[INFO] updating cached repository acsearle/barc
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/acsearle/barc
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/acsearle/barc" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/acsearle/barc"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/acsearle/barc'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/acsearle/barc" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/acsearle/barc"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/acsearle/barc'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ac9704cb2df0b1c432d243c0f277870e331b90db
[INFO] sha for GitHub repo acsearle/barc: ac9704cb2df0b1c432d243c0f277870e331b90db
[INFO] validating manifest of acsearle/barc on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of acsearle/barc on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing acsearle/barc
[INFO] finished frobbing acsearle/barc
[INFO] frobbed toml for acsearle/barc written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/acsearle/barc/Cargo.toml
[INFO] started frobbing acsearle/barc
[INFO] finished frobbing acsearle/barc
[INFO] frobbed toml for acsearle/barc written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/acsearle/barc/Cargo.toml
[INFO] crate acsearle/barc already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking acsearle/barc against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-1/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/acsearle/barc:/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" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 51c763b73412e9a38e1494a7a1b93e6b54a39363bc8c751971cd4198e66f698a
[INFO] running `"docker" "start" "-a" "51c763b73412e9a38e1494a7a1b93e6b54a39363bc8c751971cd4198e66f698a"`
[INFO] [stderr]     Checking barc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `nest`
[INFO] [stderr]     --> src/lib.rs:2223:17
[INFO] [stderr]      |
[INFO] [stderr] 2223 |             let nest = Nest::new();
[INFO] [stderr]      |                 ^^^^ help: consider prefixing with an underscore: `_nest`
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]     --> src/lib.rs:2281:17
[INFO] [stderr]      |
[INFO] [stderr] 2281 |             let b = a.clone();
[INFO] [stderr]      |                 ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]     --> src/lib.rs:2283:17
[INFO] [stderr]      |
[INFO] [stderr] 2283 |             let c = WeightedArc::downgrade(&a);
[INFO] [stderr]      |                 ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]     --> src/lib.rs:2303:21
[INFO] [stderr]      |
[INFO] [stderr] 2303 |             let mut b = a.clone();
[INFO] [stderr]      |                     ^ help: consider prefixing with an underscore: `_b`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]     --> src/lib.rs:2319:17
[INFO] [stderr]      |
[INFO] [stderr] 2319 |             let a = AtomicOptionWeightedArc::new(Some(WeightedArc::new(nest.hatch(99))));
[INFO] [stderr]      |                 ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set`
[INFO] [stderr]    --> src/lib.rs:167:5
[INFO] [stderr]     |
[INFO] [stderr] 167 |     fn set(&mut self, count: usize, pointer: *mut T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_ptr`
[INFO] [stderr]    --> src/lib.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |     fn set_ptr(&mut self, pointer: *mut T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_ref`
[INFO] [stderr]    --> src/lib.rs:191:5
[INFO] [stderr]     |
[INFO] [stderr] 191 |     unsafe fn as_ref(&self) -> &T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_mut`
[INFO] [stderr]    --> src/lib.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 195 |     unsafe fn as_mut(&mut self) -> &mut T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_ptr`
[INFO] [stderr]    --> src/lib.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     fn get_ptr(&self) -> *mut T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_ptr`
[INFO] [stderr]    --> src/lib.rs:287:5
[INFO] [stderr]     |
[INFO] [stderr] 287 |     fn set_ptr(&mut self, pointer: NonNull<T>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `into_inner`
[INFO] [stderr]    --> src/lib.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     fn into_inner(self) -> CountedPtr<T> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `store`
[INFO] [stderr]    --> src/lib.rs:362:5
[INFO] [stderr]     |
[INFO] [stderr] 362 |     fn store(&self, p: CountedPtr<T>, order: Ordering) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compare_and_swap`
[INFO] [stderr]    --> src/lib.rs:370:5
[INFO] [stderr]     |
[INFO] [stderr] 370 | /     fn compare_and_swap(
[INFO] [stderr] 371 | |         &self,
[INFO] [stderr] 372 | |         current: CountedPtr<T>,
[INFO] [stderr] 373 | |         new: CountedPtr<T>,
[INFO] [stderr] ...   |
[INFO] [stderr] 382 | |         )
[INFO] [stderr] 383 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compare_exchange`
