[INFO] cloning repository https://github.com/Travispersson/word-counter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Travispersson/word-counter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTravispersson%2Fword-counter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTravispersson%2Fword-counter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8d06397a739c99b6c82b61b0d8cbc42c27061cb9
[INFO] checking Travispersson/word-counter against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTravispersson%2Fword-counter" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Travispersson/word-counter on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Travispersson/word-counter
[INFO] finished tweaking git repo https://github.com/Travispersson/word-counter
[INFO] tweaked toml for git repo https://github.com/Travispersson/word-counter written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/Travispersson/word-counter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2feb21560187fa4db953c3805a8ca9d01728e5c2aba7e36a9837ecf9b8e19b6f
[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" "2feb21560187fa4db953c3805a8ca9d01728e5c2aba7e36a9837ecf9b8e19b6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2feb21560187fa4db953c3805a8ca9d01728e5c2aba7e36a9837ecf9b8e19b6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2feb21560187fa4db953c3805a8ca9d01728e5c2aba7e36a9837ecf9b8e19b6f", kill_on_drop: false }`
[INFO] [stdout] 2feb21560187fa4db953c3805a8ca9d01728e5c2aba7e36a9837ecf9b8e19b6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 78bbf1c9dd5bff0e7971995b2226eaf42e2704f04e0ce8e4ec3c86f573352113
[INFO] running `Command { std: "docker" "start" "-a" "78bbf1c9dd5bff0e7971995b2226eaf42e2704f04e0ce8e4ec3c86f573352113", kill_on_drop: false }`
[INFO] [stderr]     Checking word_count v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             std::mem::replace(&mut self.buckets, new_buckets);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             std::mem::replace(&mut self.buckets, new_buckets);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `*ht` as mutable because it is also borrowed as immutable
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     if let Some(val) = ht.lookup(&w_string) {
[INFO] [stdout]   |                        -- immutable borrow occurs here
[INFO] [stdout] 9 |         ht.insert(w_string, val + 1);
[INFO] [stdout]   |         ^^                  --- immutable borrow later used here
[INFO] [stdout]   |         |
[INFO] [stdout]   |         mutable borrow occurs here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]   = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]   = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: cannot borrow `*ht` as mutable because it is also borrowed as immutable
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     if let Some(val) = ht.lookup(&w_string) {
[INFO] [stdout]   |                        -- immutable borrow occurs here
[INFO] [stdout] 9 |         ht.insert(w_string, val + 1);
[INFO] [stdout]   |         ^^                  --- immutable borrow later used here
[INFO] [stdout]   |         |
[INFO] [stdout]   |         mutable borrow occurs here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stdout]   = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stdout]   = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `remove`
[INFO] [stdout]   --> src/lib.rs:69:16
[INFO] [stdout]    |
[INFO] [stdout] 69 |         pub fn remove(&mut self, key: &K) -> Option<V> {
[INFO] [stdout]    |                ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `size`
[INFO] [stdout]    --> src/lib.rs:105:16
[INFO] [stdout]     |
[INFO] [stdout] 105 |         pub fn size(&self) -> usize {
[INFO] [stdout]     |                ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]    --> src/lib.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn is_empty(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]    --> src/lib.rs:109:16
[INFO] [stdout]     |
[INFO] [stdout] 109 |         pub fn is_empty(&self) -> bool {
[INFO] [stdout]     |                ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             std::mem::replace(&mut self.buckets, new_buckets);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> src/lib.rs:66:13
[INFO] [stdout]    |
[INFO] [stdout] 66 |             std::mem::replace(&mut self.buckets, new_buckets);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `Command { std: "docker" "inspect" "78bbf1c9dd5bff0e7971995b2226eaf42e2704f04e0ce8e4ec3c86f573352113", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78bbf1c9dd5bff0e7971995b2226eaf42e2704f04e0ce8e4ec3c86f573352113", kill_on_drop: false }`
[INFO] [stdout] 78bbf1c9dd5bff0e7971995b2226eaf42e2704f04e0ce8e4ec3c86f573352113