[INFO] cloning repository https://github.com/yetone/mirdb
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yetone/mirdb" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyetone%2Fmirdb", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyetone%2Fmirdb'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 67db6c5d2c8d341978dcc2032876815f62946cce
[INFO] checking yetone/mirdb against try#14e4661efa5acbf985e4fe564baae04683366cc1 for pr-157696
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyetone%2Fmirdb" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] removed /workspace/builds/worker-7-tc2/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/yetone/mirdb
[INFO] finished tweaking git repo https://github.com/yetone/mirdb
[INFO] tweaked toml for git repo https://github.com/yetone/mirdb written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/yetone/mirdb on toolchain 14e4661efa5acbf985e4fe564baae04683366cc1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+14e4661efa5acbf985e4fe564baae04683366cc1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/yetone/mirdb already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+14e4661efa5acbf985e4fe564baae04683366cc1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94
[INFO] running `Command { std: "docker" "start" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94", 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" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94" "/opt/rustwide/cargo-home/bin/cargo" "+14e4661efa5acbf985e4fe564baae04683366cc1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94", 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" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94" "/opt/rustwide/cargo-home/bin/cargo" "+14e4661efa5acbf985e4fe564baae04683366cc1" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.51
[INFO] [stderr]     Checking cfg-if v0.1.7
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking futures v0.1.26
[INFO] [stderr]    Compiling proc-macro2 v0.4.28
[INFO] [stderr]     Checking stable_deref_trait v1.1.1
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling syn v0.15.32
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking memoffset v0.2.1
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]    Compiling build_const v0.2.1
[INFO] [stderr]    Compiling bincode v1.1.3
[INFO] [stderr]     Checking tokio-trace-core v0.1.0
[INFO] [stderr]     Checking snap v0.2.5
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking crossbeam-utils v0.6.5
[INFO] [stderr]     Checking owning_ref v0.4.0
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]    Compiling crc v1.8.1
[INFO] [stderr]     Checking scoped-tls v0.1.2
[INFO] [stderr]     Checking integer-encoding v1.0.5
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking iovec v0.1.2
[INFO] [stderr]     Checking net2 v0.2.33
[INFO] [stderr]     Checking num_cpus v1.10.0
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking lru v0.1.15
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking env_logger v0.6.1
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking crossbeam-epoch v0.7.1
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking crossbeam-deque v0.7.1
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]     Checking skip-list v0.1.0 (/opt/rustwide/workdir/skip-list)
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> skip-list/src/list.rs:243:62
[INFO] [stdout]     |
[INFO] [stdout] 243 |             let old_value = next.replace_value(unsafe { mem::uninitialized() });
[INFO] [stdout]     |                                                              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> skip-list/src/node.rs:40:27
[INFO] [stdout]    |
[INFO] [stdout] 40 |             unsafe { mem::uninitialized() },
[INFO] [stdout]    |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> skip-list/src/node.rs:41:27
[INFO] [stdout]    |
[INFO] [stdout] 41 |             unsafe { mem::uninitialized() },
[INFO] [stdout]    |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]    --> skip-list/src/list.rs:243:62
[INFO] [stdout]     |
[INFO] [stdout] 243 |             let old_value = next.replace_value(unsafe { mem::uninitialized() });
[INFO] [stdout]     |                                                              ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> skip-list/src/node.rs:40:27
[INFO] [stdout]    |
[INFO] [stdout] 40 |             unsafe { mem::uninitialized() },
[INFO] [stdout]    |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> skip-list/src/node.rs:41:27
[INFO] [stdout]    |
[INFO] [stdout] 41 |             unsafe { mem::uninitialized() },
[INFO] [stdout]    |                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking tokio-executor v0.1.7
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking tokio-sync v0.1.5
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> skip-list/src/iter.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |                 ::std::mem::replace(&mut self.0, Some(unsafe { &mut *next }));
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[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] 42 |                 let _ = ::std::mem::replace(&mut self.0, Some(unsafe { &mut *next }));
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: implicit autoref creates a reference to the dereference of a raw pointer
[INFO] [stdout]    --> skip-list/src/list.rs:140:18
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((*node_ptr).nexts_.get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                  ^^^--------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this raw pointer has type `*mut SkipListNode<K, V>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: creating a reference requires the pointer target to be valid and imposes aliasing requirements
