[INFO] crate from_error_scope 0.0.1 is already in cache
[INFO] extracting crate from_error_scope 0.0.1 into work/ex/beta-1.37-6/sources/1.36.0/reg/from_error_scope/0.0.1
[INFO] extracting crate from_error_scope 0.0.1 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/from_error_scope/0.0.1
[INFO] validating manifest of from_error_scope-0.0.1 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 from_error_scope-0.0.1 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 from_error_scope-0.0.1
[INFO] finished frobbing from_error_scope-0.0.1
[INFO] frobbed toml for from_error_scope-0.0.1 written to work/ex/beta-1.37-6/sources/1.36.0/reg/from_error_scope/0.0.1/Cargo.toml
[INFO] started frobbing from_error_scope-0.0.1
[INFO] finished frobbing from_error_scope-0.0.1
[INFO] frobbed toml for from_error_scope-0.0.1 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/from_error_scope/0.0.1/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing from_error_scope-0.0.1 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/from_error_scope/0.0.1:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 98fa32e15883f4f95eee993ab06e642969cddbee5829ddf00f99866c9b2d6406
[INFO] running `"docker" "start" "-a" "98fa32e15883f4f95eee993ab06e642969cddbee5829ddf00f99866c9b2d6406"`
[INFO] [stderr]    Compiling from_error_scope v0.0.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `"docker" "inspect" "98fa32e15883f4f95eee993ab06e642969cddbee5829ddf00f99866c9b2d6406"`
[INFO] running `"docker" "rm" "-f" "98fa32e15883f4f95eee993ab06e642969cddbee5829ddf00f99866c9b2d6406"`
[INFO] [stdout] 98fa32e15883f4f95eee993ab06e642969cddbee5829ddf00f99866c9b2d6406
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/from_error_scope/0.0.1:/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-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 273fb93e3b62b1dab1cc2f1e50ca5a6beff498ede517107bb566a2bc54b7ce9f
[INFO] running `"docker" "start" "-a" "273fb93e3b62b1dab1cc2f1e50ca5a6beff498ede517107bb566a2bc54b7ce9f"`
[INFO] [stderr]    Compiling from_error_scope v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::io::CharsError`
[INFO] [stderr]   --> examples/simple.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | use std::io::CharsError;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^ no `CharsError` in `io`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the beta release channel
[INFO] [stderr]   --> examples/simple.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(core, io)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `from_error_scope`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "273fb93e3b62b1dab1cc2f1e50ca5a6beff498ede517107bb566a2bc54b7ce9f"`
[INFO] running `"docker" "rm" "-f" "273fb93e3b62b1dab1cc2f1e50ca5a6beff498ede517107bb566a2bc54b7ce9f"`
[INFO] [stdout] 273fb93e3b62b1dab1cc2f1e50ca5a6beff498ede517107bb566a2bc54b7ce9f