[INFO] crate bstring_macros 0.1.0 is already in cache
[INFO] extracting crate bstring_macros 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/bstring_macros/0.1.0
[INFO] extracting crate bstring_macros 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/bstring_macros/0.1.0
[INFO] validating manifest of bstring_macros-0.1.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bstring_macros-0.1.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bstring_macros-0.1.0
[INFO] finished frobbing bstring_macros-0.1.0
[INFO] frobbed toml for bstring_macros-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/bstring_macros/0.1.0/Cargo.toml
[INFO] started frobbing bstring_macros-0.1.0
[INFO] finished frobbing bstring_macros-0.1.0
[INFO] frobbed toml for bstring_macros-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/bstring_macros/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing bstring_macros-0.1.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/bstring_macros/0.1.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 15676bc3c7181ad3612fbca80aa1dbcc422c9ee0a9ff7fc73632de03c7446aa0
[INFO] running `"docker" "start" "-a" "15676bc3c7181ad3612fbca80aa1dbcc422c9ee0a9ff7fc73632de03c7446aa0"`
[INFO] [stderr]    Compiling ref_slice v1.1.1
[INFO] [stderr]    Compiling proc-macro-hack-impl v0.3.3
[INFO] [stderr]    Compiling bstring v0.1.0
[INFO] [stderr]    Compiling proc-macro-hack v0.3.3
[INFO] [stderr]    Compiling bstring_macros_hack v0.1.0
[INFO] [stderr]    Compiling bstring_macros v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: proc-macro derive panicked
[INFO] [stderr]   --> src/lib.rs:37:1
[INFO] [stderr]    |
[INFO] [stderr] 37 | / proc_macro_expr_decl!{
[INFO] [stderr] 38 | |     /// Produces a `bstring::Arguments` value, which can be passed to other
[INFO] [stderr] 39 | |     /// formatting functions.
[INFO] [stderr] 40 | |     ///
[INFO] [stderr] ...  |
[INFO] [stderr] 43 | |     bformat_args! => bformat_args_impl
[INFO] [stderr] 44 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = help: message: assertion failed: `(left == right)`
[INFO] [stderr]              left: `Some("#[allow(unused,")`,
[INFO] [stderr]             right: `Some("#[allow(unused")`
[INFO] [stderr]    = note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `bstring_macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "15676bc3c7181ad3612fbca80aa1dbcc422c9ee0a9ff7fc73632de03c7446aa0"`
[INFO] running `"docker" "rm" "-f" "15676bc3c7181ad3612fbca80aa1dbcc422c9ee0a9ff7fc73632de03c7446aa0"`
[INFO] [stdout] 15676bc3c7181ad3612fbca80aa1dbcc422c9ee0a9ff7fc73632de03c7446aa0