[INFO] crate cargo-mutagen 0.1.2 is already in cache
[INFO] extracting crate cargo-mutagen 0.1.2 into work/ex/beta-1.37-6/sources/1.36.0/reg/cargo-mutagen/0.1.2
[INFO] extracting crate cargo-mutagen 0.1.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/cargo-mutagen/0.1.2
[INFO] validating manifest of cargo-mutagen-0.1.2 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 cargo-mutagen-0.1.2 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 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-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/reg/cargo-mutagen/0.1.2/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 cargo-mutagen-0.1.2 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/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] cf7696451a6a78b5b052d9d95eeb5f47a201a62dbd87d5f359c3d51f0ce72540
[INFO] running `"docker" "start" "-a" "cf7696451a6a78b5b052d9d95eeb5f47a201a62dbd87d5f359c3d51f0ce72540"`
[INFO] [stderr]    Compiling json v0.11.14
[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 5.90s
[INFO] running `"docker" "inspect" "cf7696451a6a78b5b052d9d95eeb5f47a201a62dbd87d5f359c3d51f0ce72540"`
[INFO] running `"docker" "rm" "-f" "cf7696451a6a78b5b052d9d95eeb5f47a201a62dbd87d5f359c3d51f0ce72540"`
[INFO] [stdout] cf7696451a6a78b5b052d9d95eeb5f47a201a62dbd87d5f359c3d51f0ce72540
[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/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0facf358526b78c4897a36245620410e3799365cab6ca7e935039e04d1b568cf
[INFO] running `"docker" "start" "-a" "0facf358526b78c4897a36245620410e3799365cab6ca7e935039e04d1b568cf"`
[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 1.74s
[INFO] running `"docker" "inspect" "0facf358526b78c4897a36245620410e3799365cab6ca7e935039e04d1b568cf"`
[INFO] running `"docker" "rm" "-f" "0facf358526b78c4897a36245620410e3799365cab6ca7e935039e04d1b568cf"`
[INFO] [stdout] 0facf358526b78c4897a36245620410e3799365cab6ca7e935039e04d1b568cf
[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/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 1c592d317b45799a528ccb68c9d92565b1b3c7d2b3b542075cf5b2ae61c9544c
[INFO] running `"docker" "start" "-a" "1c592d317b45799a528ccb68c9d92565b1b3c7d2b3b542075cf5b2ae61c9544c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cargo_mutagen-dede7ffcec3c94e2
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test runner::tests::it_returns_no_tests_on_empty ... ok
[INFO] [stdout] test tests::it_fails_to_decode_malformed_mutations ... ok
[INFO] [stdout] test tests::it_decodes_well_formed_mutations ... ok
[INFO] [stdout] test runner::tests::it_returns_test_if_they_were_added ... 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" "1c592d317b45799a528ccb68c9d92565b1b3c7d2b3b542075cf5b2ae61c9544c"`
[INFO] running `"docker" "rm" "-f" "1c592d317b45799a528ccb68c9d92565b1b3c7d2b3b542075cf5b2ae61c9544c"`
[INFO] [stdout] 1c592d317b45799a528ccb68c9d92565b1b3c7d2b3b542075cf5b2ae61c9544c