[INFO] [stderr]    --> src/lib.rs:385:5
[INFO] [stderr]     |
[INFO] [stderr] 385 | /     fn compare_exchange(
[INFO] [stderr] 386 | |         &self,
[INFO] [stderr] 387 | |         current: CountedPtr<T>,
[INFO] [stderr] 388 | |         new: CountedPtr<T>,
[INFO] [stderr] ...   |
[INFO] [stderr] 400 | |         }
[INFO] [stderr] 401 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `extern_prelude` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/lib.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 | #![feature(extern_prelude)]
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:2303:17
[INFO] [stderr]      |
[INFO] [stderr] 2303 |             let mut b = a.clone();
[INFO] [stderr]      |                 ----^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set`
[INFO] [stderr]    --> src/lib.rs:167:5
[INFO] [stderr]     |
[INFO] [stderr] 167 |     fn set(&mut self, count: usize, pointer: *mut T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_ptr`
[INFO] [stderr]    --> src/lib.rs:176:5
[INFO] [stderr]     |
[INFO] [stderr] 176 |     fn set_ptr(&mut self, pointer: *mut T) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_ref`
[INFO] [stderr]    --> src/lib.rs:191:5
[INFO] [stderr]     |
[INFO] [stderr] 191 |     unsafe fn as_ref(&self) -> &T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `as_mut`
[INFO] [stderr]    --> src/lib.rs:195:5
[INFO] [stderr]     |
[INFO] [stderr] 195 |     unsafe fn as_mut(&mut self) -> &mut T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_ptr`
[INFO] [stderr]    --> src/lib.rs:282:5
[INFO] [stderr]     |
[INFO] [stderr] 282 |     fn get_ptr(&self) -> *mut T {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `set_ptr`
[INFO] [stderr]    --> src/lib.rs:287:5
[INFO] [stderr]     |
[INFO] [stderr] 287 |     fn set_ptr(&mut self, pointer: NonNull<T>) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `into_inner`
[INFO] [stderr]    --> src/lib.rs:349:5
[INFO] [stderr]     |
[INFO] [stderr] 349 |     fn into_inner(self) -> CountedPtr<T> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `store`
[INFO] [stderr]    --> src/lib.rs:362:5
[INFO] [stderr]     |
[INFO] [stderr] 362 |     fn store(&self, p: CountedPtr<T>, order: Ordering) {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compare_and_swap`
[INFO] [stderr]    --> src/lib.rs:370:5
[INFO] [stderr]     |
[INFO] [stderr] 370 | /     fn compare_and_swap(
[INFO] [stderr] 371 | |         &self,
[INFO] [stderr] 372 | |         current: CountedPtr<T>,
[INFO] [stderr] 373 | |         new: CountedPtr<T>,
[INFO] [stderr] ...   |
[INFO] [stderr] 382 | |         )
[INFO] [stderr] 383 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `compare_exchange`
[INFO] [stderr]    --> src/lib.rs:385:5
[INFO] [stderr]     |
[INFO] [stderr] 385 | /     fn compare_exchange(
[INFO] [stderr] 386 | |         &self,
[INFO] [stderr] 387 | |         current: CountedPtr<T>,
[INFO] [stderr] 388 | |         new: CountedPtr<T>,
[INFO] [stderr] ...   |
[INFO] [stderr] 400 | |         }
[INFO] [stderr] 401 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `check`
[INFO] [stderr]     --> src/lib.rs:2175:9
[INFO] [stderr]      |
[INFO] [stderr] 2175 |         fn check(&self) {
[INFO] [stderr]      |         ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `extern_prelude` has been stable since 1.30.0 and no longer requires an attribute to enable
[INFO] [stderr]   --> src/lib.rs:83:12
[INFO] [stderr]    |
[INFO] [stderr] 83 | #![feature(extern_prelude)]
[INFO] [stderr]    |            ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/main.rs:203:5
[INFO] [stderr]     |
[INFO] [stderr] 203 | /     {
[INFO] [stderr] 204 | |         // Stress-test swaps
[INFO] [stderr] 205 | |
[INFO] [stderr] 206 | |         let a = 100;
[INFO] [stderr] ...   |
[INFO] [stderr] 243 | |
[INFO] [stderr] 244 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `into_inner`
[INFO] [stderr]   --> src/main.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn into_inner(self) -> T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]    --> src/main.rs:203:5
[INFO] [stderr]     |
[INFO] [stderr] 203 | /     {
[INFO] [stderr] 204 | |         // Stress-test swaps
[INFO] [stderr] 205 | |
[INFO] [stderr] 206 | |         let a = 100;
[INFO] [stderr] ...   |
[INFO] [stderr] 243 | |
[INFO] [stderr] 244 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unreachable_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `into_inner`
[INFO] [stderr]   --> src/main.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn into_inner(self) -> T {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.54s
[INFO] running `"docker" "inspect" "51c763b73412e9a38e1494a7a1b93e6b54a39363bc8c751971cd4198e66f698a"`
[INFO] running `"docker" "rm" "-f" "51c763b73412e9a38e1494a7a1b93e6b54a39363bc8c751971cd4198e66f698a"`
[INFO] [stdout] 51c763b73412e9a38e1494a7a1b93e6b54a39363bc8c751971cd4198e66f698a