[INFO] fetching crate bigqueue 0.0.2...
[INFO] checking bigqueue-0.0.2 against master#b0696a5160711c068cb1f01b7437db7990d15750 for pr-121848
[INFO] extracting crate bigqueue 0.0.2 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate bigqueue 0.0.2 on toolchain b0696a5160711c068cb1f01b7437db7990d15750
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+b0696a5160711c068cb1f01b7437db7990d15750" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 609f502c5357f1709aed45698391eeb590aeb05019c6a2ec4fc11fad8aa8df78
[INFO] running `Command { std: "docker" "start" "-a" "609f502c5357f1709aed45698391eeb590aeb05019c6a2ec4fc11fad8aa8df78", kill_on_drop: false }`
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[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)]` 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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail` is never read
[INFO] [stdout]   --> src/bigqueue.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head` is never read
[INFO] [stdout]   --> src/bigqueue.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being 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)]` 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, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: move this `impl` block outside the of the current constant `_DERIVE_failure_Fail_FOR_Error`
[INFO] [stdout]     = note: an `impl` definition is non-local if it is nested inside an item and neither the type nor the trait are at the same nesting level as the `impl` block
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[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: `#[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, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: move this `impl` block outside the of the current constant `_DERIVE_failure_core_fmt_Display_FOR_Error`
[INFO] [stdout]     = note: an `impl` definition is non-local if it is nested inside an item and neither the type nor the trait are at the same nesting level as the `impl` block
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[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: 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)]` 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: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking criterion v0.2.11
[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)]` 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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `tail` is never read
[INFO] [stdout]   --> src/bigqueue.rs:59:17
[INFO] [stdout]    |
[INFO] [stdout] 59 |         let mut tail: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `head` is never read
[INFO] [stdout]   --> src/bigqueue.rs:60:17
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let mut head: Option<Rc<UnsafeCell<Arena>>> = None;
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being 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)]` 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, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: move this `impl` block outside the of the current constant `_DERIVE_failure_Fail_FOR_Error`
[INFO] [stdout]     = note: an `impl` definition is non-local if it is nested inside an item and neither the type nor the trait are at the same nesting level as the `impl` block
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[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: `#[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, they should be avoided as they go against expectation
[INFO] [stdout]    --> src/lib.rs:141:10
[INFO] [stdout]     |
[INFO] [stdout] 141 | #[derive(Fail, Debug)]
[INFO] [stdout]     |          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: move this `impl` block outside the of the current constant `_DERIVE_failure_core_fmt_Display_FOR_Error`
[INFO] [stdout]     = note: an `impl` definition is non-local if it is nested inside an item and neither the type nor the trait are at the same nesting level as the `impl` block
[INFO] [stdout]     = note: one exception to the rule are anon-const (`const _: () = { ... }`) at top-level module and anon-const at the same nesting as the trait or type
[INFO] [stdout]     = note: this lint may become deny-by-default in the edition 2024 and higher, see the tracking issue <https://github.com/rust-lang/rust/issues/120363>
[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: 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)]` 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] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.81s
[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 1`
[INFO] running `Command { std: "docker" "inspect" "6c3512b937237daec542fed0fb639ace940c33656f78f6bf9788fd852df6e8ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6c3512b937237daec542fed0fb639ace940c33656f78f6bf9788fd852df6e8ab", kill_on_drop: false }`
[INFO] [stdout] 6c3512b937237daec542fed0fb639ace940c33656f78f6bf9788fd852df6e8ab
