[INFO] cloning repository https://github.com/krlvi/wc-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/krlvi/wc-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrlvi%2Fwc-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrlvi%2Fwc-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b89da8176c9215a7ec0ca69d1f418ca06808e901
[INFO] checking krlvi/wc-rs against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkrlvi%2Fwc-rs" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/krlvi/wc-rs on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/krlvi/wc-rs
[INFO] finished tweaking git repo https://github.com/krlvi/wc-rs
[INFO] tweaked toml for git repo https://github.com/krlvi/wc-rs written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/krlvi/wc-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "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] 50a8b1cad8495ee7065856c679a3624ce46e72d5405f87fcbf8d32e4f749a813
[INFO] running `Command { std: "docker" "start" "-a" "50a8b1cad8495ee7065856c679a3624ce46e72d5405f87fcbf8d32e4f749a813", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50a8b1cad8495ee7065856c679a3624ce46e72d5405f87fcbf8d32e4f749a813", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50a8b1cad8495ee7065856c679a3624ce46e72d5405f87fcbf8d32e4f749a813", kill_on_drop: false }`
[INFO] [stdout] 50a8b1cad8495ee7065856c679a3624ce46e72d5405f87fcbf8d32e4f749a813
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e1430c8d6fc3dfd29911e5da2c7836c23a1f9163843997fba361861e4341af3
[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" "9e1430c8d6fc3dfd29911e5da2c7836c23a1f9163843997fba361861e4341af3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking hashbrown v0.3.0
[INFO] [stderr]     Checking spmc v0.2.2
[INFO] [stderr]     Checking wc-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: cannot borrow `dict` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:19:29
[INFO] [stdout]    |
[INFO] [stdout] 18 |                         if let Some(val) = dict.get(word) {
[INFO] [stdout]    |                                            ---- immutable borrow occurs here
[INFO] [stdout] 19 |                             dict.insert(String::from(word), *val + 1);
[INFO] [stdout]    |                             ^^^^ mutable borrow occurs here ---- immutable borrow later used 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 `dict` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:19:29
[INFO] [stdout]    |
[INFO] [stdout] 18 |                         if let Some(val) = dict.get(word) {
[INFO] [stdout]    |                                            ---- immutable borrow occurs here
[INFO] [stdout] 19 |                             dict.insert(String::from(word), *val + 1);
[INFO] [stdout]    |                             ^^^^ mutable borrow occurs here ---- immutable borrow later used 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 `re` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:64:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |             match re.get(&k) {
[INFO] [stdout]    |                   -- immutable borrow occurs here
[INFO] [stdout] 63 |                 Some(ev) => {
[INFO] [stdout] 64 |                     re.insert(k, ev + v);
[INFO] [stdout]    |                     ^^           -- immutable borrow later used here
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     mutable borrow occurs here
[INFO] [stdout]    |
[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 `re` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:64:21
[INFO] [stdout]    |
[INFO] [stdout] 62 |             match re.get(&k) {
[INFO] [stdout]    |                   -- immutable borrow occurs here
[INFO] [stdout] 63 |                 Some(ev) => {
[INFO] [stdout] 64 |                     re.insert(k, ev + v);
[INFO] [stdout]    |                     ^^           -- immutable borrow later used here
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     mutable borrow occurs here
[INFO] [stdout]    |
[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: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.44s
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "9e1430c8d6fc3dfd29911e5da2c7836c23a1f9163843997fba361861e4341af3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e1430c8d6fc3dfd29911e5da2c7836c23a1f9163843997fba361861e4341af3", kill_on_drop: false }`
[INFO] [stdout] 9e1430c8d6fc3dfd29911e5da2c7836c23a1f9163843997fba361861e4341af3