[INFO] crate free_macros 0.0.1 is already in cache
[INFO] testing free_macros-0.0.1 against 1.44.0 for beta-1.45-1
[INFO] extracting crate free_macros 0.0.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate free_macros 0.0.1 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 free_macros 0.0.1
[INFO] finished tweaking crates.io crate free_macros 0.0.1
[INFO] tweaked toml for crates.io crate free_macros 0.0.1 written to /workspace/builds/worker-5/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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] dca43b2a7bf0590770dc8b8048996d44e6376c973a08083f152e08066714a1af
[INFO] running `"docker" "start" "-a" "dca43b2a7bf0590770dc8b8048996d44e6376c973a08083f152e08066714a1af"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling free_macros v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]  --> src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: see issue #54726 <https://github.com/rust-lang/rust/issues/54726> for more information
[INFO] [stderr] 
[INFO] [stderr] error: macros that expand to items must be delimited with braces or followed by a semicolon
[INFO] [stderr]    --> src/free/monad.rs:2:19
[INFO] [stderr]     |
[INFO] [stderr] 2   |   macro_rules! monad(
[INFO] [stderr]     |  ___________________^
[INFO] [stderr] 3   | |     ($M:ident, $Sig:ident, $sig_map:ident, [ $($ctx:ident,)* ]) =>
[INFO] [stderr] 4   | |     {
[INFO] [stderr] 5   | |
[INFO] [stderr] ...   |
[INFO] [stderr] 256 | |     };
[INFO] [stderr] 257 | | )
[INFO] [stderr]     | |_^
[INFO] [stderr]     |
[INFO] [stderr] help: change the delimiters to curly braces
[INFO] [stderr]     |
[INFO] [stderr] 2   | macro_rules! monad{
[INFO] [stderr] 3   |     ($M:ident, $Sig:ident, $sig_map:ident, [ $($ctx:ident,)* ]) =>
[INFO] [stderr] 4   |     {
[INFO] [stderr] 5   | 
[INFO] [stderr] 6   |         #[allow(dead_code)]
[INFO] [stderr] 7   |         struct Opaque(*const u8);
[INFO] [stderr]   ...
[INFO] [stderr] help: add a semicolon
[INFO] [stderr]     |
[INFO] [stderr] 257 | );
[INFO] [stderr]     |  ^
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute `license` in this scope
[INFO] [stderr]  --> src/lib.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | #![feature(macro_rules)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![feature(unboxed_closures)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 5 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0658.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `free_macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dca43b2a7bf0590770dc8b8048996d44e6376c973a08083f152e08066714a1af"`
[INFO] running `"docker" "rm" "-f" "dca43b2a7bf0590770dc8b8048996d44e6376c973a08083f152e08066714a1af"`
[INFO] [stdout] dca43b2a7bf0590770dc8b8048996d44e6376c973a08083f152e08066714a1af