[INFO] crate indextree 3.3.0 is already in cache
[INFO] extracting crate indextree 3.3.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/indextree/3.3.0
[INFO] extracting crate indextree 3.3.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/indextree/3.3.0
[INFO] validating manifest of indextree-3.3.0 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 indextree-3.3.0 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 indextree-3.3.0
[INFO] removed 2 missing examples
[INFO] finished frobbing indextree-3.3.0
[INFO] frobbed toml for indextree-3.3.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/indextree/3.3.0/Cargo.toml
[INFO] started frobbing indextree-3.3.0
[INFO] removed 2 missing examples
[INFO] finished frobbing indextree-3.3.0
[INFO] frobbed toml for indextree-3.3.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/indextree/3.3.0/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 indextree-3.3.0 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/indextree/3.3.0:/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] 98ec1620931c587ecf12261eb58a7e2ceed475e6640c55c6163b668c59e8bcd5
[INFO] running `"docker" "start" "-a" "98ec1620931c587ecf12261eb58a7e2ceed475e6640c55c6163b668c59e8bcd5"`
[INFO] [stderr]    Compiling indextree v3.3.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "98ec1620931c587ecf12261eb58a7e2ceed475e6640c55c6163b668c59e8bcd5"`
[INFO] running `"docker" "rm" "-f" "98ec1620931c587ecf12261eb58a7e2ceed475e6640c55c6163b668c59e8bcd5"`
[INFO] [stdout] 98ec1620931c587ecf12261eb58a7e2ceed475e6640c55c6163b668c59e8bcd5
[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/indextree/3.3.0:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] a4ce0199a34e32d6a3226b4af05a851aa4b7252e054e5fa21ec47de90513c8cf
[INFO] running `"docker" "start" "-a" "a4ce0199a34e32d6a3226b4af05a851aa4b7252e054e5fa21ec47de90513c8cf"`
[INFO] [stderr]    Compiling indextree v3.3.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `rayon`
[INFO] [stderr]  --> examples/parallel_iteration.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rayon::prelude::*;
[INFO] [stderr]   |     ^^^^^ use of undeclared type or module `rayon`
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rayon::prelude::*`
[INFO] [stderr]  --> examples/parallel_iteration.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use rayon::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `par_iter` found for type `&mut indextree::Arena<{integer}>` in the current scope
[INFO] [stderr]   --> examples/parallel_iteration.rs:20:10
[INFO] [stderr]    |
[INFO] [stderr] 20 |         .par_iter()
[INFO] [stderr]    |          ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0609]: no field `data` on type `&mut _`
[INFO] [stderr]   --> examples/parallel_iteration.rs:21:29
[INFO] [stderr]    |
[INFO] [stderr] 21 |         .map(|ref mut i| (i.data as f64).sqrt())
[INFO] [stderr]    |                             ^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0433, E0599, E0609.
[INFO] [stderr] For more information about an error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `indextree`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a4ce0199a34e32d6a3226b4af05a851aa4b7252e054e5fa21ec47de90513c8cf"`
[INFO] running `"docker" "rm" "-f" "a4ce0199a34e32d6a3226b4af05a851aa4b7252e054e5fa21ec47de90513c8cf"`
[INFO] [stdout] a4ce0199a34e32d6a3226b4af05a851aa4b7252e054e5fa21ec47de90513c8cf