[INFO] fetching crate bigqueue 0.0.2...
[INFO] checking bigqueue-0.0.2 against try#2cbf9c3ff35600794d69a7dc7ab399810a067910 for pr-129249-2
[INFO] extracting crate bigqueue 0.0.2 into /workspace/builds/worker-3-tc2/source
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate bigqueue 0.0.2 on toolchain 2cbf9c3ff35600794d69a7dc7ab399810a067910
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 69 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.2.11 (available: v0.8.2)
[INFO] [stderr]       Adding lru v0.1.17 (available: v0.18.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking bigqueue-0.0.2 against try#2cbf9c3ff35600794d69a7dc7ab399810a067910 for pr-129249-2
[INFO] extracting crate bigqueue 0.0.2 into /workspace/builds/worker-3-tc2/source
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate bigqueue 0.0.2 on toolchain 2cbf9c3ff35600794d69a7dc7ab399810a067910
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 69 packages to latest compatible versions
[INFO] [stderr]       Adding criterion v0.2.11 (available: v0.8.2)
[INFO] [stderr]       Adding lru v0.1.17 (available: v0.18.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded failure v0.1.8
[INFO] [stderr]   Downloaded failure_derive v0.1.8
[INFO] [stderr]   Downloaded lru v0.1.17
[INFO] [stderr]   Downloaded rand_xoshiro v0.1.0
[INFO] [stderr]   Downloaded cast v0.2.7
[INFO] [stderr]   Downloaded criterion v0.2.11
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[INFO] [stderr]   Downloaded csv-core v0.1.13
[INFO] [stderr]   Downloaded criterion-plot v0.3.1
[INFO] [stderr]   Downloaded csv v1.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4
[INFO] running `Command { std: "docker" "start" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4" "/opt/rustwide/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4" "/opt/rustwide/cargo-home/bin/cargo" "+2cbf9c3ff35600794d69a7dc7ab399810a067910" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling quote v1.0.46
[INFO] [stderr]     Checking memchr v2.8.2
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling object v0.37.3
[INFO] [stderr]    Compiling serde_json v1.0.150
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]     Checking gimli v0.32.3
[INFO] [stderr]    Compiling libc v0.2.186
[INFO] [stderr]     Checking either v1.16.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling cast v0.2.7
[INFO] [stderr]     Checking miniz_oxide v0.8.9
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking unicode-width v0.1.14
[INFO] [stderr]     Checking rustc-demangle v0.1.27
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking hashbrown v0.5.0
[INFO] [stderr]     Checking rand_xoshiro v0.1.0
[INFO] [stderr]     Checking rayon v1.12.0
[INFO] [stderr]    Compiling syn v2.0.118
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking lru v0.1.17
[INFO] [stderr]     Checking csv-core v0.1.13
[INFO] [stderr]     Checking criterion-plot v0.3.1
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking addr2line v0.25.1
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking csv v1.4.0
[INFO] [stderr]     Checking tinytemplate v1.2.1
[INFO] [stderr]     Checking backtrace v0.3.76
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking bigqueue v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/bigqueue.rs:234:26
[INFO] [stdout]     |
[INFO] [stdout] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stdout]     |                          ^                              ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 234 -         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stdout] 234 +         let m = unsafe { &mut (*self.q_head.get()).mmap };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/bigqueue.rs:239:26
[INFO] [stdout]     |
[INFO] [stdout] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stdout]     |                          ^                         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 239 -         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stdout] 239 +         let m = unsafe { &mut (*self.q_tail.get()) };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/bigqueue.rs:357:41
[INFO] [stdout]     |
[INFO] [stdout] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stdout]     |                                         ^     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 357 -     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stdout] 357 +     fn read_length(&mut self) -> Option<usize> {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_arenas`
[INFO] [stdout]   --> src/bigqueue.rs:53:13
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let num_arenas = t_aid + 1 - h_aid;
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_arenas`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail` is never read
[INFO] [stdout]   --> src/bigqueue.rs:59:55
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                                                       ^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 64 |         tail = Some(arc.clone());
[INFO] [stdout]    |         ---- `tail` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head` is never read
[INFO] [stdout]   --> src/bigqueue.rs:60:55
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                                                       ^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 70 |             head = Some(arc);
[INFO] [stdout]    |             ---- `head` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking criterion v0.2.11
[INFO] [stdout] warning: function `read_bytes` is never used
[INFO] [stdout]    --> src/lib.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn read_bytes(mmap: &MmapMut, offset: usize, length: u64) -> Option<Vec<u8>> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `delete_arena_backed_file` is never used
[INFO] [stdout]    --> src/bigqueue.rs:302:8
[INFO] [stdout]     |
[INFO] [stdout] 214 | impl BigQueue {
[INFO] [stdout]     | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 302 |     fn delete_arena_backed_file(&self, aid: usize) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]    --> src/bigqueue.rs:431:5
[INFO] [stdout]     |
