[INFO] fetching crate unicode-trie 0.0.1...
[INFO] checking unicode-trie-0.0.1 against master#af3c6e733a40e671550e0f0f5aeecaa13772ba56 for pr-74989
[INFO] extracting crate unicode-trie 0.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate unicode-trie 0.0.1 on toolchain af3c6e733a40e671550e0f0f5aeecaa13772ba56
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unicode-trie 0.0.1
[INFO] finished tweaking crates.io crate unicode-trie 0.0.1
[INFO] tweaked toml for crates.io crate unicode-trie 0.0.1 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 2d83bcc830c5b49d218d27588bdfdfe4e48c56c1b4e2f9e68b3bfd85f6b2ddda
[INFO] running `Command { std: "docker" "start" "-a" "2d83bcc830c5b49d218d27588bdfdfe4e48c56c1b4e2f9e68b3bfd85f6b2ddda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d83bcc830c5b49d218d27588bdfdfe4e48c56c1b4e2f9e68b3bfd85f6b2ddda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d83bcc830c5b49d218d27588bdfdfe4e48c56c1b4e2f9e68b3bfd85f6b2ddda", kill_on_drop: false }`
[INFO] [stdout] 2d83bcc830c5b49d218d27588bdfdfe4e48c56c1b4e2f9e68b3bfd85f6b2ddda
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+af3c6e733a40e671550e0f0f5aeecaa13772ba56" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ed1ac2320647a551dc4b142e3b90ee207ca4d3478b125d7a26b484acf4dc5f4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3ed1ac2320647a551dc4b142e3b90ee207ca4d3478b125d7a26b484acf4dc5f4", kill_on_drop: false }`
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking unicode-trie v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:29:21
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[INFO] [stdout]    |                     ----^^^^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[INFO] [stdout]    |             ----^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:74:21
[INFO] [stdout]    |
[INFO] [stdout] 74 |                 let mut child = self.get_child_or_new(char);
[INFO] [stdout]    |                     ----^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:29:21
[INFO] [stdout]    |
[INFO] [stdout] 29 |                 let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[INFO] [stdout]    |                     ----^^^^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:40:13
[INFO] [stdout]    |
[INFO] [stdout] 40 |         let mut key_parts = UnicodeSegmentation::graphemes(key, true);
[INFO] [stdout]    |             ----^^^^^^^^^
[INFO] [stdout]    |             |
[INFO] [stdout]    |             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/lib.rs:74:21
[INFO] [stdout]    |
[INFO] [stdout] 74 |                 let mut child = self.get_child_or_new(char);
[INFO] [stdout]    |                     ----^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0463]: can't find crate for `trie`
[INFO] [stdout]  --> tests/all.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | extern crate trie;
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0463`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `unicode-trie`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "3ed1ac2320647a551dc4b142e3b90ee207ca4d3478b125d7a26b484acf4dc5f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ed1ac2320647a551dc4b142e3b90ee207ca4d3478b125d7a26b484acf4dc5f4", kill_on_drop: false }`
[INFO] [stdout] 3ed1ac2320647a551dc4b142e3b90ee207ca4d3478b125d7a26b484acf4dc5f4
