[INFO] updating cached repository blockexplorer/issueboss
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/blockexplorer/issueboss
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/blockexplorer/issueboss" "work/ex/beta-1.38-1/sources/1.37.0/gh/blockexplorer/issueboss"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/blockexplorer/issueboss'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/blockexplorer/issueboss" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/blockexplorer/issueboss"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/blockexplorer/issueboss'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8dab96da3684dbf98893f42988c5326673be7d77
[INFO] sha for GitHub repo blockexplorer/issueboss: 8dab96da3684dbf98893f42988c5326673be7d77
[INFO] validating manifest of blockexplorer/issueboss 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 blockexplorer/issueboss 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 blockexplorer/issueboss
[INFO] finished frobbing blockexplorer/issueboss
[INFO] frobbed toml for blockexplorer/issueboss written to work/ex/beta-1.38-1/sources/1.37.0/gh/blockexplorer/issueboss/Cargo.toml
[INFO] started frobbing blockexplorer/issueboss
[INFO] finished frobbing blockexplorer/issueboss
[INFO] frobbed toml for blockexplorer/issueboss written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/blockexplorer/issueboss/Cargo.toml
[INFO] crate blockexplorer/issueboss already has a lockfile, it will not be regenerated
[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 blockexplorer/issueboss 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-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/blockexplorer/issueboss:/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] 25eeb722d3dd61068df6c61b8862574ea550d089d5e769f39b265da436d37f01
[INFO] running `"docker" "start" "-a" "25eeb722d3dd61068df6c61b8862574ea550d089d5e769f39b265da436d37f01"`
[INFO] [stderr]    Compiling pulldown-cmark v0.1.2
[INFO] [stderr]    Compiling combine v3.0.0-alpha.2
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling structopt-derive v0.2.3
[INFO] [stderr]    Compiling structopt v0.2.3
[INFO] [stderr]    Compiling toml_edit v0.1.1
[INFO] [stderr] error[E0502]: cannot borrow `v` as immutable because it is also borrowed as mutable
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/toml_edit-0.1.1/src/index.rs:54:65
[INFO] [stderr]    |
[INFO] [stderr] 44 |       fn index_or_insert<'v>(&self, v: &'v mut Item) -> &'v mut Item {
[INFO] [stderr]    |                          -- lifetime `'v` defined here
[INFO] [stderr] 45 | /         match *v {
[INFO] [stderr] 46 | |             Item::ArrayOfTables(ref mut vec) => {
[INFO] [stderr] 47 | |                 vec.values.get_mut(*self).expect("index out of bounds")
[INFO] [stderr] 48 | |             }
[INFO] [stderr] 49 | |             Item::Value(ref mut a) if a.is_array() => a.as_array_mut()
[INFO] [stderr]    | |                         --------- mutable borrow occurs here
[INFO] [stderr] ...  |
[INFO] [stderr] 54 | |             _ => panic!("cannot access index {} in {:?}", self, v),
[INFO] [stderr]    | |                                                                 ^ immutable borrow occurs here
[INFO] [stderr] 55 | |         }
[INFO] [stderr]    | |_________- returning this value requires that `v.0` is borrowed for `'v`
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `v` as immutable because it is also borrowed as mutable
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/toml_edit-0.1.1/src/index.rs:85:63
[INFO] [stderr]    |
[INFO] [stderr] 68 |       fn index_or_insert<'v>(&self, v: &'v mut Item) -> &'v mut Item {
[INFO] [stderr]    |                          -- lifetime `'v` defined here
[INFO] [stderr] ...
[INFO] [stderr] 75 | /         match *v {
[INFO] [stderr] 76 | |             Item::Table(ref mut t) => t.entry(self).or_insert(Item::None),
[INFO] [stderr] 77 | |             Item::Value(ref mut v) if v.is_inline_table() => {
[INFO] [stderr]    | |                         --------- mutable borrow occurs here
[INFO] [stderr] 78 | |                 &mut v.as_inline_table_mut()
[INFO] [stderr] ...  |
[INFO] [stderr] 85 | |             _ => panic!("cannot access key {} in {:?}", self, v),
[INFO] [stderr]    | |                                                               ^ immutable borrow occurs here
[INFO] [stderr] 86 | |         }
[INFO] [stderr]    | |_________- returning this value requires that `v.0` is borrowed for `'v`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0502`.
[INFO] [stderr] error: Could not compile `toml_edit`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "25eeb722d3dd61068df6c61b8862574ea550d089d5e769f39b265da436d37f01"`
[INFO] running `"docker" "rm" "-f" "25eeb722d3dd61068df6c61b8862574ea550d089d5e769f39b265da436d37f01"`
[INFO] [stdout] 25eeb722d3dd61068df6c61b8862574ea550d089d5e769f39b265da436d37f01