[INFO] fetching crate rfcalcs 0.1.1...
[INFO] checking rfcalcs-0.1.1 against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] extracting crate rfcalcs 0.1.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate rfcalcs 0.1.1 on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate rfcalcs 0.1.1
[INFO] finished tweaking crates.io crate rfcalcs 0.1.1
[INFO] tweaked toml for crates.io crate rfcalcs 0.1.1 written to /workspace/builds/worker-2/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] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] bb55f789cb459e8c2566334e971d3845123d5642fb9b97ad76bfb04da38bdd72
[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" "bb55f789cb459e8c2566334e971d3845123d5642fb9b97ad76bfb04da38bdd72"`
[INFO] [stderr]     Checking assert_approx_eq v1.1.0
[INFO] [stderr]     Checking rfcalcs v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/fresnel.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         /// Magic Numbers from: http://www.wirelessconnections.net/calcs/FresnelZone.asp
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 68 |         let mut zone: f64;
[INFO] [stderr]    |         ------------------ rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/lib.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         /// Test against precalculated results
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 34 |         path_loss = free_space_path_loss(ghz(2.4), m(1e0));
[INFO] [stderr]    |         --------- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/fresnel.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         /// Magic Numbers from: http://www.wirelessconnections.net/calcs/FresnelZone.asp
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 68 |         let mut zone: f64;
[INFO] [stderr]    |         ------------------ rustdoc does not generate documentation for statements
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/lib.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         /// Test against precalculated results
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 34 |         path_loss = free_space_path_loss(ghz(2.4), m(1e0));
[INFO] [stderr]    |         --------- rustdoc does not generate documentation for expressions
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(use_extern_macros)]
[INFO] [stderr]   |            ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(stable_features)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0658]: attributes on expressions are experimental
[INFO] [stderr]   --> src/lib.rs:33:9
[INFO] [stderr]    |
[INFO] [stderr] 33 |         /// Test against precalculated results
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: for more information, see https://github.com/rust-lang/rust/issues/15701
[INFO] [stderr]    = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
[INFO] [stderr]    = help: `///` is for documentation comments. For a plain comment, use `//`.
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: could not compile `rfcalcs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "bb55f789cb459e8c2566334e971d3845123d5642fb9b97ad76bfb04da38bdd72"`
[INFO] running `"docker" "rm" "-f" "bb55f789cb459e8c2566334e971d3845123d5642fb9b97ad76bfb04da38bdd72"`
[INFO] [stdout] bb55f789cb459e8c2566334e971d3845123d5642fb9b97ad76bfb04da38bdd72