[INFO] fetching crate ferris-gc 0.1.5...
[INFO] checking ferris-gc-0.1.5 against try#8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8 for pr-82565
[INFO] extracting crate ferris-gc 0.1.5 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate ferris-gc 0.1.5 on toolchain 8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ferris-gc 0.1.5
[INFO] finished tweaking crates.io crate ferris-gc 0.1.5
[INFO] tweaked toml for crates.io crate ferris-gc 0.1.5 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "fetch" "--locked" "--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-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7464204db9ee124c6ea2ee8f52a48284e11f4a61115cf630a296c517258f628a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7464204db9ee124c6ea2ee8f52a48284e11f4a61115cf630a296c517258f628a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7464204db9ee124c6ea2ee8f52a48284e11f4a61115cf630a296c517258f628a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7464204db9ee124c6ea2ee8f52a48284e11f4a61115cf630a296c517258f628a", kill_on_drop: false }`
[INFO] [stdout] 7464204db9ee124c6ea2ee8f52a48284e11f4a61115cf630a296c517258f628a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "-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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+8e3afc79c11f48cb3acd1be5b3b7de98fe3f93a8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1ed97c97044847b1242ae1251e144883b3e84f56b704251688c7654e332bfd04
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1ed97c97044847b1242ae1251e144883b3e84f56b704251688c7654e332bfd04", kill_on_drop: false }`
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling syn v1.0.63
[INFO] [stderr]     Checking ferris-gc v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `BTreeMap`, `BTreeSet`, `BinaryHeap`, `HashSet`, `LinkedList`, `VecDeque`
[INFO] [stdout]  --> src/gc.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::{BinaryHeap, BTreeSet, HashMap, BTreeMap, HashSet, LinkedList, VecDeque};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^^           ^^^^^^^^  ^^^^^^^  ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::BorrowMut`
[INFO] [stdout]  --> src/gc.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hasher`
[INFO] [stdout]   --> src/gc/sync.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::hash::Hasher;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:135:26
[INFO] [stdout]     |
[INFO] [stdout] 135 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:140:26
[INFO] [stdout]     |
[INFO] [stdout] 140 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:145:26
[INFO] [stdout]     |
[INFO] [stdout] 145 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:156:26
[INFO] [stdout]     |
[INFO] [stdout] 156 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:135:26
[INFO] [stdout]     |
[INFO] [stdout] 135 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/gc.rs:384:32
[INFO] [stdout]     |
[INFO] [stdout] 382 |         LOCAL_GC_STRATEGY.with(|strategy| unsafe {
[INFO] [stdout]     |                                           ------ because it's nested under this `unsafe` block
[INFO] [stdout] 383 |             if !strategy.borrow().is_active() {
[INFO] [stdout] 384 |                 let strategy = unsafe { &mut *strategy.as_ptr() };
[INFO] [stdout]     |                                ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/gc/sync.rs:519:36
[INFO] [stdout]     |
[INFO] [stdout] 519 |         let (tracer_thin_ptr, _) = unsafe { transmute::<_, (*const (), *const ())>(tracer) };
[INFO] [stdout]     |                                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect_all`
[INFO] [stdout]    --> src/gc/sync.rs:569:15
[INFO] [stdout]     |
[INFO] [stdout] 569 |     unsafe fn collect_all(&self) {
[INFO] [stdout]     |               ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect_all`
[INFO] [stdout]    --> src/gc.rs:602:15
[INFO] [stdout]     |
[INFO] [stdout] 602 |     unsafe fn collect_all(&self) {
[INFO] [stdout]     |               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]    --> src/gc.rs:666:9
[INFO] [stdout]     |
[INFO] [stdout] 666 |         self.start_func.replace(Box::new(start_fn));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]    --> src/gc.rs:667:9
[INFO] [stdout]     |
[INFO] [stdout] 667 |         self.stop_func.replace(Box::new(stop_fn));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/basic_gc_strategy.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             bthread.join();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 15 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling ferris-gc-proc-macro v0.1.2
[INFO] [stdout] warning: unused imports: `BTreeMap`, `BTreeSet`, `BinaryHeap`, `HashSet`, `LinkedList`, `VecDeque`
[INFO] [stdout]  --> src/gc.rs:4:24
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::collections::{BinaryHeap, BTreeSet, HashMap, BTreeMap, HashSet, LinkedList, VecDeque};
[INFO] [stdout]   |                        ^^^^^^^^^^  ^^^^^^^^           ^^^^^^^^  ^^^^^^^  ^^^^^^^^^^  ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::borrow::BorrowMut`
[INFO] [stdout]  --> src/gc.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::borrow::BorrowMut;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hasher`
