[INFO] crate futures-await-async-macro 0.1.4 is already in cache
[INFO] extracting crate futures-await-async-macro 0.1.4 into work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-async-macro/0.1.4
[INFO] extracting crate futures-await-async-macro 0.1.4 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-await-async-macro/0.1.4
[INFO] validating manifest of futures-await-async-macro-0.1.4 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of futures-await-async-macro-0.1.4 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing futures-await-async-macro-0.1.4
[INFO] finished frobbing futures-await-async-macro-0.1.4
[INFO] frobbed toml for futures-await-async-macro-0.1.4 written to work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-async-macro/0.1.4/Cargo.toml
[INFO] started frobbing futures-await-async-macro-0.1.4
[INFO] finished frobbing futures-await-async-macro-0.1.4
[INFO] frobbed toml for futures-await-async-macro-0.1.4 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/futures-await-async-macro/0.1.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing futures-await-async-macro-0.1.4 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/futures-await-async-macro/0.1.4:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 1f80c3a3a184d2dcf598d16f80df0561a82eec99a6b16c1623c2b52b0c61c197
[INFO] running `"docker" "start" "-a" "1f80c3a3a184d2dcf598d16f80df0561a82eec99a6b16c1623c2b52b0c61c197"`
[INFO] [stderr]    Compiling futures-await-async-macro v0.1.4 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(proc_macro)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]   --> src/lib.rs:19:1
[INFO] [stderr]    |
[INFO] [stderr] 19 | #[macro_use]
[INFO] [stderr]    | ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:175:19
[INFO] [stderr]     |
[INFO] [stderr] 175 |     let mut result = Tokens::empty();
[INFO] [stderr]     |                      ^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:192:21
[INFO] [stderr]     |
[INFO] [stderr] 192 |     let mut gen_body = Tokens::empty();
[INFO] [stderr]     |                        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:211:17
[INFO] [stderr]     |
[INFO] [stderr] 211 |     let mut body = Tokens::empty();
[INFO] [stderr]     |                    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:467:18
[INFO] [stderr]     |
[INFO] [stderr] 467 |     let mut spans = Tokens::empty();
[INFO] [stderr]     |                     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:495:23
[INFO] [stderr]     |
[INFO] [stderr] 495 |     let mut new_tokens = Tokens::empty();
[INFO] [stderr]     |                          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'proc_macro2::TokenStream::empty': please use TokenStream::new
[INFO] [stderr]    --> src/lib.rs:510:23
[INFO] [stderr]     |
[INFO] [stderr] 510 |     let mut new_tokens = Tokens::empty();
[INFO] [stderr]     |                          ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `futures-await-async-macro`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1f80c3a3a184d2dcf598d16f80df0561a82eec99a6b16c1623c2b52b0c61c197"`
[INFO] running `"docker" "rm" "-f" "1f80c3a3a184d2dcf598d16f80df0561a82eec99a6b16c1623c2b52b0c61c197"`
[INFO] [stdout] 1f80c3a3a184d2dcf598d16f80df0561a82eec99a6b16c1623c2b52b0c61c197