[INFO] crate bigqueue 0.0.2 is already in cache
[INFO] testing bigqueue-0.0.2 against 1.44.0 for beta-1.45-1
[INFO] extracting crate bigqueue 0.0.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate bigqueue 0.0.2 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate bigqueue 0.0.2
[INFO] finished tweaking crates.io crate bigqueue 0.0.2
[INFO] tweaked toml for crates.io crate bigqueue 0.0.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stdout] 9c1ebc249aee1f059903abb8febb41fed55cf917c3675c5bfbf9c298e76012a2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "9c1ebc249aee1f059903abb8febb41fed55cf917c3675c5bfbf9c298e76012a2"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling hashbrown v0.5.0
[INFO] [stderr]    Compiling memmap v0.7.0
[INFO] [stderr]    Compiling lru v0.1.17
[INFO] [stderr]    Compiling bigqueue v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:234:26
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:239:26
[INFO] [stderr]     |
[INFO] [stderr] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/bigqueue.rs:357:41
[INFO] [stderr]     |
[INFO] [stderr] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stderr]     |                                         ^^^^^^^ help: remove these parentheses
[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: if this is intentional, prefix it 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:59:13
[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:60:13
[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 read: `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:212:4
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.73s
[INFO] running `"docker" "inspect" "9c1ebc249aee1f059903abb8febb41fed55cf917c3675c5bfbf9c298e76012a2"`
[INFO] running `"docker" "rm" "-f" "9c1ebc249aee1f059903abb8febb41fed55cf917c3675c5bfbf9c298e76012a2"`
[INFO] [stdout] 9c1ebc249aee1f059903abb8febb41fed55cf917c3675c5bfbf9c298e76012a2
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f0ecadccb36771b1d899386c7dbd8e16e6fd1c9886b45d58b6b9c2b3a5f0d976
[INFO] running `"docker" "start" "-a" "f0ecadccb36771b1d899386c7dbd8e16e6fd1c9886b45d58b6b9c2b3a5f0d976"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling clap v2.33.1
[INFO] [stderr]    Compiling serde_derive v1.0.111
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:234:26
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:239:26
[INFO] [stderr]     |
[INFO] [stderr] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/bigqueue.rs:357:41
[INFO] [stderr]     |
[INFO] [stderr] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stderr]     |                                         ^^^^^^^ help: remove these parentheses
[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: if this is intentional, prefix it 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:59:13
[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:60:13
[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 read: `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:212:4
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bstr v0.2.13
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling cast v0.2.3
[INFO] [stderr]    Compiling csv v1.1.3
[INFO] [stderr]    Compiling criterion-plot v0.3.1
[INFO] [stderr]    Compiling tinytemplate v1.1.0
[INFO] [stderr]    Compiling criterion v0.2.11
[INFO] [stderr]    Compiling bigqueue v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:234:26
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:239:26
[INFO] [stderr]     |
[INFO] [stderr] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/bigqueue.rs:357:41
[INFO] [stderr]     |
[INFO] [stderr] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stderr]     |                                         ^^^^^^^ help: remove these parentheses
[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: if this is intentional, prefix it 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:59:13
[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:60:13
[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 read: `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:212:4
[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: 22 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 47.96s
[INFO] running `"docker" "inspect" "f0ecadccb36771b1d899386c7dbd8e16e6fd1c9886b45d58b6b9c2b3a5f0d976"`
[INFO] running `"docker" "rm" "-f" "f0ecadccb36771b1d899386c7dbd8e16e6fd1c9886b45d58b6b9c2b3a5f0d976"`
[INFO] [stdout] f0ecadccb36771b1d899386c7dbd8e16e6fd1c9886b45d58b6b9c2b3a5f0d976
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] fd93b6b96d9ae48249e16722f87829193bcef6ba2a4318d5bf109d2ea7d03e30
[INFO] running `"docker" "start" "-a" "fd93b6b96d9ae48249e16722f87829193bcef6ba2a4318d5bf109d2ea7d03e30"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:234:26
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:239:26
[INFO] [stderr]     |
[INFO] [stderr] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/bigqueue.rs:357:41
