[INFO] fetching crate mdb 0.0.1...
[INFO] checking mdb-0.0.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate mdb 0.0.1 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate mdb 0.0.1
[INFO] finished tweaking crates.io crate mdb 0.0.1
[INFO] tweaked toml for crates.io crate mdb 0.0.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mdb 0.0.1 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mdb 0.0.1 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07d548cb5b9ae7e21bb4af073b8fb40ac4381789902bd657cc90dcd2af213428
[INFO] running `Command { std: "docker" "start" "-a" "07d548cb5b9ae7e21bb4af073b8fb40ac4381789902bd657cc90dcd2af213428", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07d548cb5b9ae7e21bb4af073b8fb40ac4381789902bd657cc90dcd2af213428", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07d548cb5b9ae7e21bb4af073b8fb40ac4381789902bd657cc90dcd2af213428", kill_on_drop: false }`
[INFO] [stdout] 07d548cb5b9ae7e21bb4af073b8fb40ac4381789902bd657cc90dcd2af213428
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b40984b6fe8688ea75e599b14737a29ff388a6399d2cc8982e7eb88ac7bba4e
[INFO] running `Command { std: "docker" "start" "-a" "8b40984b6fe8688ea75e599b14737a29ff388a6399d2cc8982e7eb88ac7bba4e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.101
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[INFO] [stderr]     Checking atty v0.2.14
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[INFO] [stderr]    Compiling ptr_meta_derive v0.1.4
[INFO] [stderr]    Compiling bytecheck_derive v0.6.5
[INFO] [stderr]    Compiling rkyv_derive v0.7.17
[INFO] [stderr]    Compiling thiserror-impl v1.0.29
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]     Checking ptr_meta v0.1.4
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[INFO] [stderr]     Checking mdb v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Archive`
[INFO] [stdout]  --> src/db.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rkyv::{ser::serializers::AllocSerializer, Archive, Deserialize, Infallible, Serialize};
[INFO] [stdout]   |                                               ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Archive`
[INFO] [stdout]  --> src/db.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use rkyv::{ser::serializers::AllocSerializer, Archive, Deserialize, Infallible, Serialize};
[INFO] [stdout]   |                                               ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `depth`
[INFO] [stdout]    --> src/db.rs:117:28
[INFO] [stdout]     |
[INFO] [stdout] 117 |     pub async fn read_last(depth: u64) {}
[INFO] [stdout]     |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_depth`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `path_builder` is never read
[INFO] [stdout]   --> src/epoch.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct Epoch<T: Tick> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 25 |     path_builder: PathBuilder,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/db.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Magma<T: Tick> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 19 |     source: Option<String>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `curr_epoch` is never read
[INFO] [stdout]    --> src/db.rs:152:5
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub struct EpochIter<'a, T: Tick> {
[INFO] [stdout]     |            --------- field in this struct
[INFO] [stdout] 151 |     epoch_iter: Iter<'a, u64>,
[INFO] [stdout] 152 |     curr_epoch: Option<Epoch<T>>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/index/trie_node.rs:235:23
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn as_subtrie(&self, prefix: Nibblet) -> SubTrie<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] 235 |     pub fn as_subtrie(&self, prefix: Nibblet) -> SubTrie<'_, K, V> {
[INFO] [stdout]     |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/index/iter.rs:112:19
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn child_iter(&self) -> ChildIter<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] 112 |     fn child_iter(&self) -> ChildIter<'_, K, V> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stdout]   --> src/epoch.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type FrameIndex<T: Tick> = Trie<u64, T>;
[INFO] [stdout]    |                      --^^^^
[INFO] [stdout]    |                      | |
[INFO] [stdout]    |                      | will not be checked at usage sites of the type alias
[INFO] [stdout]    |                      help: remove this bound
[INFO] [stdout]    |
