[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-1.38-1/sources/1.37.0/gh/hon/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/hon/study_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/hon/study_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/hon/study_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of hon/study_rust 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 hon/study_rust
[INFO] finished frobbing hon/study_rust
[INFO] frobbed toml for hon/study_rust written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 hon/study_rust against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 16488057deb8ff5392b83ecfb0931c396c38065264c826ef4b03faca37284270
[INFO] running `"docker" "start" "-a" "16488057deb8ff5392b83ecfb0931c396c38065264c826ef4b03faca37284270"`
[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 1.13s
[INFO] running `"docker" "inspect" "16488057deb8ff5392b83ecfb0931c396c38065264c826ef4b03faca37284270"`
[INFO] running `"docker" "rm" "-f" "16488057deb8ff5392b83ecfb0931c396c38065264c826ef4b03faca37284270"`
[INFO] [stdout] 16488057deb8ff5392b83ecfb0931c396c38065264c826ef4b03faca37284270
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 1ef6a39bd454f92e514a75b2b5b5b02996b40b3a197a4dd02b938ac1b5201764
[INFO] running `"docker" "start" "-a" "1ef6a39bd454f92e514a75b2b5b5b02996b40b3a197a4dd02b938ac1b5201764"`
[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 0.86s
[INFO] running `"docker" "inspect" "1ef6a39bd454f92e514a75b2b5b5b02996b40b3a197a4dd02b938ac1b5201764"`
[INFO] running `"docker" "rm" "-f" "1ef6a39bd454f92e514a75b2b5b5b02996b40b3a197a4dd02b938ac1b5201764"`
[INFO] [stdout] 1ef6a39bd454f92e514a75b2b5b5b02996b40b3a197a4dd02b938ac1b5201764
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 2474ab6015fe9ee8023edd0ab422d2f67e0a1a32ea774e077724d02f82c66473
[INFO] running `"docker" "start" "-a" "2474ab6015fe9ee8023edd0ab422d2f67e0a1a32ea774e077724d02f82c66473"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/study_rust-9a97c958df4a2b6e
[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]      Running /opt/crater/target/debug/deps/study_rust-a6d1f6f5e85a7e24
[INFO] [stdout] running 0 tests
[INFO] [stderr]    Doc-tests study_rust
[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" "2474ab6015fe9ee8023edd0ab422d2f67e0a1a32ea774e077724d02f82c66473"`
[INFO] running `"docker" "rm" "-f" "2474ab6015fe9ee8023edd0ab422d2f67e0a1a32ea774e077724d02f82c66473"`
[INFO] [stdout] 2474ab6015fe9ee8023edd0ab422d2f67e0a1a32ea774e077724d02f82c66473