[INFO] crate rust-jni-generator 0.1.0 is already in cache
[INFO] extracting crate rust-jni-generator 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/rust-jni-generator/0.1.0
[INFO] extracting crate rust-jni-generator 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rust-jni-generator/0.1.0
[INFO] validating manifest of rust-jni-generator-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 rust-jni-generator-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 rust-jni-generator-0.1.0
[INFO] finished frobbing rust-jni-generator-0.1.0
[INFO] frobbed toml for rust-jni-generator-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/rust-jni-generator/0.1.0/Cargo.toml
[INFO] started frobbing rust-jni-generator-0.1.0
[INFO] finished frobbing rust-jni-generator-0.1.0
[INFO] frobbed toml for rust-jni-generator-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/rust-jni-generator/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 rust-jni-generator-0.1.0 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/rust-jni-generator/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 2c67602ca6004bc78b2c532063c5e97ad9b50d5e903d6c2a3ad6d4ae1615640e
[INFO] running `"docker" "start" "-a" "2c67602ca6004bc78b2c532063c5e97ad9b50d5e903d6c2a3ad6d4ae1615640e"`
[INFO] [stderr]    Compiling rust-jni v0.1.0
[INFO] [stderr]    Compiling rust-jni-generator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1784:29
[INFO] [stderr]      |
[INFO] [stderr] 1784 |                         let mut implements = implements
[INFO] [stderr]      |                             ----^^^^^^^^^^
[INFO] [stderr]      |                             |
[INFO] [stderr]      |                             help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.14s
[INFO] running `"docker" "inspect" "2c67602ca6004bc78b2c532063c5e97ad9b50d5e903d6c2a3ad6d4ae1615640e"`
[INFO] running `"docker" "rm" "-f" "2c67602ca6004bc78b2c532063c5e97ad9b50d5e903d6c2a3ad6d4ae1615640e"`
[INFO] [stdout] 2c67602ca6004bc78b2c532063c5e97ad9b50d5e903d6c2a3ad6d4ae1615640e
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/rust-jni-generator/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 1c202e2efaa1a7c611fb9a9d8d92b84e761b33f6948f178415064c8f6ea9d05e
[INFO] running `"docker" "start" "-a" "1c202e2efaa1a7c611fb9a9d8d92b84e761b33f6948f178415064c8f6ea9d05e"`
[INFO] [stderr]    Compiling rust-jni-generator v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: proc macro panicked
[INFO] [stderr]   --> tests/test.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 | /         java_generate! {
[INFO] [stderr] 35 | |             public interface c.d.TestInterface2 extends e.f.TestInterface1 {}
[INFO] [stderr] 36 | |
[INFO] [stderr] 37 | |             public class c.d.TestClass1 {
[INFO] [stderr] ...  |
[INFO] [stderr] 61 | |             }
[INFO] [stderr] 62 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: message: called `Option::unwrap()` on a `None` value
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust-jni-generator`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:1784:29
[INFO] [stderr]      |
[INFO] [stderr] 1784 |                         let mut implements = implements
[INFO] [stderr]      |                             ----^^^^^^^^^^
[INFO] [stderr]      |                             |
[INFO] [stderr]      |                             help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "1c202e2efaa1a7c611fb9a9d8d92b84e761b33f6948f178415064c8f6ea9d05e"`
[INFO] running `"docker" "rm" "-f" "1c202e2efaa1a7c611fb9a9d8d92b84e761b33f6948f178415064c8f6ea9d05e"`
[INFO] [stdout] 1c202e2efaa1a7c611fb9a9d8d92b84e761b33f6948f178415064c8f6ea9d05e