[INFO] crate regex_dfa 0.5.0 is already in cache
[INFO] extracting crate regex_dfa 0.5.0 into work/ex/beta-1.37-6/sources/1.36.0/reg/regex_dfa/0.5.0
[INFO] extracting crate regex_dfa 0.5.0 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/regex_dfa/0.5.0
[INFO] validating manifest of regex_dfa-0.5.0 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 regex_dfa-0.5.0 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 regex_dfa-0.5.0
[INFO] removed 0 missing tests
[INFO] finished frobbing regex_dfa-0.5.0
[INFO] frobbed toml for regex_dfa-0.5.0 written to work/ex/beta-1.37-6/sources/1.36.0/reg/regex_dfa/0.5.0/Cargo.toml
[INFO] started frobbing regex_dfa-0.5.0
[INFO] removed 0 missing tests
[INFO] finished frobbing regex_dfa-0.5.0
[INFO] frobbed toml for regex_dfa-0.5.0 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/regex_dfa/0.5.0/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] testing regex_dfa-0.5.0 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/regex_dfa/0.5.0:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 83b3a7e2ccad6397a4f92dbfcbb25737a3470d5bd3ce85ebad2ade2a5909eaf4
[INFO] running `"docker" "start" "-a" "83b3a7e2ccad6397a4f92dbfcbb25737a3470d5bd3ce85ebad2ade2a5909eaf4"`
[INFO] [stderr] warning: An explicit [[bench]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other benchmark targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a benchmark target:
[INFO] [stderr] 
[INFO] [stderr] * /opt/crater/workdir/benches/bench.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a benchmark target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autobenches = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/crater/workdir/src/lib.rs
[INFO] [stderr]    Compiling regex-syntax v0.2.6
[INFO] [stderr]    Compiling refinery v0.1.1
[INFO] [stderr]    Compiling range-map v0.1.5
[INFO] [stderr]    Compiling regex_dfa v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]   --> src/nfa/has_looks.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::cmp::max;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.21s
[INFO] running `"docker" "inspect" "83b3a7e2ccad6397a4f92dbfcbb25737a3470d5bd3ce85ebad2ade2a5909eaf4"`
[INFO] running `"docker" "rm" "-f" "83b3a7e2ccad6397a4f92dbfcbb25737a3470d5bd3ce85ebad2ade2a5909eaf4"`
[INFO] [stdout] 83b3a7e2ccad6397a4f92dbfcbb25737a3470d5bd3ce85ebad2ade2a5909eaf4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-6/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/regex_dfa/0.5.0:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 730dbd7bf8969a3185f616223c836b1f36a44594486cdca10166ce9699b97460
[INFO] running `"docker" "start" "-a" "730dbd7bf8969a3185f616223c836b1f36a44594486cdca10166ce9699b97460"`
[INFO] [stderr] warning: An explicit [[bench]] section is specified in Cargo.toml which currently
[INFO] [stderr] disables Cargo from automatically inferring other benchmark targets.
[INFO] [stderr] This inference behavior will change in the Rust 2018 edition and the following
[INFO] [stderr] files will be included as a benchmark target:
[INFO] [stderr] 
[INFO] [stderr] * /opt/crater/workdir/benches/bench.rs
[INFO] [stderr] 
[INFO] [stderr] This is likely to break cargo build or cargo test as these files may not be
[INFO] [stderr] ready to be compiled as a benchmark target today. You can future-proof yourself
[INFO] [stderr] and disable this warning by adding `autobenches = false` to your [package]
[INFO] [stderr] section. You may also move the files to a location where Cargo would not
[INFO] [stderr] automatically infer them to be a target, such as in subfolders.
[INFO] [stderr] 
[INFO] [stderr] For more information on this warning you can consult
[INFO] [stderr] https://github.com/rust-lang/cargo/issues/5330
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/crater/workdir/src/lib.rs
[INFO] [stderr]    Compiling serde v0.6.15
[INFO] [stderr]    Compiling quickcheck v0.2.27
[INFO] [stderr]    Compiling serde_json v0.6.1
[INFO] [stderr]    Compiling regex_dfa v0.5.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:61:19
[INFO] [stderr]    |
[INFO] [stderr] 61 | #![cfg_attr(test, feature(test))]
[INFO] [stderr]    |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `TestResult`, `quickcheck`
[INFO] [stderr]    --> src/dfa/prefix_searcher.rs:244:34
[INFO] [stderr]     |
[INFO] [stderr] 244 |     use quickcheck::{QuickCheck, quickcheck, StdGen, TestResult};
[INFO] [stderr]     |                                  ^^^^^^^^^^          ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]   --> src/nfa/has_looks.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::cmp::max;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:61:19
[INFO] [stderr]    |
[INFO] [stderr] 61 | #![cfg_attr(test, feature(test))]
[INFO] [stderr]    |                   ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> benches/bench_default.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(test)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `TestResult`, `quickcheck`
[INFO] [stderr]    --> src/dfa/prefix_searcher.rs:244:34
[INFO] [stderr]     |
[INFO] [stderr] 244 |     use quickcheck::{QuickCheck, quickcheck, StdGen, TestResult};
[INFO] [stderr]     |                                  ^^^^^^^^^^          ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]   --> src/nfa/has_looks.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use std::cmp::max;
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `regex_dfa`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `regex_dfa`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `regex_dfa`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "730dbd7bf8969a3185f616223c836b1f36a44594486cdca10166ce9699b97460"`
[INFO] running `"docker" "rm" "-f" "730dbd7bf8969a3185f616223c836b1f36a44594486cdca10166ce9699b97460"`
[INFO] [stdout] 730dbd7bf8969a3185f616223c836b1f36a44594486cdca10166ce9699b97460