[INFO] fetching crate rust-debugging-locks 0.8.9...
[INFO] testing rust-debugging-locks-0.8.9 against beta-2026-04-21 for beta-1.96-2
[INFO] extracting crate rust-debugging-locks 0.8.9 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate rust-debugging-locks 0.8.9
[INFO] finished tweaking crates.io crate rust-debugging-locks 0.8.9
[INFO] tweaked toml for crates.io crate rust-debugging-locks 0.8.9 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust-debugging-locks 0.8.9 on toolchain beta-2026-04-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate rust-debugging-locks 0.8.9 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" "+beta-2026-04-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7661cfb91702552139056a708cf921b9cb1e763f83a9c1f2b83f6b88a212e2e3
[INFO] running `Command { std: "docker" "start" "-a" "7661cfb91702552139056a708cf921b9cb1e763f83a9c1f2b83f6b88a212e2e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7661cfb91702552139056a708cf921b9cb1e763f83a9c1f2b83f6b88a212e2e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7661cfb91702552139056a708cf921b9cb1e763f83a9c1f2b83f6b88a212e2e3", kill_on_drop: false }`
[INFO] [stdout] 7661cfb91702552139056a708cf921b9cb1e763f83a9c1f2b83f6b88a212e2e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2fe55a8bdbc9725ef78419b51d8f7b2820d1e8d5a73dfd5d24e7cbbfd513181b
[INFO] running `Command { std: "docker" "start" "-a" "2fe55a8bdbc9725ef78419b51d8f7b2820d1e8d5a73dfd5d24e7cbbfd513181b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.51
[INFO] [stderr]    Compiling unicode-ident v1.0.6
[INFO] [stderr]    Compiling quote v1.0.23
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling gimli v0.27.2
[INFO] [stderr]    Compiling serde_derive v1.0.152
[INFO] [stderr]    Compiling adler v1.0.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling rustc-demangle v0.1.21
[INFO] [stderr]    Compiling base58 v0.2.0
[INFO] [stderr]    Compiling miniz_oxide v0.6.2
[INFO] [stderr]    Compiling object v0.30.3
[INFO] [stderr]    Compiling backtrace v0.3.67
[INFO] [stderr]    Compiling addr2line v0.19.0
[INFO] [stderr]    Compiling rust-debugging-locks v0.8.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `MutexGuard`
[INFO] [stdout]  --> src/debugging_locks.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, LockResult, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard, TryLockError, TryLockResult};
[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: `ptr`
[INFO] [stdout]  --> src/debugging_locks.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{ptr, thread};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell` and `RefCell`
[INFO] [stdout]  --> src/debugging_locks.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::AtomicPtr`
[INFO] [stdout]  --> src/debugging_locks.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::atomic::AtomicPtr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Frame`
[INFO] [stdout]   --> src/debugging_locks.rs:10:63
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::stacktrace_util::{backtrack_frame, BacktrackError, Frame, Stracktrace, ThreadInfo};
[INFO] [stdout]    |                                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hash`
[INFO] [stdout]  --> src/stacktrace_util.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::{Hash, Hasher};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:200:32
[INFO] [stdout]     |
[INFO] [stdout] 200 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:232:32
[INFO] [stdout]     |
[INFO] [stdout] 232 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `debug_frames` is never used
[INFO] [stdout]    --> src/stacktrace_util.rs:154:4
[INFO] [stdout]     |
[INFO] [stdout] 154 | fn debug_frames(frames: &Result<Vec<Frame>, BacktrackError>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:136:75
[INFO] [stdout]     |
[INFO] [stdout] 136 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 136 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 136 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:183:75
[INFO] [stdout]     |
[INFO] [stdout] 183 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 183 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 183 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.26s
[INFO] running `Command { std: "docker" "inspect" "2fe55a8bdbc9725ef78419b51d8f7b2820d1e8d5a73dfd5d24e7cbbfd513181b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fe55a8bdbc9725ef78419b51d8f7b2820d1e8d5a73dfd5d24e7cbbfd513181b", kill_on_drop: false }`
[INFO] [stdout] 2fe55a8bdbc9725ef78419b51d8f7b2820d1e8d5a73dfd5d24e7cbbfd513181b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c1a295510b76f04d4626e58720cd1335a25e5b5992810069ba48f83ab09595f2
