[INFO] updating cached repository studoot/duplicate-finder
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/studoot/duplicate-finder
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/studoot/duplicate-finder" "work/ex/beta-1.38-1/sources/1.37.0/gh/studoot/duplicate-finder"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/studoot/duplicate-finder'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/studoot/duplicate-finder" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/studoot/duplicate-finder"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/studoot/duplicate-finder'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f1871cb936f41bd21be38188189a825341f7f239
[INFO] sha for GitHub repo studoot/duplicate-finder: f1871cb936f41bd21be38188189a825341f7f239
[INFO] validating manifest of studoot/duplicate-finder 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 studoot/duplicate-finder 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 studoot/duplicate-finder
[INFO] finished frobbing studoot/duplicate-finder
[INFO] frobbed toml for studoot/duplicate-finder written to work/ex/beta-1.38-1/sources/1.37.0/gh/studoot/duplicate-finder/Cargo.toml
[INFO] started frobbing studoot/duplicate-finder
[INFO] finished frobbing studoot/duplicate-finder
[INFO] frobbed toml for studoot/duplicate-finder written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/studoot/duplicate-finder/Cargo.toml
[INFO] crate studoot/duplicate-finder 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 studoot/duplicate-finder 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/studoot/duplicate-finder:/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] e74dc8a670c90bbdba9574d472123afbae47232d902977bd28747171ec5f494f
[INFO] running `"docker" "start" "-a" "e74dc8a670c90bbdba9574d472123afbae47232d902977bd28747171ec5f494f"`
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling coco v0.1.1
[INFO] [stderr]    Compiling thread_local v0.3.4
[INFO] [stderr]    Compiling multimap v0.4.0
[INFO] [stderr]    Compiling structopt-derive v0.1.1
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling term_size v0.3.0
[INFO] [stderr]    Compiling num_cpus v1.6.2
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling atty v0.2.2
[INFO] [stderr]    Compiling textwrap v0.8.0
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr]    Compiling clap v2.26.2
[INFO] [stderr]    Compiling regex v0.2.2
[INFO] [stderr]    Compiling rayon-core v1.2.1
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling globset v0.2.0
[INFO] [stderr]    Compiling ignore v0.2.2
[INFO] [stderr]    Compiling structopt v0.1.1
[INFO] [stderr]    Compiling duplicate-finder v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(attr_literals, rustc_private)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/output/csv.rs:9:35
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn output(&self, stream: &mut Write, d : &Duplicates) -> () {
[INFO] [stderr]   |                                   ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/output/json.rs:9:35
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn output(&self, stream: &mut Write, d : &Duplicates) -> () {
[INFO] [stderr]   |                                   ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/output/mod.rs:23:35
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn output(&self, stream: &mut Write, d : &Duplicates) -> ();
[INFO] [stderr]    |                                   ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/output/mod.rs:26:44
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn get_outputter(o: OutputType) -> Box<Outputter> {
[INFO] [stderr]    |                                            ^^^^^^^^^ help: use `dyn`: `dyn Outputter`
[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 `duplicate-finder`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e74dc8a670c90bbdba9574d472123afbae47232d902977bd28747171ec5f494f"`
[INFO] running `"docker" "rm" "-f" "e74dc8a670c90bbdba9574d472123afbae47232d902977bd28747171ec5f494f"`
[INFO] [stdout] e74dc8a670c90bbdba9574d472123afbae47232d902977bd28747171ec5f494f