[INFO] fetching crate sandpit 0.3.0...
[INFO] building sandpit-0.3.0 against try#4987e9d4227139400384ab59296ffee3b0fb1183 for pr-146237-2
[INFO] extracting crate sandpit 0.3.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate sandpit 0.3.0
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate sandpit 0.3.0
[INFO] tweaked toml for crates.io crate sandpit 0.3.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate sandpit 0.3.0 on toolchain 4987e9d4227139400384ab59296ffee3b0fb1183
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate sandpit 0.3.0 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" "+4987e9d4227139400384ab59296ffee3b0fb1183" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2ed7e9372188f8f56a78147661f0697bbdb65e1f979830ccb54d0671aed37dec
[INFO] running `Command { std: "docker" "start" "-a" "2ed7e9372188f8f56a78147661f0697bbdb65e1f979830ccb54d0671aed37dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ed7e9372188f8f56a78147661f0697bbdb65e1f979830ccb54d0671aed37dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ed7e9372188f8f56a78147661f0697bbdb65e1f979830ccb54d0671aed37dec", kill_on_drop: false }`
[INFO] [stdout] 2ed7e9372188f8f56a78147661f0697bbdb65e1f979830ccb54d0671aed37dec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4b308fcbf4abee788b866bc8f698e5f67cb280486b5e36df0536122660eab5c2
[INFO] running `Command { std: "docker" "start" "-a" "4b308fcbf4abee788b866bc8f698e5f67cb280486b5e36df0536122660eab5c2", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.81
[INFO] [stderr]    Compiling crossbeam-utils v0.8.20
[INFO] [stderr]    Compiling never-say-never v6.6.666
[INFO] [stderr]    Compiling nimix v0.1.0
[INFO] [stderr]    Compiling higher-kinded-types v0.1.1
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling crossbeam-channel v0.5.13
[INFO] [stderr]    Compiling syn v2.0.60
[INFO] [stderr]    Compiling sandpit_derive v0.3.0
[INFO] [stderr]    Compiling sandpit v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/barrier.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<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]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<'_, T>> {
[INFO] [stdout]     |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collector.rs:211:20
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn new_mutator(&self) -> Mutator {
[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] 211 |     fn new_mutator(&self) -> Mutator<'_> {
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:80:23
[INFO] [stdout]    |
[INFO] [stdout] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<()> {
[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] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<'_, ()> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:84:32
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<()> {
[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] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<'_, ()> {
[INFO] [stdout]    |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.16s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: higher-kinded-types v0.1.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "4b308fcbf4abee788b866bc8f698e5f67cb280486b5e36df0536122660eab5c2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b308fcbf4abee788b866bc8f698e5f67cb280486b5e36df0536122660eab5c2", kill_on_drop: false }`
[INFO] [stdout] 4b308fcbf4abee788b866bc8f698e5f67cb280486b5e36df0536122660eab5c2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+4987e9d4227139400384ab59296ffee3b0fb1183" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 38f2bb6f1e599d40d780b7ba001a18ca2c586bbdf442d810d9f9cdc9b7184f57
[INFO] running `Command { std: "docker" "start" "-a" "38f2bb6f1e599d40d780b7ba001a18ca2c586bbdf442d810d9f9cdc9b7184f57", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.203
[INFO] [stderr]    Compiling serde_derive v1.0.203
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling either v1.12.0
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling serde_json v1.0.117
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling plotters-backend v0.3.6
[INFO] [stderr]    Compiling clap_lex v0.7.0
[INFO] [stderr]    Compiling regex-syntax v0.8.3
[INFO] [stderr]    Compiling anstyle v1.0.7
[INFO] [stderr]    Compiling itertools v0.10.5
[INFO] [stderr]    Compiling plotters-svg v0.3.6
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling clap_builder v4.5.2
[INFO] [stderr]    Compiling rayon v1.10.0
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling is-terminal v0.4.12
[INFO] [stderr]    Compiling crossbeam-channel v0.5.13
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling plotters v0.3.6
[INFO] [stderr]    Compiling regex-automata v0.4.6
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling criterion-plot v0.5.0
[INFO] [stderr]    Compiling oorandom v11.1.3
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling sandpit v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/barrier.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<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]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<'_, T>> {
[INFO] [stdout]     |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collector.rs:211:20
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn new_mutator(&self) -> Mutator {
[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] 211 |     fn new_mutator(&self) -> Mutator<'_> {
