[INFO] updating cached repository seb-odessa/btree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/seb-odessa/btree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/seb-odessa/btree" "work/ex/beta-1.37-6/sources/1.36.0/gh/seb-odessa/btree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/seb-odessa/btree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/seb-odessa/btree" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/seb-odessa/btree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/seb-odessa/btree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 144e85bd365c883245ced393f61305181fd9adf1
[INFO] sha for GitHub repo seb-odessa/btree: 144e85bd365c883245ced393f61305181fd9adf1
[INFO] validating manifest of seb-odessa/btree 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 seb-odessa/btree 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 seb-odessa/btree
[INFO] finished frobbing seb-odessa/btree
[INFO] frobbed toml for seb-odessa/btree written to work/ex/beta-1.37-6/sources/1.36.0/gh/seb-odessa/btree/Cargo.toml
[INFO] started frobbing seb-odessa/btree
[INFO] finished frobbing seb-odessa/btree
[INFO] frobbed toml for seb-odessa/btree written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/seb-odessa/btree/Cargo.toml
[INFO] crate seb-odessa/btree 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 seb-odessa/btree 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-5/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/seb-odessa/btree:/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] a54c271674015cae8ea14c56062cd7545f66060adc10598a8c316bf921eae4fa
[INFO] running `"docker" "start" "-a" "a54c271674015cae8ea14c56062cd7545f66060adc10598a8c316bf921eae4fa"`
[INFO] [stderr]    Compiling BTree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Formatter`
[INFO] [stderr]  --> src/main.rs:1:25
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::{Display, Formatter};
[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/main.rs:149:14
[INFO] [stderr]     |
[INFO] [stderr] 149 |         Some(mut node) => node.update("Z".to_string()),
[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: crate `BTree` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(non_snake_case)] on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `btree`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.46s
[INFO] running `"docker" "inspect" "a54c271674015cae8ea14c56062cd7545f66060adc10598a8c316bf921eae4fa"`
[INFO] running `"docker" "rm" "-f" "a54c271674015cae8ea14c56062cd7545f66060adc10598a8c316bf921eae4fa"`
[INFO] [stdout] a54c271674015cae8ea14c56062cd7545f66060adc10598a8c316bf921eae4fa
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/seb-odessa/btree:/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] 0260639329eeeb16985577b31d1a2530069e7d10c1643818f034d4ca172c7798
[INFO] running `"docker" "start" "-a" "0260639329eeeb16985577b31d1a2530069e7d10c1643818f034d4ca172c7798"`
[INFO] [stderr]    Compiling BTree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Formatter`
[INFO] [stderr]  --> src/main.rs:1:25
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::fmt::{Display, Formatter};
[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/main.rs:149:14
[INFO] [stderr]     |
[INFO] [stderr] 149 |         Some(mut node) => node.update("Z".to_string()),
[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: crate `BTree` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(non_snake_case)] on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `btree`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `"docker" "inspect" "0260639329eeeb16985577b31d1a2530069e7d10c1643818f034d4ca172c7798"`
[INFO] running `"docker" "rm" "-f" "0260639329eeeb16985577b31d1a2530069e7d10c1643818f034d4ca172c7798"`
[INFO] [stdout] 0260639329eeeb16985577b31d1a2530069e7d10c1643818f034d4ca172c7798
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-5/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/seb-odessa/btree:/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] 6f9510771fd061d1abdc44fb41b16f3a4f69796b81e635b1d917eabcf49bb6f5
[INFO] running `"docker" "start" "-a" "6f9510771fd061d1abdc44fb41b16f3a4f69796b81e635b1d917eabcf49bb6f5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/BTree-4f78704816e8894f
[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" "6f9510771fd061d1abdc44fb41b16f3a4f69796b81e635b1d917eabcf49bb6f5"`
[INFO] running `"docker" "rm" "-f" "6f9510771fd061d1abdc44fb41b16f3a4f69796b81e635b1d917eabcf49bb6f5"`
[INFO] [stdout] 6f9510771fd061d1abdc44fb41b16f3a4f69796b81e635b1d917eabcf49bb6f5