[INFO] [stdout]    = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stdout]            see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stdout]    = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stdout]    = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/db.rs:139:19
[INFO] [stdout]     |
[INFO] [stdout] 139 |     pub fn epochs(&self) -> EpochIter<T> {
[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] 139 |     pub fn epochs(&self) -> EpochIter<'_, T> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<Trie<u64, u32>, std::convert::Infallible>
[INFO] [stdout]   --> benches/trie_benches.rs:93:49
[INFO] [stdout]    |
[INFO] [stdout] 93 |             let _deserialized: Trie<u64, u32> = archived.deserialize(&mut Infallible).unwrap();
[INFO] [stdout]    |                                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mdb` (bench "trie_benches") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `depth`
[INFO] [stdout]    --> src/db.rs:117:28
[INFO] [stdout]     |
[INFO] [stdout] 117 |     pub async fn read_last(depth: u64) {}
[INFO] [stdout]     |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_depth`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `AsTrieKey` is never used
[INFO] [stdout]    --> src/index/keys.rs:213:15
[INFO] [stdout]     |
[INFO] [stdout] 213 |     pub trait AsTrieKey {
[INFO] [stdout]     |               ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `path_builder` is never read
[INFO] [stdout]   --> src/epoch.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct Epoch<T: Tick> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 25 |     path_builder: PathBuilder,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `source` is never read
[INFO] [stdout]   --> src/db.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 15 | pub struct Magma<T: Tick> {
[INFO] [stdout]    |            ----- field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 19 |     source: Option<String>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `curr_epoch` is never read
[INFO] [stdout]    --> src/db.rs:152:5
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub struct EpochIter<'a, T: Tick> {
[INFO] [stdout]     |            --------- field in this struct
[INFO] [stdout] 151 |     epoch_iter: Iter<'a, u64>,
[INFO] [stdout] 152 |     curr_epoch: Option<Epoch<T>>,
[INFO] [stdout]     |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/index/trie_node.rs:235:23
[INFO] [stdout]     |
[INFO] [stdout] 235 |     pub fn as_subtrie(&self, prefix: Nibblet) -> SubTrie<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] 235 |     pub fn as_subtrie(&self, prefix: Nibblet) -> SubTrie<'_, K, V> {
[INFO] [stdout]     |                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/index/iter.rs:112:19
[INFO] [stdout]     |
[INFO] [stdout] 112 |     fn child_iter(&self) -> ChildIter<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] 112 |     fn child_iter(&self) -> ChildIter<'_, K, V> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: bounds on generic parameters in type aliases are not enforced
[INFO] [stdout]   --> src/epoch.rs:11:24
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub type FrameIndex<T: Tick> = Trie<u64, T>;
[INFO] [stdout]    |                      --^^^^
[INFO] [stdout]    |                      | |
[INFO] [stdout]    |                      | will not be checked at usage sites of the type alias
[INFO] [stdout]    |                      help: remove this bound
[INFO] [stdout]    |
[INFO] [stdout]    = note: this is a known limitation of the type checker that may be lifted in a future edition.
[INFO] [stdout]            see issue #112792 <https://github.com/rust-lang/rust/issues/112792> for more information
[INFO] [stdout]    = help: add `#![feature(lazy_type_alias)]` to the crate attributes to enable the desired semantics
[INFO] [stdout]    = note: `#[warn(type_alias_bounds)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/db.rs:139:19
[INFO] [stdout]     |
[INFO] [stdout] 139 |     pub fn epochs(&self) -> EpochIter<T> {
[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] 139 |     pub fn epochs(&self) -> EpochIter<'_, T> {
[INFO] [stdout]     |                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8b40984b6fe8688ea75e599b14737a29ff388a6399d2cc8982e7eb88ac7bba4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b40984b6fe8688ea75e599b14737a29ff388a6399d2cc8982e7eb88ac7bba4e", kill_on_drop: false }`
[INFO] [stdout] 8b40984b6fe8688ea75e599b14737a29ff388a6399d2cc8982e7eb88ac7bba4e
