[INFO] crate unicode-trie 0.0.1 is already in cache
[INFO] extracting crate unicode-trie 0.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/unicode-trie/0.0.1
[INFO] extracting crate unicode-trie 0.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/unicode-trie/0.0.1
[INFO] validating manifest of unicode-trie-0.0.1 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 unicode-trie-0.0.1 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 unicode-trie-0.0.1
[INFO] finished frobbing unicode-trie-0.0.1
[INFO] frobbed toml for unicode-trie-0.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/unicode-trie/0.0.1/Cargo.toml
[INFO] started frobbing unicode-trie-0.0.1
[INFO] finished frobbing unicode-trie-0.0.1
[INFO] frobbed toml for unicode-trie-0.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/unicode-trie/0.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 unicode-trie-0.0.1 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/unicode-trie/0.0.1:/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] 66b5f85221ae76994b61b617a379069df00daf06e7db6b3700d3c70bb6b89c9d
[INFO] running `"docker" "start" "-a" "66b5f85221ae76994b61b617a379069df00daf06e7db6b3700d3c70bb6b89c9d"`
[INFO] [stderr]    Compiling unicode-trie v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:29:21
[INFO] [stderr]    |
[INFO] [stderr] 29 |                 let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[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:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[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:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 let mut child = self.get_child_or_new(char);
[INFO] [stderr]    |                     ----^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `"docker" "inspect" "66b5f85221ae76994b61b617a379069df00daf06e7db6b3700d3c70bb6b89c9d"`
[INFO] running `"docker" "rm" "-f" "66b5f85221ae76994b61b617a379069df00daf06e7db6b3700d3c70bb6b89c9d"`
[INFO] [stdout] 66b5f85221ae76994b61b617a379069df00daf06e7db6b3700d3c70bb6b89c9d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/unicode-trie/0.0.1:/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] 9cb2a4504db2eb325ed739f98e3ea145400acac544a7e2e9921c0356102d3bc1
[INFO] running `"docker" "start" "-a" "9cb2a4504db2eb325ed739f98e3ea145400acac544a7e2e9921c0356102d3bc1"`
[INFO] [stderr]    Compiling unicode-trie v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0463]: can't find crate for `trie`
[INFO] [stderr]  --> tests/all.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | extern crate trie;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `unicode-trie`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/lib.rs:29:21
[INFO] [stderr]    |
[INFO] [stderr] 29 |                 let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[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:40:13
[INFO] [stderr]    |
[INFO] [stderr] 40 |         let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[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:74:21
[INFO] [stderr]    |
[INFO] [stderr] 74 |                 let mut child = self.get_child_or_new(char);
[INFO] [stderr]    |                     ----^^^^^
[INFO] [stderr]    |                     |
[INFO] [stderr]    |                     help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "9cb2a4504db2eb325ed739f98e3ea145400acac544a7e2e9921c0356102d3bc1"`
[INFO] running `"docker" "rm" "-f" "9cb2a4504db2eb325ed739f98e3ea145400acac544a7e2e9921c0356102d3bc1"`
[INFO] [stdout] 9cb2a4504db2eb325ed739f98e3ea145400acac544a7e2e9921c0356102d3bc1