Sep 10 21:45:57.593 INFO checking calculator-0.0.1 against master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1 for pr-54090
Sep 10 21:45:57.593 INFO running: cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets
Sep 10 21:45:57.593 INFO running `"docker" "create" "-v" "/home/ec2-user/crater/./work/local/test-source/worker-4/pr-54090/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/source:ro,Z" "-v" "/home/ec2-user/crater/./work/local/target-dirs/pr-54090/worker-4/master#f50b7758f4dc85dc1c5e38258adaa94213ac6ed1:/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=1000" "-e" "CMD=cargo +f50b7758f4dc85dc1c5e38258adaa94213ac6ed1-alt check --frozen --all --all-targets" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-m" "2G" "crater"`
Sep 10 21:45:57.779 INFO blam! 7da6aba74d4190bb844e678cc1806c5b21e0e77649747747873f202b2e8ebf51
Sep 10 21:45:57.781 INFO running `"docker" "start" "-a" "7da6aba74d4190bb844e678cc1806c5b21e0e77649747747873f202b2e8ebf51"`
Sep 10 21:45:58.454 INFO kablam! usermod: no changes
Sep 10 21:45:58.486 INFO kablam!     Checking vec_map v0.0.1
Sep 10 21:45:58.959 INFO kablam!     Checking calculator v0.0.1 (file:///source)
Sep 10 21:45:59.489 INFO kablam! error[E0635]: unknown feature `collections`
Sep 10 21:45:59.489 INFO kablam!  --> src/expr.rs:4:12
Sep 10 21:45:59.489 INFO kablam!   |
Sep 10 21:45:59.489 INFO kablam! 4 | #![feature(collections)]
Sep 10 21:45:59.489 INFO kablam!   |            ^^^^^^^^^^^
Sep 10 21:45:59.494 INFO kablam! 
Sep 10 21:45:59.506 INFO kablam! error: aborting due to previous error
Sep 10 21:45:59.510 INFO kablam! 
Sep 10 21:45:59.510 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 10 21:45:59.522 INFO kablam! error: Could not compile `calculator`.
Sep 10 21:45:59.522 INFO kablam! warning: build failed, waiting for other jobs to finish...
Sep 10 21:45:59.642 INFO kablam! error[E0635]: unknown feature `collections`
Sep 10 21:45:59.642 INFO kablam!  --> src/expr.rs:4:12
Sep 10 21:45:59.642 INFO kablam!   |
Sep 10 21:45:59.642 INFO kablam! 4 | #![feature(collections)]
Sep 10 21:45:59.642 INFO kablam!   |            ^^^^^^^^^^^
Sep 10 21:45:59.642 INFO kablam! 
Sep 10 21:45:59.670 INFO kablam! error: aborting due to previous error
Sep 10 21:45:59.670 INFO kablam! 
Sep 10 21:45:59.670 INFO kablam! For more information about this error, try `rustc --explain E0635`.
Sep 10 21:45:59.677 INFO kablam! error: Could not compile `calculator`.
Sep 10 21:45:59.677 INFO kablam! 
Sep 10 21:45:59.677 INFO kablam! To learn more, run the command again with --verbose.
Sep 10 21:45:59.678 INFO kablam! su: No module specific data is present
Sep 10 21:46:00.753 INFO running `"docker" "rm" "-f" "7da6aba74d4190bb844e678cc1806c5b21e0e77649747747873f202b2e8ebf51"`
Sep 10 21:46:00.828 INFO blam! 7da6aba74d4190bb844e678cc1806c5b21e0e77649747747873f202b2e8ebf51