[INFO] [stdout] 430 | pub struct Index {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] 431 |     file: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `flush` is never used
[INFO] [stdout]    --> src/bigqueue.rs:518:12
[INFO] [stdout]     |
[INFO] [stdout] 477 | impl Arena {
[INFO] [stdout]     | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 518 |     pub fn flush(&mut self) -> Result<()> {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^---
[INFO] [stdout]     |          |
[INFO] [stdout]     |          `Fail` is not local
[INFO] [stdout]     |          move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_Error`
[INFO] [stdout] 142 | pub enum Error {
[INFO] [stdout]     |          ----- `Error` is not local
[INFO] [stdout]     |
[INFO] [stdout]     = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed
[INFO] [stdout]     = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive`
[INFO] [stdout]     = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]     = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout]     = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^---
[INFO] [stdout]     |          |
[INFO] [stdout]     |          `Display` is not local
[INFO] [stdout]     |          move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_Error`
[INFO] [stdout] 142 | pub enum Error {
[INFO] [stdout]     |          ----- `Error` is not local
[INFO] [stdout]     |
[INFO] [stdout]     = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed
[INFO] [stdout]     = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive`
[INFO] [stdout]     = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]     = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint
[INFO] [stdout]     = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |         self.write_bytes(n_offset, bytes);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |         let _ = self.write_bytes(n_offset, bytes);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:162:17
[INFO] [stdout]     |
[INFO] [stdout] 162 |                 self.flip_head_page_to(head_aid);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 162 |                 let _ = self.flip_head_page_to(head_aid);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:222:9
[INFO] [stdout]     |
[INFO] [stdout] 222 |         self.index.set_head(aid, offset);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 222 |         let _ = self.index.set_head(aid, offset);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:228:9
[INFO] [stdout]     |
[INFO] [stdout] 228 |         self.index.set_tail(aid, offset);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 228 |         let _ = self.index.set_tail(aid, offset);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:317:9
[INFO] [stdout]     |
[INFO] [stdout] 317 |         self.get_tail().write_u64_at(i_offset, length);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 317 |         let _ = self.get_tail().write_u64_at(i_offset, length);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:361:13
[INFO] [stdout]     |
[INFO] [stdout] 361 |             self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 361 |             let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:367:17
[INFO] [stdout]     |
[INFO] [stdout] 367 |                 self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 367 |                 let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:391:21
[INFO] [stdout]     |
[INFO] [stdout] 391 |                     self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 391 |                     let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:400:25
[INFO] [stdout]     |
[INFO] [stdout] 400 |                         self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 400 |                         let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/bigqueue.rs:234:26
[INFO] [stdout]     |
[INFO] [stdout] 234 |         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stdout]     |                          ^                              ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 234 -         let m = unsafe { (&mut (*self.q_head.get()).mmap) };
[INFO] [stdout] 234 +         let m = unsafe { &mut (*self.q_head.get()).mmap };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around block return value
[INFO] [stdout]    --> src/bigqueue.rs:239:26
[INFO] [stdout]     |
[INFO] [stdout] 239 |         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stdout]     |                          ^                         ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 239 -         let m = unsafe { (&mut (*self.q_tail.get())) };
[INFO] [stdout] 239 +         let m = unsafe { &mut (*self.q_tail.get()) };
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around type
[INFO] [stdout]    --> src/bigqueue.rs:357:41
[INFO] [stdout]     |
[INFO] [stdout] 357 |     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stdout]     |                                         ^     ^
[INFO] [stdout]     |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 357 -     fn read_length(&mut self) -> Option<(usize)> {
[INFO] [stdout] 357 +     fn read_length(&mut self) -> Option<usize> {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num_arenas`
[INFO] [stdout]   --> src/bigqueue.rs:53:13
[INFO] [stdout]    |
[INFO] [stdout] 53 |         let num_arenas = t_aid + 1 - h_aid;
[INFO] [stdout]    |             ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_num_arenas`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail` is never read
[INFO] [stdout]   --> src/bigqueue.rs:59:55
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                                                       ^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 64 |         tail = Some(arc.clone());
[INFO] [stdout]    |         ---- `tail` is overwritten here before the previous value is read
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head` is never read
[INFO] [stdout]   --> src/bigqueue.rs:60:55
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                                                       ^^^^ this value is reassigned later and never used
[INFO] [stdout] ...
