[INFO] crate bigqueue 0.0.2 is already in cache
[INFO] extracting crate bigqueue 0.0.2 into work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/bigqueue/0.0.2
[INFO] extracting crate bigqueue 0.0.2 into work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/bigqueue/0.0.2
[INFO] validating manifest of bigqueue-0.0.2 on toolchain master#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bigqueue-0.0.2 on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bigqueue-0.0.2
[INFO] finished frobbing bigqueue-0.0.2
[INFO] frobbed toml for bigqueue-0.0.2 written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/reg/bigqueue/0.0.2/Cargo.toml
[INFO] started frobbing bigqueue-0.0.2
[INFO] finished frobbing bigqueue-0.0.2
[INFO] frobbed toml for bigqueue-0.0.2 written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/bigqueue/0.0.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking bigqueue-0.0.2 against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-3/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/reg/bigqueue/0.0.2:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] dc213349b0e7d06076a867b9c0542a692af929d868edc73052a653afdba585a2
[INFO] running `"docker" "start" "-a" "dc213349b0e7d06076a867b9c0542a692af929d868edc73052a653afdba585a2"`
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]     Checking lru v0.1.16
[INFO] [stderr]     Checking bigqueue v0.0.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `num_arenas`
[INFO] [stderr]   --> src/bigqueue.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let num_arenas = t_aid + 1 - h_aid;
[INFO] [stderr]    |             ^^^^^^^^^^ help: consider prefixing with an underscore: `_num_arenas`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `tail` is never read
[INFO] [stderr]   --> src/bigqueue.rs:59:17
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stderr]    |                 ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `head` is never read
[INFO] [stderr]   --> src/bigqueue.rs:60:17
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stderr]    |                 ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `num_arenas`
[INFO] [stderr]   --> src/bigqueue.rs:53:13
[INFO] [stderr]    |
[INFO] [stderr] 53 |         let num_arenas = t_aid + 1 - h_aid;
[INFO] [stderr]    |             ^^^^^^^^^^ help: consider prefixing with an underscore: `_num_arenas`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `tail` is never read
[INFO] [stderr]   --> src/bigqueue.rs:59:17
[INFO] [stderr]    |
[INFO] [stderr] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stderr]    |                 ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `head` is never read
[INFO] [stderr]   --> src/bigqueue.rs:60:17
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stderr]    |                 ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `delete_arena_backed_file`
[INFO] [stderr]    --> src/bigqueue.rs:302:5
[INFO] [stderr]     |
[INFO] [stderr] 302 |     fn delete_arena_backed_file(&self, aid: usize) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `file`
[INFO] [stderr]    --> src/bigqueue.rs:431:5
[INFO] [stderr]     |
[INFO] [stderr] 431 |     file: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_bytes`
[INFO] [stderr]    --> src/lib.rs:212:1
[INFO] [stderr]     |
[INFO] [stderr] 212 | fn read_bytes(mmap: &MmapMut, offset: usize, length: u64) -> Option<Vec<u8>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:147:9
[INFO] [stderr]     |
[INFO] [stderr] 147 |         self.write_bytes(n_offset, bytes);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:162:17
[INFO] [stderr]     |
[INFO] [stderr] 162 |                 self.flip_head_page_to(head_aid);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:222:9
[INFO] [stderr]     |
[INFO] [stderr] 222 |         self.index.set_head(aid, offset);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:228:9
[INFO] [stderr]     |
[INFO] [stderr] 228 |         self.index.set_tail(aid, offset);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:317:9
[INFO] [stderr]     |
[INFO] [stderr] 317 |         self.get_tail().write_u64_at(i_offset, length);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:361:13
[INFO] [stderr]     |
[INFO] [stderr] 361 |             self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:367:17
[INFO] [stderr]     |
[INFO] [stderr] 367 |                 self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:391:21
[INFO] [stderr]     |
[INFO] [stderr] 391 |                     self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:400:25
[INFO] [stderr]     |
[INFO] [stderr] 400 |                         self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:547:9
[INFO] [stderr]     |
[INFO] [stderr] 547 |         qi.set_head(1, 3);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:548:9
[INFO] [stderr]     |
[INFO] [stderr] 548 |         qi.set_tail(1, 4);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:569:9
[INFO] [stderr]     |
[INFO] [stderr] 569 |         t.write_u64_at(0, 100u64);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:570:9
[INFO] [stderr]     |
[INFO] [stderr] 570 |         t.write_u64_at(8, 10u64);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `delete_arena_backed_file`
[INFO] [stderr]    --> src/bigqueue.rs:302:5
[INFO] [stderr]     |
[INFO] [stderr] 302 |     fn delete_arena_backed_file(&self, aid: usize) -> bool {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `file`
[INFO] [stderr]    --> src/bigqueue.rs:431:5
[INFO] [stderr]     |
[INFO] [stderr] 431 |     file: String,
[INFO] [stderr]     |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `flush`
[INFO] [stderr]    --> src/bigqueue.rs:518:5
[INFO] [stderr]     |
[INFO] [stderr] 518 |     pub fn flush(&mut self) -> Result<()> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_bytes`
[INFO] [stderr]    --> src/lib.rs:212:1
[INFO] [stderr]     |
[INFO] [stderr] 212 | fn read_bytes(mmap: &MmapMut, offset: usize, length: u64) -> Option<Vec<u8>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:147:9
[INFO] [stderr]     |
[INFO] [stderr] 147 |         self.write_bytes(n_offset, bytes);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:162:17
[INFO] [stderr]     |
[INFO] [stderr] 162 |                 self.flip_head_page_to(head_aid);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:222:9
[INFO] [stderr]     |
[INFO] [stderr] 222 |         self.index.set_head(aid, offset);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:228:9
[INFO] [stderr]     |
[INFO] [stderr] 228 |         self.index.set_tail(aid, offset);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:317:9
[INFO] [stderr]     |
[INFO] [stderr] 317 |         self.get_tail().write_u64_at(i_offset, length);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:361:13
[INFO] [stderr]     |
[INFO] [stderr] 361 |             self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:367:17
[INFO] [stderr]     |
[INFO] [stderr] 367 |                 self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:391:21
[INFO] [stderr]     |
[INFO] [stderr] 391 |                     self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/bigqueue.rs:400:25
[INFO] [stderr]     |
[INFO] [stderr] 400 |                         self.flip_head_page_to(self.head_aid + 1);
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.59s
[INFO] running `"docker" "inspect" "dc213349b0e7d06076a867b9c0542a692af929d868edc73052a653afdba585a2"`
[INFO] running `"docker" "rm" "-f" "dc213349b0e7d06076a867b9c0542a692af929d868edc73052a653afdba585a2"`
[INFO] [stdout] dc213349b0e7d06076a867b9c0542a692af929d868edc73052a653afdba585a2