[INFO] running `Command { std: "docker" "start" "-a" "c1a295510b76f04d4626e58720cd1335a25e5b5992810069ba48f83ab09595f2", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling serde v1.0.152
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stderr]    Compiling serde_json v1.0.94
[INFO] [stderr]    Compiling rayon-core v1.11.0
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling ryu v1.0.13
[INFO] [stderr]    Compiling half v1.8.2
[INFO] [stderr]    Compiling regex-syntax v0.6.28
[INFO] [stderr]    Compiling hashbrown v0.12.3
[INFO] [stderr]    Compiling plotters-backend v0.3.4
[INFO] [stderr]    Compiling os_str_bytes v6.5.0
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[INFO] [stderr]    Compiling itertools v0.10.5
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[INFO] [stderr]    Compiling textwrap v0.16.0
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[INFO] [stderr]    Compiling humantime v2.1.0
[INFO] [stderr]    Compiling termcolor v1.2.0
[INFO] [stderr]    Compiling oorandom v11.1.3
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[INFO] [stderr]    Compiling crossbeam-epoch v0.9.14
[INFO] [stderr]    Compiling indexmap v1.9.2
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[INFO] [stderr]    Compiling aho-corasick v0.7.20
[INFO] [stderr]    Compiling num_cpus v1.15.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling object v0.30.3
[INFO] [stderr]    Compiling clap v3.2.23
[INFO] [stderr]    Compiling crossbeam-deque v0.8.3
[INFO] [stderr]    Compiling regex v1.7.1
[INFO] [stderr]    Compiling criterion-plot v0.5.0
[INFO] [stderr]    Compiling plotters v0.3.4
[INFO] [stderr]    Compiling rayon v1.7.0
[INFO] [stderr]    Compiling env_logger v0.9.3
[INFO] [stderr]    Compiling ciborium v0.2.0
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling backtrace v0.3.67
[INFO] [stderr]    Compiling rust-debugging-locks v0.8.9 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `MutexGuard`
[INFO] [stdout]  --> src/debugging_locks.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, LockResult, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard, TryLockError, TryLockResult};
[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: `ptr`
[INFO] [stdout]  --> src/debugging_locks.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{ptr, thread};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell` and `RefCell`
[INFO] [stdout]  --> src/debugging_locks.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::AtomicPtr`
[INFO] [stdout]  --> src/debugging_locks.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::atomic::AtomicPtr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Frame`
[INFO] [stdout]   --> src/debugging_locks.rs:10:63
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::stacktrace_util::{backtrack_frame, BacktrackError, Frame, Stracktrace, ThreadInfo};
[INFO] [stdout]    |                                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hash`
[INFO] [stdout]  --> src/stacktrace_util.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::{Hash, Hasher};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:200:32
[INFO] [stdout]     |
[INFO] [stdout] 200 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:232:32
[INFO] [stdout]     |
[INFO] [stdout] 232 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `debug_frames` is never used
[INFO] [stdout]    --> src/stacktrace_util.rs:154:4
[INFO] [stdout]     |
[INFO] [stdout] 154 | fn debug_frames(frames: &Result<Vec<Frame>, BacktrackError>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:136:75
[INFO] [stdout]     |
[INFO] [stdout] 136 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 136 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 136 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:183:75
[INFO] [stdout]     |
[INFO] [stdout] 183 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 183 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 183 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling criterion v0.4.0
[INFO] [stdout] warning: unused import: `MutexGuard`
[INFO] [stdout]  --> src/debugging_locks.rs:2:41
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::sync::{Arc, LockResult, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard, TryLockError, TryLockResult};
[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: `ptr`
[INFO] [stdout]  --> src/debugging_locks.rs:3:11
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::{ptr, thread};
[INFO] [stdout]   |           ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Cell` and `RefCell`
[INFO] [stdout]  --> src/debugging_locks.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::cell::{Cell, RefCell};
[INFO] [stdout]   |                 ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::atomic::AtomicPtr`
[INFO] [stdout]  --> src/debugging_locks.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::atomic::AtomicPtr;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Frame`
