d3e7fd52328a17368a400d0b1ccb60c052d77c78fbf7e63f"`
[INFO] [stdout] c558f1d9fed1a475d3e7fd52328a17368a400d0b1ccb60c052d77c78fbf7e63f