[INFO] fetching crate balloon 0.0.4...
[INFO] extracting crate balloon 0.0.4 into work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/balloon/0.0.4
[INFO] extracting crate balloon 0.0.4 into work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/reg/balloon/0.0.4
[INFO] validating manifest of balloon-0.0.4 on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of balloon-0.0.4 on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing balloon-0.0.4
[INFO] finished frobbing balloon-0.0.4
[INFO] frobbed toml for balloon-0.0.4 written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/balloon/0.0.4/Cargo.toml
[INFO] started frobbing balloon-0.0.4
[INFO] finished frobbing balloon-0.0.4
[INFO] frobbed toml for balloon-0.0.4 written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/reg/balloon/0.0.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mohan v0.0.1
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking balloon-0.0.4 against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-0/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/reg/balloon/0.0.4:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] cc3f57bde979b159a2e5457dd60e5778dda811534a4f07dff22ccffb0fcd7ba6
[INFO] running `"docker" "start" "-a" "cc3f57bde979b159a2e5457dd60e5778dda811534a4f07dff22ccffb0fcd7ba6"`
[INFO] [stderr]     Checking elapsed v0.1.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]     Checking blake2b_simd v0.5.3
[INFO] [stderr]     Checking uint v0.6.1
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking merlin v1.1.0
[INFO] [stderr]     Checking rand_xoshiro v0.1.0
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking criterion v0.2.11
[INFO] [stderr]     Checking fixed-hash v0.3.2
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking mohan v0.0.1
[INFO] [stderr]     Checking balloon v0.0.4 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/buffer.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn get(&self, index: usize) -> Option<&T> { self.back.get(index) }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]   --> src/buffer.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn get_mut(&mut self, index: usize) -> Option<&mut T> { self.back.get_mut(index) }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `clear`
[INFO] [stderr]   --> src/buffer.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 |     pub fn clear(&mut self) { self.back.clear() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/buffer.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn is_empty(&self) -> bool { self.back.is_empty() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `len`
[INFO] [stderr]   --> src/buffer.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn len(&self) -> usize { self.back.len() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get`
[INFO] [stderr]   --> src/buffer.rs:39:5
[INFO] [stderr]    |
[INFO] [stderr] 39 |     pub fn get(&self, index: usize) -> Option<&T> { self.back.get(index) }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_mut`
[INFO] [stderr]   --> src/buffer.rs:42:5
[INFO] [stderr]    |
[INFO] [stderr] 42 |     pub fn get_mut(&mut self, index: usize) -> Option<&mut T> { self.back.get_mut(index) }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `clear`
[INFO] [stderr]   --> src/buffer.rs:45:5
[INFO] [stderr]    |
[INFO] [stderr] 45 |     pub fn clear(&mut self) { self.back.clear() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_empty`
[INFO] [stderr]   --> src/buffer.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn is_empty(&self) -> bool { self.back.is_empty() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `len`
[INFO] [stderr]   --> src/buffer.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 47 |     pub fn len(&self) -> usize { self.back.len() }
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.69s
[INFO] running `"docker" "inspect" "cc3f57bde979b159a2e5457dd60e5778dda811534a4f07dff22ccffb0fcd7ba6"`
[INFO] running `"docker" "rm" "-f" "cc3f57bde979b159a2e5457dd60e5778dda811534a4f07dff22ccffb0fcd7ba6"`
[INFO] [stdout] cc3f57bde979b159a2e5457dd60e5778dda811534a4f07dff22ccffb0fcd7ba6