[INFO] [stdout]   --> src/debugging_locks.rs:10:63
[INFO] [stdout]    |
[INFO] [stdout] 10 | use crate::stacktrace_util::{backtrack_frame, BacktrackError, Frame, Stracktrace, ThreadInfo};
[INFO] [stdout]    |                                                               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Hash`
[INFO] [stdout]  --> src/stacktrace_util.rs:4:17
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::{Hash, Hasher};
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/debugging_locks.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stdout]     |         ----^^^^^^^^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:200:32
[INFO] [stdout]     |
[INFO] [stdout] 200 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `cnt`
[INFO] [stdout]    --> src/debugging_locks.rs:232:32
[INFO] [stdout]     |
[INFO] [stdout] 232 | ...                   cnt: u64,
[INFO] [stdout]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `debug_frames` is never used
[INFO] [stdout]    --> src/stacktrace_util.rs:154:4
[INFO] [stdout]     |
[INFO] [stdout] 154 | fn debug_frames(frames: &Result<Vec<Frame>, BacktrackError>) {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:136:75
[INFO] [stdout]     |
[INFO] [stdout] 136 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<stacktrace_util::Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<stacktrace_util::Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 136 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 136 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/debugging_locks.rs:183:75
[INFO] [stdout]     |
[INFO] [stdout] 183 | ...                   stacktrace_created.clone(),
[INFO] [stdout]     |                                         ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `std::option::Option<stacktrace_util::Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<stacktrace_util::Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 183 -                                                         stacktrace_created.clone(),
[INFO] [stdout] 183 +                                                         stacktrace_created,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 17.96s
[INFO] running `Command { std: "docker" "inspect" "c1a295510b76f04d4626e58720cd1335a25e5b5992810069ba48f83ab09595f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1a295510b76f04d4626e58720cd1335a25e5b5992810069ba48f83ab09595f2", kill_on_drop: false }`
[INFO] [stdout] c1a295510b76f04d4626e58720cd1335a25e5b5992810069ba48f83ab09595f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2026-04-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 06e5c6c84405578d08c7a63d4d5152bb41708d2e7b627e26ae6cd9835a644e5b
[INFO] running `Command { std: "docker" "start" "-a" "06e5c6c84405578d08c7a63d4d5152bb41708d2e7b627e26ae6cd9835a644e5b", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `MutexGuard`
[INFO] [stderr]  --> src/debugging_locks.rs:2:41
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::{Arc, LockResult, Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard, TryLockError, TryLockResult};
[INFO] [stderr]   |                                         ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `ptr`
[INFO] [stderr]  --> src/debugging_locks.rs:3:11
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::{ptr, thread};
[INFO] [stderr]   |           ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `Cell` and `RefCell`
[INFO] [stderr]  --> src/debugging_locks.rs:4:17
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::cell::{Cell, RefCell};
[INFO] [stderr]   |                 ^^^^  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::sync::atomic::AtomicPtr`
[INFO] [stderr]  --> src/debugging_locks.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::sync::atomic::AtomicPtr;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Frame`
[INFO] [stderr]   --> src/debugging_locks.rs:10:63
[INFO] [stderr]    |
[INFO] [stderr] 10 | use crate::stacktrace_util::{backtrack_frame, BacktrackError, Frame, Stracktrace, ThreadInfo};
[INFO] [stderr]    |                                                               ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Hash`
[INFO] [stderr]  --> src/stacktrace_util.rs:4:17
[INFO] [stderr]   |
[INFO] [stderr] 4 | use std::hash::{Hash, Hasher};
[INFO] [stderr]   |                 ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/debugging_locks.rs:106:9
[INFO] [stderr]     |
[INFO] [stderr] 106 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stderr]     |         ----^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/debugging_locks.rs:153:9
[INFO] [stderr]     |
[INFO] [stderr] 153 |     let mut last_returned = &rwlock_wrapped.last_returned_lock_from;
