[INFO] crate sink-splitter 0.1.0 is already in cache
[INFO] testing sink-splitter-0.1.0 against master#8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e for pr-74409
[INFO] extracting crate sink-splitter 0.1.0 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate sink-splitter 0.1.0 on toolchain 8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate sink-splitter 0.1.0
[INFO] finished tweaking crates.io crate sink-splitter 0.1.0
[INFO] tweaked toml for crates.io crate sink-splitter 0.1.0 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ba82d34e353982edfe12fd29320252cbad2636f8f159df18f76ade371340fa9a
[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" "ba82d34e353982edfe12fd29320252cbad2636f8f159df18f76ade371340fa9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ba82d34e353982edfe12fd29320252cbad2636f8f159df18f76ade371340fa9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba82d34e353982edfe12fd29320252cbad2636f8f159df18f76ade371340fa9a", kill_on_drop: false }`
[INFO] [stdout] ba82d34e353982edfe12fd29320252cbad2636f8f159df18f76ade371340fa9a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+8534be72fc3b9c5f2f2dc4e4ee7b651a008e9a3e" "build" "--frozen" "--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] 54f00f2ee9155049d0ca0fdc64d2ed2527190eb6d359a1f711da80f7a2b2b174
[INFO] running `Command { std: "docker" "start" "-a" "54f00f2ee9155049d0ca0fdc64d2ed2527190eb6d359a1f711da80f7a2b2b174", kill_on_drop: false }`
[INFO] [stderr]    Compiling sink-splitter v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:102:19
[INFO] [stdout]     |
[INFO] [stdout] 102 |         for (key, mut sink) in &mut self.inner.borrow_mut().sinks {
[INFO] [stdout]     |                   ----^^^^
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]    --> src/lib.rs:1:9
[INFO] [stdout]     |
[INFO] [stdout] 1   | #![deny(warnings)]
[INFO] [stdout]     |         ^^^^^^^^
[INFO] [stdout]     = note: `#[deny(unused_mut)]` implied by `#[deny(warnings)]`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:133:19
[INFO] [stdout]     |
[INFO] [stdout] 133 |         for (key, mut sink) in &mut self.inner.borrow_mut().sinks {
[INFO] [stdout]     |                   ----^^^^
[INFO] [stdout]     |                   |
[INFO] [stdout]     |                   help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `sink-splitter`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "54f00f2ee9155049d0ca0fdc64d2ed2527190eb6d359a1f711da80f7a2b2b174", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54f00f2ee9155049d0ca0fdc64d2ed2527190eb6d359a1f711da80f7a2b2b174", kill_on_drop: false }`
[INFO] [stdout] 54f00f2ee9155049d0ca0fdc64d2ed2527190eb6d359a1f711da80f7a2b2b174