Sep 04 09:14:50.690 INFO checking rfcalcs-0.1.1 against master#2687112ea6a8701cbf36e6dd4d77d64694cf93d8 for pr-53913
Sep 04 09:14:50.690 INFO running: cargo +2687112ea6a8701cbf36e6dd4d77d64694cf93d8-alt check --frozen --all --all-targets
Sep 04 09:14:50.690 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-0/pr-53913/master#2687112ea6a8701cbf36e6dd4d77d64694cf93d8:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-53913/worker-0/master#2687112ea6a8701cbf36e6dd4d77d64694cf93d8:/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 +2687112ea6a8701cbf36e6dd4d77d64694cf93d8-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-m" "2G" "crater"`
Sep 04 09:14:50.935 INFO blam! c89c35d33c3495194834cf056ec5fb106b2c20abef61fbf280b743c5eb10db6c
Sep 04 09:14:50.937 INFO running `"docker" "start" "-a" "c89c35d33c3495194834cf056ec5fb106b2c20abef61fbf280b743c5eb10db6c"`
Sep 04 09:14:51.853 INFO kablam!     Checking assert_approx_eq v1.0.0
Sep 04 09:14:52.196 INFO kablam!     Checking rfcalcs v0.1.1 (file:///source)
Sep 04 09:14:52.246 INFO kablam! error[E0658]: attributes on expressions are experimental. (see issue #15701)
Sep 04 09:14:52.247 INFO kablam!   --> src/lib.rs:33:9
Sep 04 09:14:52.247 INFO kablam!    |
Sep 04 09:14:52.247 INFO kablam! 33 |         /// Test against precalculated results
Sep 04 09:14:52.247 INFO kablam!    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sep 04 09:14:52.247 INFO kablam!    |
Sep 04 09:14:52.247 INFO kablam!    = help: add #![feature(stmt_expr_attributes)] to the crate attributes to enable
Sep 04 09:14:52.247 INFO kablam!    = help: `///` is for documentation comments. For a plain comment, use `//`.
Sep 04 09:14:52.247 INFO kablam! 
Sep 04 09:14:52.573 INFO kablam! error: aborting due to previous error
Sep 04 09:14:52.573 INFO kablam! 
Sep 04 09:14:52.573 INFO kablam! For more information about this error, try `rustc --explain E0658`.
Sep 04 09:14:52.578 INFO kablam! error: Could not compile `rfcalcs`.
Sep 04 09:14:52.578 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 04 09:14:52.629 INFO kablam! warning: the feature `use_extern_macros` has been stable since 1.30.0 and no longer requires an attribute to enable
Sep 04 09:14:52.629 INFO kablam!  --> src/lib.rs:1:12
Sep 04 09:14:52.629 INFO kablam!   |
Sep 04 09:14:52.629 INFO kablam! 1 | #![feature(use_extern_macros)]
Sep 04 09:14:52.629 INFO kablam!   |            ^^^^^^^^^^^^^^^^^
Sep 04 09:14:52.630 INFO kablam!   |
Sep 04 09:14:52.630 INFO kablam!   = note: #[warn(stable_features)] on by default
Sep 04 09:14:52.630 INFO kablam! 
Sep 04 09:14:52.666 INFO kablam! error: build failed
Sep 04 09:14:52.668 INFO kablam! su: No module specific data is present
Sep 04 09:14:53.302 INFO running `"docker" "rm" "-f" "c89c35d33c3495194834cf056ec5fb106b2c20abef61fbf280b743c5eb10db6c"`
Sep 04 09:14:53.387 INFO blam! c89c35d33c3495194834cf056ec5fb106b2c20abef61fbf280b743c5eb10db6c