[INFO] crate cargo-mutagen 0.1.2 is already in cache
[INFO] extracting crate cargo-mutagen 0.1.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-mutagen/0.1.2
[INFO] extracting crate cargo-mutagen 0.1.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cargo-mutagen/0.1.2
[INFO] validating manifest of cargo-mutagen-0.1.2 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 cargo-mutagen-0.1.2 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 cargo-mutagen-0.1.2
[INFO] finished frobbing cargo-mutagen-0.1.2
[INFO] frobbed toml for cargo-mutagen-0.1.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-mutagen/0.1.2/Cargo.toml
[INFO] started frobbing cargo-mutagen-0.1.2
[INFO] finished frobbing cargo-mutagen-0.1.2
[INFO] frobbed toml for cargo-mutagen-0.1.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/cargo-mutagen/0.1.2/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 cargo-mutagen-0.1.2 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-mutagen/0.1.2:/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] a8b09344f664b5cde44142e84928f7254494888e4f92be95faf82e27c3265686
[INFO] running `"docker" "start" "-a" "a8b09344f664b5cde44142e84928f7254494888e4f92be95faf82e27c3265686"`
[INFO] [stderr]    Compiling wait-timeout v0.1.5
[INFO] [stderr]    Compiling cargo-mutagen v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:48:31
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn run_mutations(runner: &mut Runner, list: &[String]) -> Result<()> {
[INFO] [stderr]    |                               ^^^^^^ help: use `dyn`: `dyn Runner`
[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/main.rs:161:26
[INFO] [stderr]     |
[INFO] [stderr] 161 |         let runner: &mut Runner = if with_coverage {
[INFO] [stderr]     |                          ^^^^^^ help: use `dyn`: `dyn Runner`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.53s
[INFO] running `"docker" "inspect" "a8b09344f664b5cde44142e84928f7254494888e4f92be95faf82e27c3265686"`
[INFO] running `"docker" "rm" "-f" "a8b09344f664b5cde44142e84928f7254494888e4f92be95faf82e27c3265686"`
[INFO] [stdout] a8b09344f664b5cde44142e84928f7254494888e4f92be95faf82e27c3265686
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-mutagen/0.1.2:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 792900b4fbf3a37baba493748e542d89ae20e9dfa68efe8e47e76456afca63bf
[INFO] running `"docker" "start" "-a" "792900b4fbf3a37baba493748e542d89ae20e9dfa68efe8e47e76456afca63bf"`
[INFO] [stderr]    Compiling cargo-mutagen v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:48:31
[INFO] [stderr]    |
[INFO] [stderr] 48 | fn run_mutations(runner: &mut Runner, list: &[String]) -> Result<()> {
[INFO] [stderr]    |                               ^^^^^^ help: use `dyn`: `dyn Runner`
[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/main.rs:161:26
[INFO] [stderr]     |
[INFO] [stderr] 161 |         let runner: &mut Runner = if with_coverage {
[INFO] [stderr]     |                          ^^^^^^ help: use `dyn`: `dyn Runner`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.43s
[INFO] running `"docker" "inspect" "792900b4fbf3a37baba493748e542d89ae20e9dfa68efe8e47e76456afca63bf"`
[INFO] running `"docker" "rm" "-f" "792900b4fbf3a37baba493748e542d89ae20e9dfa68efe8e47e76456afca63bf"`
[INFO] [stdout] 792900b4fbf3a37baba493748e542d89ae20e9dfa68efe8e47e76456afca63bf
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/cargo-mutagen/0.1.2:/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" "test" "--frozen"`
[INFO] [stdout] ebf1b49bc94af97c96cd860d48bc7d60f8e85151ec9ee47e2a960cc353f66e44
[INFO] running `"docker" "start" "-a" "ebf1b49bc94af97c96cd860d48bc7d60f8e85151ec9ee47e2a960cc353f66e44"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cargo_mutagen-8fd3f91f941f6c69
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test runner::tests::it_returns_no_tests_on_empty ... ok
[INFO] [stdout] test runner::tests::it_returns_test_if_they_were_added ... ok
[INFO] [stdout] test tests::it_decodes_well_formed_mutations ... ok
[INFO] [stdout] test tests::it_fails_to_decode_malformed_mutations ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "ebf1b49bc94af97c96cd860d48bc7d60f8e85151ec9ee47e2a960cc353f66e44"`
[INFO] running `"docker" "rm" "-f" "ebf1b49bc94af97c96cd860d48bc7d60f8e85151ec9ee47e2a960cc353f66e44"`
[INFO] [stdout] ebf1b49bc94af97c96cd860d48bc7d60f8e85151ec9ee47e2a960cc353f66e44