[INFO] [stdout] note: autoref is being applied to this expression, resulting in: `&mut [*mut SkipListNode<K, V>]`
[INFO] [stdout]    --> skip-list/src/list.rs:140:19
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((*node_ptr).nexts_.get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] note: method calls to `get_unchecked_mut` require a reference
[INFO] [stdout]    --> /rustc/14e4661efa5acbf985e4fe564baae04683366cc1/library/core/src/slice/mod.rs:684:4
[INFO] [stdout]     = note: `#[deny(dangerous_implicit_autorefs)]` on by default
[INFO] [stdout] help: try using a raw pointer method instead; or if this reference is intentional, make it explicit
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((&mut (*node_ptr).nexts_).get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                   +++++                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> skip-list/src/list.rs:295:17
[INFO] [stdout]     |
[INFO] [stdout] 295 |     pub fn iter(&self) -> SkipListIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 295 |     pub fn iter(&self) -> SkipListIter<'_, K, V> {
[INFO] [stdout]     |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> skip-list/src/list.rs:299:21
[INFO] [stdout]     |
[INFO] [stdout] 299 |     pub fn iter_mut(&mut self) -> SkipListIterMut<K, V> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 299 |     pub fn iter_mut(&mut self) -> SkipListIterMut<'_, K, V> {
[INFO] [stdout]     |                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> skip-list/src/node.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Box::from_raw(node_ptr);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |             let _ = Box::from_raw(node_ptr);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `skip-list` (lib) due to 1 previous error; 7 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused return value of `std::mem::replace` that must be used
[INFO] [stdout]   --> skip-list/src/iter.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |                 ::std::mem::replace(&mut self.0, Some(unsafe { &mut *next }));
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: if you don't need the old value, you can just assign the new value directly
[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] 42 |                 let _ = ::std::mem::replace(&mut self.0, Some(unsafe { &mut *next }));
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: implicit autoref creates a reference to the dereference of a raw pointer
[INFO] [stdout]    --> skip-list/src/list.rs:140:18
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((*node_ptr).nexts_.get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                  ^^^--------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     this raw pointer has type `*mut SkipListNode<K, V>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: creating a reference requires the pointer target to be valid and imposes aliasing requirements
[INFO] [stdout] note: autoref is being applied to this expression, resulting in: `&mut [*mut SkipListNode<K, V>]`
[INFO] [stdout]    --> skip-list/src/list.rs:140:19
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((*node_ptr).nexts_.get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                   ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] note: method calls to `get_unchecked_mut` require a reference
[INFO] [stdout]    --> /rustc/14e4661efa5acbf985e4fe564baae04683366cc1/library/core/src/slice/mod.rs:684:4
[INFO] [stdout]     = note: `#[deny(dangerous_implicit_autorefs)]` on by default
[INFO] [stdout] help: try using a raw pointer method instead; or if this reference is intentional, make it explicit
[INFO] [stdout]     |
[INFO] [stdout] 140 |                 *((&mut (*node_ptr).nexts_).get_unchecked_mut(i)) = *(update.nexts_.get_unchecked_mut(i));
[INFO] [stdout]     |                   +++++                   +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> skip-list/src/list.rs:295:17
[INFO] [stdout]     |
[INFO] [stdout] 295 |     pub fn iter(&self) -> SkipListIter<K, V> {
[INFO] [stdout]     |                 ^^^^^     ^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 295 |     pub fn iter(&self) -> SkipListIter<'_, K, V> {
[INFO] [stdout]     |                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> skip-list/src/list.rs:299:21
[INFO] [stdout]     |
[INFO] [stdout] 299 |     pub fn iter_mut(&mut self) -> SkipListIterMut<K, V> {
[INFO] [stdout]     |                     ^^^^^^^^^     ^^^^^^^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 299 |     pub fn iter_mut(&mut self) -> SkipListIterMut<'_, K, V> {
[INFO] [stdout]     |                                                   +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `Box::<T>::from_raw` that must be used
[INFO] [stdout]   --> skip-list/src/node.rs:60:13
[INFO] [stdout]    |
[INFO] [stdout] 60 |             Box::from_raw(node_ptr);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: call `drop(Box::from_raw(ptr))` if you intend to drop the `Box`
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |             let _ = Box::from_raw(node_ptr);
[INFO] [stdout]    |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `skip-list` (lib test) due to 1 previous error; 7 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94", kill_on_drop: false }`
[INFO] [stdout] 528e4871d1ca82ef555ce07e656c4238be51a9f7c773adeaa9a3bbe5df72bf94