[INFO] [stderr]     |
[INFO] [stderr] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stderr]     |                                         ^^^^^^^ help: remove these parentheses
[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: if this is intentional, prefix it 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:59:13
[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:60:13
[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 read: `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:212:4
[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: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:234:26
[INFO] [stderr]     |
[INFO] [stderr] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around block return value
[INFO] [stderr]    --> src/bigqueue.rs:239:26
[INFO] [stderr]     |
[INFO] [stderr] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]    --> src/bigqueue.rs:357:41
[INFO] [stderr]     |
[INFO] [stderr] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stderr]     |                                         ^^^^^^^ help: remove these parentheses
[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: if this is intentional, prefix it 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:59:13
[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:60:13
[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 read: `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:212:4
[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: 22 warnings emitted
[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: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.19s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/bigqueue-67fee7095dba3c37
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test bigqueue::tests::test_index ... ok
[INFO] [stdout] test bigqueue::tests::test_arena ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests bigqueue
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs -  (line 10) ... FAILED
[INFO] [stdout] test src/lib.rs -  (line 35) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs -  (line 10) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `BigQueue`
[INFO] [stdout]  --> src/lib.rs:12:13
[INFO] [stdout]   |
[INFO] [stdout] 5 | let mut q = BigQueue::new(&"/tmp/bigqueue", true).unwrap();
[INFO] [stdout]   |             ^^^^^^^^ use of undeclared type or module `BigQueue`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs -  (line 35) stdout ----
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `fs`
[INFO] [stdout]  --> src/lib.rs:36:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | fs::create_dir_all(PathBuf::from("/tmp/spsc")).expect("create dir error");
[INFO] [stdout]   | ^^ use of undeclared type or module `fs`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `PathBuf`
[INFO] [stdout]  --> src/lib.rs:36:20
[INFO] [stdout]   |
[INFO] [stdout] 4 | fs::create_dir_all(PathBuf::from("/tmp/spsc")).expect("create dir error");
[INFO] [stdout]   |                    ^^^^^^^ use of undeclared type or module `PathBuf`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `thread`
[INFO] [stdout]  --> src/lib.rs:40:13
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let t = thread::spawn(move|| {
[INFO] [stdout]   |             ^^^^^^ use of undeclared type or module `thread`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `Duration`
[INFO] [stdout]   --> src/lib.rs:46:19
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let two_sec = Duration::from_secs(2);
[INFO] [stdout]    |                   ^^^^^^^^ use of undeclared type or module `Duration`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `thread`
[INFO] [stdout]   --> src/lib.rs:47:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     thread::sleep(two_sec);
[INFO] [stdout]    |     ^^^^^^ use of undeclared type or module `thread`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `PreciseTime`
[INFO] [stdout]   --> src/lib.rs:49:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let start = PreciseTime::now();
[INFO] [stdout]    |                 ^^^^^^^^^^^ use of undeclared type or module `PreciseTime`
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type or module `PreciseTime`
[INFO] [stdout]   --> src/lib.rs:62:15
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let end = PreciseTime::now();
[INFO] [stdout]    |               ^^^^^^^^^^^ use of undeclared type or module `PreciseTime`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 7 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0433`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs -  (line 10)
[INFO] [stdout]     src/lib.rs -  (line 35)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "fd93b6b96d9ae48249e16722f87829193bcef6ba2a4318d5bf109d2ea7d03e30"`
[INFO] running `"docker" "rm" "-f" "fd93b6b96d9ae48249e16722f87829193bcef6ba2a4318d5bf109d2ea7d03e30"`
[INFO] [stdout] fd93b6b96d9ae48249e16722f87829193bcef6ba2a4318d5bf109d2ea7d03e30