[INFO] [stdout] 70 |             head = Some(arc);
[INFO] [stdout]    |             ---- `head` is overwritten here before the previous value is read
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_bytes` is never used
[INFO] [stdout]    --> src/lib.rs:212:4
[INFO] [stdout]     |
[INFO] [stdout] 212 | fn read_bytes(mmap: &MmapMut, offset: usize, length: u64) -> Option<Vec<u8>> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `delete_arena_backed_file` is never used
[INFO] [stdout]    --> src/bigqueue.rs:302:8
[INFO] [stdout]     |
[INFO] [stdout] 214 | impl BigQueue {
[INFO] [stdout]     | ------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 302 |     fn delete_arena_backed_file(&self, aid: usize) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file` is never read
[INFO] [stdout]    --> src/bigqueue.rs:431:5
[INFO] [stdout]     |
[INFO] [stdout] 430 | pub struct Index {
[INFO] [stdout]     |            ----- field in this struct
[INFO] [stdout] 431 |     file: String,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^---
[INFO] [stdout]     |          |
[INFO] [stdout]     |          `Fail` is not local
[INFO] [stdout]     |          move the `impl` block outside of this constant `_DERIVE_failure_Fail_FOR_Error`
[INFO] [stdout] 142 | pub enum Error {
[INFO] [stdout]     |          ----- `Error` is not local
[INFO] [stdout]     |
[INFO] [stdout]     = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed
[INFO] [stdout]     = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive`
[INFO] [stdout]     = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]     = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint
[INFO] [stdout]     = note: `#[warn(non_local_definitions)]` on by default
[INFO] [stdout]     = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: non-local `impl` definition, `impl` blocks should be written at the same level as their item
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^---
[INFO] [stdout]     |          |
[INFO] [stdout]     |          `Display` is not local
[INFO] [stdout]     |          move the `impl` block outside of this constant `_DERIVE_failure_core_fmt_Display_FOR_Error`
[INFO] [stdout] 142 | pub enum Error {
[INFO] [stdout]     |          ----- `Error` is not local
[INFO] [stdout]     |
[INFO] [stdout]     = note: the derive macro `Fail` defines the non-local `impl`, and may need to be changed
[INFO] [stdout]     = note: the derive macro `Fail` may come from an old version of the `failure_derive` crate, try updating your dependency with `cargo update -p failure_derive`
[INFO] [stdout]     = note: an `impl` is never scoped, even when it is nested inside an item, as it may impact type checking outside of that item, which can be the case if neither the trait or the self type are at the same nesting level as the `impl`
[INFO] [stdout]     = note: items in an anonymous const item (`const _: () = { ... }`) are treated as in the same scope as the anonymous const's declaration for the purpose of this lint
[INFO] [stdout]     = note: this warning originates in the derive macro `Fail` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:147:9
[INFO] [stdout]     |
[INFO] [stdout] 147 |         self.write_bytes(n_offset, bytes);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 147 |         let _ = self.write_bytes(n_offset, bytes);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:162:17
[INFO] [stdout]     |
[INFO] [stdout] 162 |                 self.flip_head_page_to(head_aid);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 162 |                 let _ = self.flip_head_page_to(head_aid);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:222:9
[INFO] [stdout]     |
[INFO] [stdout] 222 |         self.index.set_head(aid, offset);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 222 |         let _ = self.index.set_head(aid, offset);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:228:9
[INFO] [stdout]     |
[INFO] [stdout] 228 |         self.index.set_tail(aid, offset);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 228 |         let _ = self.index.set_tail(aid, offset);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:317:9
[INFO] [stdout]     |
[INFO] [stdout] 317 |         self.get_tail().write_u64_at(i_offset, length);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 317 |         let _ = self.get_tail().write_u64_at(i_offset, length);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:361:13
[INFO] [stdout]     |
[INFO] [stdout] 361 |             self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 361 |             let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:367:17
[INFO] [stdout]     |
[INFO] [stdout] 367 |                 self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 367 |                 let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:391:21
[INFO] [stdout]     |
[INFO] [stdout] 391 |                     self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 391 |                     let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:400:25
[INFO] [stdout]     |
[INFO] [stdout] 400 |                         self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 400 |                         let _ = self.flip_head_page_to(self.head_aid + 1);
[INFO] [stdout]     |                         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:547:9
[INFO] [stdout]     |
[INFO] [stdout] 547 |         qi.set_head(1, 3);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 547 |         let _ = qi.set_head(1, 3);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:548:9
[INFO] [stdout]     |
[INFO] [stdout] 548 |         qi.set_tail(1, 4);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 548 |         let _ = qi.set_tail(1, 4);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:569:9
[INFO] [stdout]     |
[INFO] [stdout] 569 |         t.write_u64_at(0, 100u64);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 569 |         let _ = t.write_u64_at(0, 100u64);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/bigqueue.rs:570:9
[INFO] [stdout]     |
[INFO] [stdout] 570 |         t.write_u64_at(8, 10u64);
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 570 |         let _ = t.write_u64_at(8, 10u64);
[INFO] [stdout]     |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 20.88s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.2.11
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 3`
[INFO] running `Command { std: "docker" "inspect" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4", kill_on_drop: false }`
[INFO] [stdout] e855b6906c2d5ccc84e010278a8834bb677dbb9614561e14f8fcec722d8931c4
