[INFO] crate lepton-mux 0.0.1 is already in cache
[INFO] extracting crate lepton-mux 0.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/lepton-mux/0.0.1
[INFO] extracting crate lepton-mux 0.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lepton-mux/0.0.1
[INFO] validating manifest of lepton-mux-0.0.1 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 lepton-mux-0.0.1 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 lepton-mux-0.0.1
[INFO] finished frobbing lepton-mux-0.0.1
[INFO] frobbed toml for lepton-mux-0.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/lepton-mux/0.0.1/Cargo.toml
[INFO] started frobbing lepton-mux-0.0.1
[INFO] finished frobbing lepton-mux-0.0.1
[INFO] frobbed toml for lepton-mux-0.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/lepton-mux/0.0.1/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 lepton-mux-0.0.1 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/lepton-mux/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 3b4ca5c27611df4a204529eb1cea535f274f6d48230a6eb254e84df0bd587f47
[INFO] running `"docker" "start" "-a" "3b4ca5c27611df4a204529eb1cea535f274f6d48230a6eb254e84df0bd587f47"`
[INFO] [stderr]    Compiling lepton-mux v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/mux.rs:130:21
[INFO] [stderr]     |
[INFO] [stderr] 130 |                 let mut is_lagging = self.last_flush[index] + MAX_FLUSH_VARIANCE < max_flush;
[INFO] [stderr]     |                     ----^^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `"docker" "inspect" "3b4ca5c27611df4a204529eb1cea535f274f6d48230a6eb254e84df0bd587f47"`
[INFO] running `"docker" "rm" "-f" "3b4ca5c27611df4a204529eb1cea535f274f6d48230a6eb254e84df0bd587f47"`
[INFO] [stdout] 3b4ca5c27611df4a204529eb1cea535f274f6d48230a6eb254e84df0bd587f47
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/lepton-mux/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8bd7b6283d76a765225508f8d46c88a4a1c51b004ef40df059aa5c8af7be8579
[INFO] running `"docker" "start" "-a" "8bd7b6283d76a765225508f8d46c88a4a1c51b004ef40df059aa5c8af7be8579"`
[INFO] [stderr]    Compiling lepton-mux v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/mux.rs:130:21
[INFO] [stderr]     |
[INFO] [stderr] 130 |                 let mut is_lagging = self.last_flush[index] + MAX_FLUSH_VARIANCE < max_flush;
[INFO] [stderr]     |                     ----^^^^^^^^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.37s
[INFO] running `"docker" "inspect" "8bd7b6283d76a765225508f8d46c88a4a1c51b004ef40df059aa5c8af7be8579"`
[INFO] running `"docker" "rm" "-f" "8bd7b6283d76a765225508f8d46c88a4a1c51b004ef40df059aa5c8af7be8579"`
[INFO] [stdout] 8bd7b6283d76a765225508f8d46c88a4a1c51b004ef40df059aa5c8af7be8579
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/lepton-mux/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] d7741c11270dd17cc70f1d3cc5bf039af9d81a0c5be9cc5b743e3adcc3ab7cab
[INFO] running `"docker" "start" "-a" "d7741c11270dd17cc70f1d3cc5bf039af9d81a0c5be9cc5b743e3adcc3ab7cab"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/lepton_mux-5ae10b943ab26f77
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/integration_test-670a515549c3fe93
[INFO] [stdout] 
[INFO] [stdout] running 11 tests
[INFO] [stdout] test test_nano_mux ... ok
[INFO] [stdout] test test_short_mux ... ok
[INFO] [stdout] test test_tiny_mux ... ok
[INFO] [stdout] test unit_test_decode_mux ... ok
[INFO] [stdout] test test_real_mux ... ok
[INFO] [stdout] test test_sc3_mux ... ok
[INFO] [stdout] test test_med_mux ... ok
[INFO] [stdout] test test_balance_mux ... ok
[INFO] [stdout] test test_interleaved_mux ... ok
[INFO] [stdout] test test_long_mux ... ok
[INFO] [stdout] test test_3meg_mux ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests lepton-mux
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d7741c11270dd17cc70f1d3cc5bf039af9d81a0c5be9cc5b743e3adcc3ab7cab"`
[INFO] running `"docker" "rm" "-f" "d7741c11270dd17cc70f1d3cc5bf039af9d81a0c5be9cc5b743e3adcc3ab7cab"`
[INFO] [stdout] d7741c11270dd17cc70f1d3cc5bf039af9d81a0c5be9cc5b743e3adcc3ab7cab