Dec 18 18:18:27.560 INFO checking balloon-0.0.1 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 18:18:27.560 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-4/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/balloon/0.0.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 18:18:27.823 INFO [stdout] b9b6094815c68c5280f67ddd7b06cbc86a19d3a92c902be999101ad604d9cf48
Dec 18 18:18:27.825 INFO running `"docker" "start" "-a" "b9b6094815c68c5280f67ddd7b06cbc86a19d3a92c902be999101ad604d9cf48"`
Dec 18 18:18:28.472 INFO [stderr]     Checking subtle v0.7.1
Dec 18 18:18:28.801 INFO [stderr]     Checking balloon v0.0.1 (/opt/crater/workdir)
Dec 18 18:18:29.212 INFO [stderr] warning: method is never used: `get`
Dec 18 18:18:29.212 INFO [stderr]   --> src/buffer.rs:51:5
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr] 51 |     pub fn get(&self, index: usize) -> Option<&T> { self.back.get(index) }
Dec 18 18:18:29.212 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 18:18:29.212 INFO [stderr] 
Dec 18 18:18:29.212 INFO [stderr] warning: method is never used: `get_mut`
Dec 18 18:18:29.212 INFO [stderr]   --> src/buffer.rs:54:5
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr] 54 |     pub fn get_mut(&mut self, index: usize) -> Option<&mut T> { self.back.get_mut(index) }
Dec 18 18:18:29.212 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.212 INFO [stderr] 
Dec 18 18:18:29.212 INFO [stderr] warning: method is never used: `clear`
Dec 18 18:18:29.212 INFO [stderr]   --> src/buffer.rs:57:5
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr] 57 |     pub fn clear(&mut self) { self.back.clear() }
Dec 18 18:18:29.212 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.212 INFO [stderr] 
Dec 18 18:18:29.212 INFO [stderr] warning: method is never used: `is_empty`
Dec 18 18:18:29.212 INFO [stderr]   --> src/buffer.rs:58:5
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr] 58 |     pub fn is_empty(&self) -> bool { self.back.is_empty() }
Dec 18 18:18:29.212 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.212 INFO [stderr] 
Dec 18 18:18:29.212 INFO [stderr] warning: method is never used: `len`
Dec 18 18:18:29.212 INFO [stderr]   --> src/buffer.rs:59:5
Dec 18 18:18:29.212 INFO [stderr]    |
Dec 18 18:18:29.212 INFO [stderr] 59 |     pub fn len(&self) -> usize { self.back.len() }
Dec 18 18:18:29.212 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.212 INFO [stderr] 
Dec 18 18:18:29.233 INFO [stderr] warning: method is never used: `get`
Dec 18 18:18:29.233 INFO [stderr]   --> src/buffer.rs:51:5
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr] 51 |     pub fn get(&self, index: usize) -> Option<&T> { self.back.get(index) }
Dec 18 18:18:29.233 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 18 18:18:29.233 INFO [stderr] 
Dec 18 18:18:29.233 INFO [stderr] warning: method is never used: `get_mut`
Dec 18 18:18:29.233 INFO [stderr]   --> src/buffer.rs:54:5
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr] 54 |     pub fn get_mut(&mut self, index: usize) -> Option<&mut T> { self.back.get_mut(index) }
Dec 18 18:18:29.233 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.233 INFO [stderr] 
Dec 18 18:18:29.233 INFO [stderr] warning: method is never used: `clear`
Dec 18 18:18:29.233 INFO [stderr]   --> src/buffer.rs:57:5
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr] 57 |     pub fn clear(&mut self) { self.back.clear() }
Dec 18 18:18:29.233 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.233 INFO [stderr] 
Dec 18 18:18:29.233 INFO [stderr] warning: method is never used: `is_empty`
Dec 18 18:18:29.233 INFO [stderr]   --> src/buffer.rs:58:5
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr] 58 |     pub fn is_empty(&self) -> bool { self.back.is_empty() }
Dec 18 18:18:29.233 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.233 INFO [stderr] 
Dec 18 18:18:29.233 INFO [stderr] warning: method is never used: `len`
Dec 18 18:18:29.233 INFO [stderr]   --> src/buffer.rs:59:5
Dec 18 18:18:29.233 INFO [stderr]    |
Dec 18 18:18:29.233 INFO [stderr] 59 |     pub fn len(&self) -> usize { self.back.len() }
Dec 18 18:18:29.233 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 18:18:29.233 INFO [stderr] 
Dec 18 18:18:29.254 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.81s
Dec 18 18:18:29.474 INFO running `"docker" "inspect" "b9b6094815c68c5280f67ddd7b06cbc86a19d3a92c902be999101ad604d9cf48"`
Dec 18 18:18:29.536 INFO running `"docker" "rm" "-f" "b9b6094815c68c5280f67ddd7b06cbc86a19d3a92c902be999101ad604d9cf48"`
Dec 18 18:18:29.660 INFO [stdout] b9b6094815c68c5280f67ddd7b06cbc86a19d3a92c902be999101ad604d9cf48