[INFO] updating cached repository dharasim/semiring
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dharasim/semiring
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dharasim/semiring" "work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dharasim/semiring" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dharasim/semiring"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dharasim/semiring'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 083888f34902e96474ca3b7da781dcbec8a1ff35
[INFO] sha for GitHub repo dharasim/semiring: 083888f34902e96474ca3b7da781dcbec8a1ff35
[INFO] validating manifest of dharasim/semiring 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 dharasim/semiring 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 dharasim/semiring
[INFO] finished frobbing dharasim/semiring
[INFO] frobbed toml for dharasim/semiring written to work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring/Cargo.toml
[INFO] started frobbing dharasim/semiring
[INFO] finished frobbing dharasim/semiring
[INFO] frobbed toml for dharasim/semiring written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dharasim/semiring/Cargo.toml
[INFO] crate dharasim/semiring 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing dharasim/semiring 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring:/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] 866d8215edc8021df2d244e9f42f9b5ed586045bb0eae90bc3a6ef8564f219e2
[INFO] running `"docker" "start" "-a" "866d8215edc8021df2d244e9f42f9b5ed586045bb0eae90bc3a6ef8564f219e2"`
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling rust_stuff v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `eval`
[INFO] [stderr]   --> src/main.rs:83:13
[INFO] [stderr]    |
[INFO] [stderr] 83 | /             pub fn eval<S, F>(&self, f: &F) -> S
[INFO] [stderr] 84 | |             where
[INFO] [stderr] 85 | |                 S: Semiring,
[INFO] [stderr] 86 | |                 F: Fn(T) -> S,
[INFO] [stderr] ...  |
[INFO] [stderr] 94 | |                 }
[INFO] [stderr] 95 | |             }
[INFO] [stderr]    | |_____________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `bernoulli`
[INFO] [stderr]    --> src/main.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |         fn bernoulli(p: f64) -> bool {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sample`
[INFO] [stderr]    --> src/main.rs:198:13
[INFO] [stderr]     |
[INFO] [stderr] 198 |             pub fn sample(&self) -> Result<Vec<T>, String> {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sample_and_push_to`
[INFO] [stderr]    --> src/main.rs:203:13
[INFO] [stderr]     |
[INFO] [stderr] 203 |             fn sample_and_push_to(&self, ts: &mut Vec<T>) -> Result<(), String> {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.77s
[INFO] running `"docker" "inspect" "866d8215edc8021df2d244e9f42f9b5ed586045bb0eae90bc3a6ef8564f219e2"`
[INFO] running `"docker" "rm" "-f" "866d8215edc8021df2d244e9f42f9b5ed586045bb0eae90bc3a6ef8564f219e2"`
[INFO] [stdout] 866d8215edc8021df2d244e9f42f9b5ed586045bb0eae90bc3a6ef8564f219e2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring:/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] 7b2be2c129c6cce64416b7130341c86e6b27666b626bda1c01708af75f9b551d
[INFO] running `"docker" "start" "-a" "7b2be2c129c6cce64416b7130341c86e6b27666b626bda1c01708af75f9b551d"`
[INFO] [stderr]    Compiling rust_stuff v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `bernoulli`
[INFO] [stderr]    --> src/main.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |         fn bernoulli(p: f64) -> bool {
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sample`
[INFO] [stderr]    --> src/main.rs:198:13
[INFO] [stderr]     |
[INFO] [stderr] 198 |             pub fn sample(&self) -> Result<Vec<T>, String> {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `sample_and_push_to`
[INFO] [stderr]    --> src/main.rs:203:13
[INFO] [stderr]     |
[INFO] [stderr] 203 |             fn sample_and_push_to(&self, ts: &mut Vec<T>) -> Result<(), String> {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `"docker" "inspect" "7b2be2c129c6cce64416b7130341c86e6b27666b626bda1c01708af75f9b551d"`
[INFO] running `"docker" "rm" "-f" "7b2be2c129c6cce64416b7130341c86e6b27666b626bda1c01708af75f9b551d"`
[INFO] [stdout] 7b2be2c129c6cce64416b7130341c86e6b27666b626bda1c01708af75f9b551d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/dharasim/semiring:/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] 0eb2fe949d1ed5cd558fbc0db5cf283ea09d2b778a12c9551191fab7aea9409d
[INFO] running `"docker" "start" "-a" "0eb2fe949d1ed5cd558fbc0db5cf283ea09d2b778a12c9551191fab7aea9409d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_stuff-2fbac983233fda23
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test semiring::free::tests::free_semiring ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "0eb2fe949d1ed5cd558fbc0db5cf283ea09d2b778a12c9551191fab7aea9409d"`
[INFO] running `"docker" "rm" "-f" "0eb2fe949d1ed5cd558fbc0db5cf283ea09d2b778a12c9551191fab7aea9409d"`
[INFO] [stdout] 0eb2fe949d1ed5cd558fbc0db5cf283ea09d2b778a12c9551191fab7aea9409d