[INFO] [stdout]   --> src/gc/sync.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | use std::hash::Hasher;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc/sync.rs:707:13
[INFO] [stdout]     |
[INFO] [stdout] 707 |         let mut one = Gc::new(1);
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc/sync.rs:708:9
[INFO] [stdout]     |
[INFO] [stdout] 708 |         one = Gc::new(2);
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc/sync.rs:715:13
[INFO] [stdout]     |
[INFO] [stdout] 715 |         let mut one = Gc::new(1);
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc/sync.rs:716:9
[INFO] [stdout]     |
[INFO] [stdout] 716 |         one = Gc::new(2);
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc/sync.rs:724:17
[INFO] [stdout]     |
[INFO] [stdout] 724 |             let mut one = Gc::new(1);
[INFO] [stdout]     |                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc/sync.rs:725:13
[INFO] [stdout]     |
[INFO] [stdout] 725 |             one = Gc::new(2);
[INFO] [stdout]     |             ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc.rs:741:13
[INFO] [stdout]     |
[INFO] [stdout] 741 |         let mut one = Gc::new(1);
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc.rs:742:9
[INFO] [stdout]     |
[INFO] [stdout] 742 |         one = Gc::new(2);
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc.rs:750:13
[INFO] [stdout]     |
[INFO] [stdout] 750 |         let mut one = Gc::new(1);
[INFO] [stdout]     |             ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc.rs:751:9
[INFO] [stdout]     |
[INFO] [stdout] 751 |         one = Gc::new(2);
[INFO] [stdout]     |         ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `one` is assigned to, but never used
[INFO] [stdout]    --> src/gc.rs:761:17
[INFO] [stdout]     |
[INFO] [stdout] 761 |             let mut one = Gc::new(1);
[INFO] [stdout]     |                 ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_one` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `one` is never read
[INFO] [stdout]    --> src/gc.rs:762:13
[INFO] [stdout]     |
[INFO] [stdout] 762 |             one = Gc::new(2);
[INFO] [stdout]     |             ^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:135:26
[INFO] [stdout]     |
[INFO] [stdout] 135 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:140:26
[INFO] [stdout]     |
[INFO] [stdout] 140 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:145:26
[INFO] [stdout]     |
[INFO] [stdout] 145 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `key`
[INFO] [stdout]    --> src/default_trace.rs:156:26
[INFO] [stdout]     |
[INFO] [stdout] 156 |                       for (key, child) in self {
[INFO] [stdout]     |                            ^^^ help: if this is intentional, prefix it with an underscore: `_key`
[INFO] [stdout] ...
[INFO] [stdout] 170 | / collection_types!(
[INFO] [stdout] 171 | |     HashMap<K, T>, BTreeMap<K, T>
[INFO] [stdout] 172 | | );
[INFO] [stdout]     | |__- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/gc.rs:384:32
[INFO] [stdout]     |
[INFO] [stdout] 382 |         LOCAL_GC_STRATEGY.with(|strategy| unsafe {
[INFO] [stdout]     |                                           ------ because it's nested under this `unsafe` block
[INFO] [stdout] 383 |             if !strategy.borrow().is_active() {
[INFO] [stdout] 384 |                 let strategy = unsafe { &mut *strategy.as_ptr() };
[INFO] [stdout]     |                                ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_unsafe)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary `unsafe` block
[INFO] [stdout]    --> src/gc/sync.rs:519:36
[INFO] [stdout]     |
[INFO] [stdout] 519 |         let (tracer_thin_ptr, _) = unsafe { transmute::<_, (*const (), *const ())>(tracer) };
[INFO] [stdout]     |                                    ^^^^^^ unnecessary `unsafe` block
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect_all`
[INFO] [stdout]    --> src/gc/sync.rs:569:15
[INFO] [stdout]     |
[INFO] [stdout] 569 |     unsafe fn collect_all(&self) {
[INFO] [stdout]     |               ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collect_all`
[INFO] [stdout]    --> src/gc.rs:602:15
[INFO] [stdout]     |
[INFO] [stdout] 602 |     unsafe fn collect_all(&self) {
[INFO] [stdout]     |               ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]    --> src/gc.rs:666:9
[INFO] [stdout]     |
[INFO] [stdout] 666 |         self.start_func.replace(Box::new(start_fn));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused boxed `FnMut` trait object that must be used
[INFO] [stdout]    --> src/gc.rs:667:9
[INFO] [stdout]     |
[INFO] [stdout] 667 |         self.stop_func.replace(Box::new(stop_fn));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: closures are lazy and do nothing unless called
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/basic_gc_strategy.rs:34:13
[INFO] [stdout]    |
[INFO] [stdout] 34 |             bthread.join();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 26 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.14s
[INFO] running `Command { std: "docker" "inspect" "1ed97c97044847b1242ae1251e144883b3e84f56b704251688c7654e332bfd04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ed97c97044847b1242ae1251e144883b3e84f56b704251688c7654e332bfd04", kill_on_drop: false }`
[INFO] [stdout] 1ed97c97044847b1242ae1251e144883b3e84f56b704251688c7654e332bfd04