[INFO] fetching crate free 0.0.1...
[INFO] checking free-0.0.1 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate free 0.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate free 0.0.1 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate free 0.0.1
[INFO] removed path dependency free_macros from crates.io crate free 0.0.1
[INFO] finished tweaking crates.io crate free 0.0.1
[INFO] tweaked toml for crates.io crate free 0.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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=forbid" "-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" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] a0b219397f3943bfb066f61e1da1dc22ce9c4802bde58c18d542060c3779dbe6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "a0b219397f3943bfb066f61e1da1dc22ce9c4802bde58c18d542060c3779dbe6"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling free_macros v0.0.1
[INFO] [stderr] error: macros that expand to items must be delimited with braces or followed by a semicolon
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/free_macros-0.0.1/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] 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[E0658]: non-builtin inner attributes are unstable
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/free_macros-0.0.1/src/lib.rs:4:1
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: for more information, see https://github.com/rust-lang/rust/issues/54726
[INFO] [stderr]   = help: add `#![feature(custom_inner_attributes)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: cannot find attribute `license` in this scope
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/free_macros-0.0.1/src/lib.rs:4:4
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![license = "MIT"]
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[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" "a0b219397f3943bfb066f61e1da1dc22ce9c4802bde58c18d542060c3779dbe6"`
[INFO] running `"docker" "rm" "-f" "a0b219397f3943bfb066f61e1da1dc22ce9c4802bde58c18d542060c3779dbe6"`
[INFO] [stdout] a0b219397f3943bfb066f61e1da1dc22ce9c4802bde58c18d542060c3779dbe6