Dec 11 18:52:37.850 INFO checking erikjohnston/synapse-find-unreferenced-state-groups against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 18:52:37.850 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 18:52:38.412 INFO [stdout] 3883479ff907dbbb48d1b3486c78fa72554e313455718048a9509f3f5dbaf75a
Dec 11 18:52:38.414 INFO running `"docker" "start" "-a" "3883479ff907dbbb48d1b3486c78fa72554e313455718048a9509f3f5dbaf75a"`
Dec 11 18:52:39.892 INFO [stderr] usermod: no changes
Dec 11 18:52:40.228 INFO [stderr]     Checking postgres-protocol v0.3.2
Dec 11 18:52:42.576 INFO [stderr]     Checking postgres-shared v0.4.2
Dec 11 18:52:45.016 INFO [stderr]     Checking postgres v0.15.2
Dec 11 18:52:47.114 INFO [stderr]     Checking rust-synapse-find-unreferenced-state-groups v0.1.0 (/source)
Dec 11 18:52:52.136 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 11 18:52:52.136 INFO [stderr]    --> src/main.rs:252:17
Dec 11 18:52:52.136 INFO [stderr]     |
Dec 11 18:52:52.137 INFO [stderr] 252 |                 writeln!(fs, "{}", state_group);
Dec 11 18:52:52.137 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 18:52:52.137 INFO [stderr]     |
Dec 11 18:52:52.137 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 11 18:52:52.137 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 11 18:52:52.137 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 11 18:52:52.137 INFO [stderr] 
Dec 11 18:52:52.164 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 11 18:52:52.164 INFO [stderr]    --> src/main.rs:252:17
Dec 11 18:52:52.165 INFO [stderr]     |
Dec 11 18:52:52.165 INFO [stderr] 252 |                 writeln!(fs, "{}", state_group);
Dec 11 18:52:52.165 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 18:52:52.165 INFO [stderr]     |
Dec 11 18:52:52.166 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 11 18:52:52.166 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 11 18:52:52.166 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 11 18:52:52.166 INFO [stderr] 
Dec 11 18:52:52.231 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.32s
Dec 11 18:52:52.249 INFO [stderr] su: No module specific data is present
Dec 11 18:52:53.682 INFO running `"docker" "inspect" "3883479ff907dbbb48d1b3486c78fa72554e313455718048a9509f3f5dbaf75a"`
Dec 11 18:52:54.000 INFO running `"docker" "rm" "-f" "3883479ff907dbbb48d1b3486c78fa72554e313455718048a9509f3f5dbaf75a"`
Dec 11 18:52:54.318 INFO [stdout] 3883479ff907dbbb48d1b3486c78fa72554e313455718048a9509f3f5dbaf75a