[INFO] updating cached repository wjh/zif_log
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/wjh/zif_log
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/wjh/zif_log" "work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/wjh/zif_log" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wjh/zif_log"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wjh/zif_log'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 07461b8e984252c0ba4f8a7ab19d41c7467a8ec0
[INFO] sha for GitHub repo wjh/zif_log: 07461b8e984252c0ba4f8a7ab19d41c7467a8ec0
[INFO] validating manifest of wjh/zif_log 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 wjh/zif_log 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 wjh/zif_log
[INFO] finished frobbing wjh/zif_log
[INFO] frobbed toml for wjh/zif_log written to work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log/Cargo.toml
[INFO] started frobbing wjh/zif_log
[INFO] finished frobbing wjh/zif_log
[INFO] frobbed toml for wjh/zif_log written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/wjh/zif_log/Cargo.toml
[INFO] crate wjh/zif_log 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 wjh/zif_log against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 599487249de4e8d42992e77c462b1264cec50904789c355acd372b8442e1cd12
[INFO] running `"docker" "start" "-a" "599487249de4e8d42992e77c462b1264cec50904789c355acd372b8442e1cd12"`
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling rayon-core v1.3.0
[INFO] [stderr]    Compiling untrusted v0.5.1
[INFO] [stderr]    Compiling bufstream v0.1.3
[INFO] [stderr]    Compiling num_cpus v1.7.0
[INFO] [stderr]    Compiling arrayvec v0.4.6
[INFO] [stderr]    Compiling coco v0.1.1
[INFO] [stderr]    Compiling blake2-rfc v0.2.18
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling ring v0.12.1
[INFO] [stderr]    Compiling zif_log v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/log.rs:2:21
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/log.rs:84:31
[INFO] [stderr]    |
[INFO] [stderr] 84 |     pub fn read(read: &mut T, mut internal: T) -> Result<Log<T>, error::Error> {
[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 19.75s
[INFO] running `"docker" "inspect" "599487249de4e8d42992e77c462b1264cec50904789c355acd372b8442e1cd12"`
[INFO] running `"docker" "rm" "-f" "599487249de4e8d42992e77c462b1264cec50904789c355acd372b8442e1cd12"`
[INFO] [stdout] 599487249de4e8d42992e77c462b1264cec50904789c355acd372b8442e1cd12
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] cf63dc2a6acc18a9bd19d89a173460661992b135130022b37a576483379c79bc
[INFO] running `"docker" "start" "-a" "cf63dc2a6acc18a9bd19d89a173460661992b135130022b37a576483379c79bc"`
[INFO] [stderr]    Compiling zif_log v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `OpenOptions`
[INFO] [stderr]  --> src/log.rs:2:21
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::fs::{File, OpenOptions};
[INFO] [stderr]   |                     ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `pos` is never read
[INFO] [stderr]   --> src/lib.rs:51:9
[INFO] [stderr]    |
[INFO] [stderr] 51 |         pos += 8;
[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] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |         let mut vec = Vec::with_capacity(1024);
[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] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |         let mut vec = Vec::with_capacity(1024);
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:65:13
[INFO] [stderr]    |
[INFO] [stderr] 65 |         let mut vec = Vec::with_capacity(1024);
[INFO] [stderr]    |             ----^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:67:13
[INFO] [stderr]    |
[INFO] [stderr] 67 |         let mut log_read = Log::read(&mut log.internal, file).unwrap();
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/log.rs:84:31
[INFO] [stderr]    |
[INFO] [stderr] 84 |     pub fn read(read: &mut T, mut internal: T) -> Result<Log<T>, error::Error> {
[INFO] [stderr]    |                               ----^^^^^^^^
[INFO] [stderr]    |                               |
[INFO] [stderr]    |                               help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.23s
[INFO] running `"docker" "inspect" "cf63dc2a6acc18a9bd19d89a173460661992b135130022b37a576483379c79bc"`
[INFO] running `"docker" "rm" "-f" "cf63dc2a6acc18a9bd19d89a173460661992b135130022b37a576483379c79bc"`
[INFO] [stdout] cf63dc2a6acc18a9bd19d89a173460661992b135130022b37a576483379c79bc
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/wjh/zif_log:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 100728bd481f0315766e63efb3765dc86edead1ea9abec955a7fda02b40d3e37
[INFO] running `"docker" "start" "-a" "100728bd481f0315766e63efb3765dc86edead1ea9abec955a7fda02b40d3e37"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/zif_log-8ef428c5b75425db
[INFO] [stderr]    Doc-tests zif_log
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::test_log_read ... ok
[INFO] [stdout] test tests::test_log_write ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 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" "100728bd481f0315766e63efb3765dc86edead1ea9abec955a7fda02b40d3e37"`
[INFO] running `"docker" "rm" "-f" "100728bd481f0315766e63efb3765dc86edead1ea9abec955a7fda02b40d3e37"`
[INFO] [stdout] 100728bd481f0315766e63efb3765dc86edead1ea9abec955a7fda02b40d3e37