[INFO] updating cached repository hon/study_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/hon/study_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/hon/study_rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/hon/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/hon/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hon/study_rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] fd7f5c6e1dc451214c9990f6c839ac755c1709fb
[INFO] sha for GitHub repo hon/study_rust: fd7f5c6e1dc451214c9990f6c839ac755c1709fb
[INFO] validating manifest of hon/study_rust 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 hon/study_rust 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 hon/study_rust
[INFO] finished frobbing hon/study_rust
[INFO] frobbed toml for hon/study_rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/hon/study_rust/Cargo.toml
[INFO] started frobbing hon/study_rust
[INFO] finished frobbing hon/study_rust
[INFO] frobbed toml for hon/study_rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust/Cargo.toml
[INFO] crate hon/study_rust already has a lockfile, it will not be regenerated
[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 hon/study_rust 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-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust:/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] 77d4f98bf5628bb8f4c8b30fa8e2993b29e5d3ee161a33a6edfa226b53137977
[INFO] running `"docker" "start" "-a" "77d4f98bf5628bb8f4c8b30fa8e2993b29e5d3ee161a33a6edfa226b53137977"`
[INFO] [stderr]    Compiling study_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `consume`
[INFO] [stderr]   --> src/s_closure/mod.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |     let consume = || {
[INFO] [stderr]    |         ^^^^^^^ help: consider prefixing with an underscore: `_consume`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/s_mutability/mod.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut x = 5;
[INFO] [stderr]   |             ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "77d4f98bf5628bb8f4c8b30fa8e2993b29e5d3ee161a33a6edfa226b53137977"`
[INFO] running `"docker" "rm" "-f" "77d4f98bf5628bb8f4c8b30fa8e2993b29e5d3ee161a33a6edfa226b53137977"`
[INFO] [stdout] 77d4f98bf5628bb8f4c8b30fa8e2993b29e5d3ee161a33a6edfa226b53137977
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust:/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] a6310f281b96b2cd29993e41b76a19201095390a439ab276373f96d3264852da
[INFO] running `"docker" "start" "-a" "a6310f281b96b2cd29993e41b76a19201095390a439ab276373f96d3264852da"`
[INFO] [stderr]    Compiling study_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `consume`
[INFO] [stderr]   --> src/s_closure/mod.rs:61:9
[INFO] [stderr]    |
[INFO] [stderr] 61 |     let consume = || {
[INFO] [stderr]    |         ^^^^^^^ help: consider prefixing with an underscore: `_consume`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/s_mutability/mod.rs:9:13
[INFO] [stderr]   |
[INFO] [stderr] 9 |     let mut x = 5;
[INFO] [stderr]   |             ^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
[INFO] running `"docker" "inspect" "a6310f281b96b2cd29993e41b76a19201095390a439ab276373f96d3264852da"`
[INFO] running `"docker" "rm" "-f" "a6310f281b96b2cd29993e41b76a19201095390a439ab276373f96d3264852da"`
[INFO] [stdout] a6310f281b96b2cd29993e41b76a19201095390a439ab276373f96d3264852da
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/hon/study_rust:/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] 8671505263e8e64b07798a18196ec1ffe0d2e3627528dc3196776bfe6012d6e8
[INFO] running `"docker" "start" "-a" "8671505263e8e64b07798a18196ec1ffe0d2e3627528dc3196776bfe6012d6e8"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/study_rust-1795b20c3f4b704a
[INFO] [stderr]      Running /opt/crater/target/debug/deps/study_rust-65bd22a42b13c87f
[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] [stdout] 
[INFO] [stderr]    Doc-tests study_rust
[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] [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" "8671505263e8e64b07798a18196ec1ffe0d2e3627528dc3196776bfe6012d6e8"`
[INFO] running `"docker" "rm" "-f" "8671505263e8e64b07798a18196ec1ffe0d2e3627528dc3196776bfe6012d6e8"`
[INFO] [stdout] 8671505263e8e64b07798a18196ec1ffe0d2e3627528dc3196776bfe6012d6e8