[INFO] updating cached repository JosephTLyons/prefix_tree
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/JosephTLyons/prefix_tree
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/JosephTLyons/prefix_tree" "work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JosephTLyons/prefix_tree" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephTLyons/prefix_tree"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephTLyons/prefix_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d4d1b50870efdca1d8233e658513bdd4d0c607f9
[INFO] sha for GitHub repo JosephTLyons/prefix_tree: d4d1b50870efdca1d8233e658513bdd4d0c607f9
[INFO] validating manifest of JosephTLyons/prefix_tree 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 JosephTLyons/prefix_tree 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 JosephTLyons/prefix_tree
[INFO] finished frobbing JosephTLyons/prefix_tree
[INFO] frobbed toml for JosephTLyons/prefix_tree written to work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree/Cargo.toml
[INFO] started frobbing JosephTLyons/prefix_tree
[INFO] finished frobbing JosephTLyons/prefix_tree
[INFO] frobbed toml for JosephTLyons/prefix_tree written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/JosephTLyons/prefix_tree/Cargo.toml
[INFO] crate JosephTLyons/prefix_tree 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 JosephTLyons/prefix_tree 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree:/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] 8ea44acf7191934570d92aa9ba9b790b896c1c9e75db91ad34a3e0dbf0cf4765
[INFO] running `"docker" "start" "-a" "8ea44acf7191934570d92aa9ba9b790b896c1c9e75db91ad34a3e0dbf0cf4765"`
[INFO] [stderr]    Compiling prefix_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `print_all_words_with_prefix`
[INFO] [stderr]   --> src/prefix_tree.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn print_all_words_with_prefix(&mut self, prefix: &str) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `contains_word`
[INFO] [stderr]    --> src/prefix_tree.rs:141:5
[INFO] [stderr]     |
[INFO] [stderr] 141 |     pub fn contains_word(&mut self, word: &str) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.22s
[INFO] running `"docker" "inspect" "8ea44acf7191934570d92aa9ba9b790b896c1c9e75db91ad34a3e0dbf0cf4765"`
[INFO] running `"docker" "rm" "-f" "8ea44acf7191934570d92aa9ba9b790b896c1c9e75db91ad34a3e0dbf0cf4765"`
[INFO] [stdout] 8ea44acf7191934570d92aa9ba9b790b896c1c9e75db91ad34a3e0dbf0cf4765
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree:/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] b089664abd23b163a624f6e790f797ff062a91ab094d8b3c98ff2dd1a23d20f6
[INFO] running `"docker" "start" "-a" "b089664abd23b163a624f6e790f797ff062a91ab094d8b3c98ff2dd1a23d20f6"`
[INFO] [stderr]    Compiling prefix_tree v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `print_all_words_with_prefix`
[INFO] [stderr]   --> src/prefix_tree.rs:81:5
[INFO] [stderr]    |
[INFO] [stderr] 81 |     pub fn print_all_words_with_prefix(&mut self, prefix: &str) {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `"docker" "inspect" "b089664abd23b163a624f6e790f797ff062a91ab094d8b3c98ff2dd1a23d20f6"`
[INFO] running `"docker" "rm" "-f" "b089664abd23b163a624f6e790f797ff062a91ab094d8b3c98ff2dd1a23d20f6"`
[INFO] [stdout] b089664abd23b163a624f6e790f797ff062a91ab094d8b3c98ff2dd1a23d20f6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/JosephTLyons/prefix_tree:/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] 34ce4ce6445e7a20d3a9443c211469cee2252d7206d53debc6e790cb2ffcde12
[INFO] running `"docker" "start" "-a" "34ce4ce6445e7a20d3a9443c211469cee2252d7206d53debc6e790cb2ffcde12"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/prefix_tree-90f9b7447f7e6b23
[INFO] [stdout] 
[INFO] [stdout] running 8 tests
[INFO] [stdout] test prefix_tree::tests::get_word_count_test_3 ... ok
[INFO] [stdout] test prefix_tree::tests::get_word_count_test_2 ... ok
[INFO] [stdout] test prefix_tree::tests::get_letter_count_test_2 ... ok
[INFO] [stdout] test prefix_tree::tests::get_letter_count_test_1 ... ok
[INFO] [stdout] test prefix_tree::tests::contains_word_test_1 ... ok
[INFO] [stdout] test prefix_tree::tests::get_word_count_test_1 ... ok
[INFO] [stdout] test prefix_tree::tests::contains_word_test_2 ... ok
[INFO] [stdout] test prefix_tree::tests::contains_word_test_3 ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 8 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "34ce4ce6445e7a20d3a9443c211469cee2252d7206d53debc6e790cb2ffcde12"`
[INFO] running `"docker" "rm" "-f" "34ce4ce6445e7a20d3a9443c211469cee2252d7206d53debc6e790cb2ffcde12"`
[INFO] [stdout] 34ce4ce6445e7a20d3a9443c211469cee2252d7206d53debc6e790cb2ffcde12