[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/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/JosephTLyons/prefix_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/gh/JosephTLyons/prefix_tree'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/JosephTLyons/prefix_tree" "work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/gh/JosephTLyons/prefix_tree"`
[INFO] [stderr] Cloning into 'work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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 master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of JosephTLyons/prefix_tree on toolchain try#18481b65f318e0b4b20c0fc61340054701719d6c
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "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/pr-62507/sources/master#78ca1bda3522b14bc0336bc01dd1d49fdba2cda7/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/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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" "+78ca1bda3522b14bc0336bc01dd1d49fdba2cda7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking JosephTLyons/prefix_tree against try#18481b65f318e0b4b20c0fc61340054701719d6c for pr-62507
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62507/worker-3/try#18481b65f318e0b4b20c0fc61340054701719d6c:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62507/sources/try#18481b65f318e0b4b20c0fc61340054701719d6c/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=forbid" "-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" "+18481b65f318e0b4b20c0fc61340054701719d6c-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 02f54533b1ced2d43d6845d7659ea1d2a214b9d6b20c52cb7d3125e7ddc83ab9
[INFO] running `"docker" "start" "-a" "02f54533b1ced2d43d6845d7659ea1d2a214b9d6b20c52cb7d3125e7ddc83ab9"`
[INFO] [stderr]     Checking 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] 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 0.42s
[INFO] running `"docker" "inspect" "02f54533b1ced2d43d6845d7659ea1d2a214b9d6b20c52cb7d3125e7ddc83ab9"`
[INFO] running `"docker" "rm" "-f" "02f54533b1ced2d43d6845d7659ea1d2a214b9d6b20c52cb7d3125e7ddc83ab9"`
[INFO] [stdout] 02f54533b1ced2d43d6845d7659ea1d2a214b9d6b20c52cb7d3125e7ddc83ab9