[INFO] [stderr]     |         ----^^^^^^^^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cnt`
[INFO] [stderr]    --> src/debugging_locks.rs:200:32
[INFO] [stderr]     |
[INFO] [stderr] 200 | ...                   cnt: u64,
[INFO] [stderr]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `cnt`
[INFO] [stderr]    --> src/debugging_locks.rs:232:32
[INFO] [stderr]     |
[INFO] [stderr] 232 | ...                   cnt: u64,
[INFO] [stderr]     |                       ^^^ help: if this is intentional, prefix it with an underscore: `_cnt`
[INFO] [stderr] 
[INFO] [stderr] warning: function `debug_frames` is never used
[INFO] [stderr]    --> src/stacktrace_util.rs:154:4
[INFO] [stderr]     |
[INFO] [stderr] 154 | fn debug_frames(frames: &Result<Vec<Frame>, BacktrackError>) {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stderr]    --> src/debugging_locks.rs:136:75
[INFO] [stderr]     |
[INFO] [stderr] 136 | ...                   stacktrace_created.clone(),
[INFO] [stderr]     |                                         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stderr]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]     |
[INFO] [stderr] 136 -                                                         stacktrace_created.clone(),
[INFO] [stderr] 136 +                                                         stacktrace_created,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stderr]    --> src/debugging_locks.rs:183:75
[INFO] [stderr]     |
[INFO] [stderr] 183 | ...                   stacktrace_created.clone(),
[INFO] [stderr]     |                                         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the type `std::option::Option<Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]     |
[INFO] [stderr] 183 -                                                         stacktrace_created.clone(),
[INFO] [stderr] 183 +                                                         stacktrace_created,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-debugging-locks` (lib) generated 13 warnings (run `cargo fix --lib -p rust-debugging-locks` to apply 12 suggestions)
[INFO] [stderr] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stderr]    --> src/debugging_locks.rs:136:75
[INFO] [stderr]     |
[INFO] [stderr] 136 | ...                   stacktrace_created.clone(),
[INFO] [stderr]     |                                         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the type `std::option::Option<stacktrace_util::Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<stacktrace_util::Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stderr]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]     |
[INFO] [stderr] 136 -                                                         stacktrace_created.clone(),
[INFO] [stderr] 136 +                                                         stacktrace_created,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: call to `.clone()` on a reference in this situation does nothing
[INFO] [stderr]    --> src/debugging_locks.rs:183:75
[INFO] [stderr]     |
[INFO] [stderr] 183 | ...                   stacktrace_created.clone(),
[INFO] [stderr]     |                                         ^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: the type `std::option::Option<stacktrace_util::Stracktrace>` does not implement `Clone`, so calling `clone` on `&std::option::Option<stacktrace_util::Stracktrace>` copies the reference, which does not do anything and can be removed
[INFO] [stderr] help: remove this redundant call
[INFO] [stderr]     |
[INFO] [stderr] 183 -                                                         stacktrace_created.clone(),
[INFO] [stderr] 183 +                                                         stacktrace_created,
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-debugging-locks` (lib test) generated 13 warnings (11 duplicates) (run `cargo fix --lib -p rust-debugging-locks --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/rust_debugging_locks-da36de6e1b4478c1)
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test stacktrace_util::tests::stacktrace_from_method ... ok
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests rust_debugging_locks
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.06s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/stacktrace_util.rs - stacktrace_util::backtrack_frame (line 58) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.38s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "06e5c6c84405578d08c7a63d4d5152bb41708d2e7b627e26ae6cd9835a644e5b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06e5c6c84405578d08c7a63d4d5152bb41708d2e7b627e26ae6cd9835a644e5b", kill_on_drop: false }`
[INFO] [stdout] 06e5c6c84405578d08c7a63d4d5152bb41708d2e7b627e26ae6cd9835a644e5b
