Sep 01 09:24:47.701 INFO checking rfcalcs-0.1.1 against try#aa245a5862056b681d2ccdb178f58891108cd3a6 for pr-53831
Sep 01 09:24:47.701 INFO running: cargo +aa245a5862056b681d2ccdb178f58891108cd3a6-alt check --frozen --all --all-targets
Sep 01 09:24:47.701 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-3/pr-53831/try#aa245a5862056b681d2ccdb178f58891108cd3a6:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53831/worker-3/try#aa245a5862056b681d2ccdb178f58891108cd3a6:/target:rw,Z" "-v" "/home/ec2-user/crater/./work/local/cargo-home:/cargo-home:ro,Z" "-v" "/home/ec2-user/crater/./work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=500" "-e" "CMD=cargo +aa245a5862056b681d2ccdb178f58891108cd3a6-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 01 09:24:47.894 INFO blam! 6c14177312b15675edd97efdd354cd33d3a4b036d7b44dd7ab6e20d3f109d7bf
Sep 01 09:24:47.896 INFO running `"docker" "start" "-a" "6c14177312b15675edd97efdd354cd33d3a4b036d7b44dd7ab6e20d3f109d7bf"`
Sep 01 09:24:48.640 INFO kablam!     Checking assert_approx_eq v1.0.0
Sep 01 09:24:48.984 INFO kablam!     Checking rfcalcs v0.1.1 (file:///source)
Sep 01 09:24:49.040 INFO kablam! error[E0658]: attributes on expressions are experimental. (see issue #15701)
Sep 01 09:24:49.040 INFO kablam!   --> src/lib.rs:33:9
Sep 01 09:24:49.040 INFO kablam!    |
Sep 01 09:24:49.040 INFO kablam! 33 |         /// Test against precalculated results
Sep 01 09:24:49.040 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sep 01 09:24:49.041 INFO kablam!    |
Sep 01 09:24:49.041 INFO kablam!    = help: add #![feature(stmt_expr_attributes)] to the crate attributes to enable
Sep 01 09:24:49.041 INFO kablam!    = help: `///` is for documentation comments. For a plain comment, use `//`.
Sep 01 09:24:49.042 INFO kablam! 
Sep 01 09:24:49.391 INFO kablam! error: aborting due to previous error
Sep 01 09:24:49.391 INFO kablam! 
Sep 01 09:24:49.391 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 01 09:24:49.396 INFO kablam! error: Could not compile `rfcalcs`.
Sep 01 09:24:49.397 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 01 09:24:49.438 INFO kablam! warning: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
Sep 01 09:24:49.438 INFO kablam!  --> src/lib.rs:1:12
Sep 01 09:24:49.438 INFO kablam!   |
Sep 01 09:24:49.438 INFO kablam! 1 | #![feature(use_extern_macros)]
Sep 01 09:24:49.439 INFO kablam!   |            ^^^^^^^^^^^^^^^^^
Sep 01 09:24:49.439 INFO kablam!   |
Sep 01 09:24:49.439 INFO kablam!   = note: #[warn(stable_features)] on by default
Sep 01 09:24:49.439 INFO kablam! 
Sep 01 09:24:49.491 INFO kablam! error: build failed
Sep 01 09:24:49.492 INFO kablam! su: No module specific data is present
Sep 01 09:24:50.014 INFO running `"docker" "rm" "-f" "6c14177312b15675edd97efdd354cd33d3a4b036d7b44dd7ab6e20d3f109d7bf"`
Sep 01 09:24:50.153 INFO blam! 6c14177312b15675edd97efdd354cd33d3a4b036d7b44dd7ab6e20d3f109d7bf