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:80:23
[INFO] [stdout]    |
[INFO] [stdout] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<()> {
[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] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<'_, ()> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:84:32
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<()> {
[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] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<'_, ()> {
[INFO] [stdout]    |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling clap v4.5.4
[INFO] [stderr]    Compiling regex v1.10.4
[INFO] [stderr]    Compiling ciborium v0.2.2
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling criterion v0.5.1
[INFO] [stdout] warning: unused variable: `mu`
[INFO] [stdout]    --> examples/linked_list.rs:113:22
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn delete(&self, mu: &'gc Mutator<'gc>, index: usize) -> &T {
[INFO] [stdout]     |                      ^^ help: if this is intentional, prefix it with an underscore: `_mu`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]    --> examples/linked_list.rs:113:45
[INFO] [stdout]     |
[INFO] [stdout] 113 |     fn delete(&self, mu: &'gc Mutator<'gc>, index: usize) -> &T {
[INFO] [stdout]     |                                             ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mu`
[INFO] [stdout]   --> examples/linked_list.rs:92:38
[INFO] [stdout]    |
[INFO] [stdout] 92 |     fn pop_back(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>) -> Option<Gc<'gc, T>> {
[INFO] [stdout]    |                                      ^^ help: if this is intentional, prefix it with an underscore: `_mu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mutator`
[INFO] [stdout]    --> examples/linked_list.rs:253:19
[INFO] [stdout]     |
[INFO] [stdout] 253 |     arena.mutate(|mutator, arena| {
[INFO] [stdout]     |                   ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_mutator`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `arena`
[INFO] [stdout]    --> examples/linked_list.rs:253:28
[INFO] [stdout]     |
[INFO] [stdout] 253 |     arena.mutate(|mutator, arena| {
[INFO] [stdout]     |                            ^^^^^ help: if this is intentional, prefix it with an underscore: `_arena`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `mu`
[INFO] [stdout]    --> examples/linked_list.rs:109:25
[INFO] [stdout]     |
[INFO] [stdout] 109 |     fn pop_front(&self, mu: &'gc Mutator<'gc>) -> Option<T> {
[INFO] [stdout]     |                         ^^ help: if this is intentional, prefix it with an underscore: `_mu`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LinkedListIter` is never constructed
[INFO] [stdout]   --> examples/linked_list.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | struct LinkedListIter<'gc, T: Trace> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> examples/linked_list.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 30 | impl<'gc, T: Trace> LinkedListIter<'gc, T> {
[INFO] [stdout]    | ------------------------------------------ associated function in this implementation
[INFO] [stdout] 31 |     fn new(list: &LinkedList<'gc, T>) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> examples/linked_list.rs:56:8
[INFO] [stdout]     |
[INFO] [stdout]  45 | impl<'gc, T: Trace> LinkedList<'gc, T> {
[INFO] [stdout]     | -------------------------------------- associated items in this implementation
[INFO] [stdout] ...
[INFO] [stdout]  56 |     fn iter(&self) -> LinkedListIter<'gc, T> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout]  60 |     fn push_back(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, val: T) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  76 |     fn push_front(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, val: T) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  92 |     fn pop_back(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>) -> Option<Gc<'gc, T>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 109 |     fn pop_front(&self, mu: &'gc Mutator<'gc>) -> Option<T> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 113 |     fn delete(&self, mu: &'gc Mutator<'gc>, index: usize) -> &T {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 117 |     fn swap(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, index: usize, val: T) {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 161 |     fn at(&self, index: usize) -> Option<&T> {
[INFO] [stdout]     |        ^^
[INFO] [stdout] ...
[INFO] [stdout] 172 |     fn len(&self) -> usize {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 176 |     fn node_at(&self, index: usize) -> Option<Gc<'gc, Node<'gc, T>>> {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 188 |     fn init_push(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, gc_node: GcOpt<'gc, Node<'gc, T>>) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 194 |     fn set_start(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, new: GcOpt<'gc, Node<'gc, T>>) {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 200 |     fn set_end(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, new: GcOpt<'gc, Node<'gc, T>>) {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `set_prev`, `set_next`, `get_val`, `get_next`, and `get_prev` are never used
[INFO] [stdout]    --> examples/linked_list.rs:215:8
[INFO] [stdout]     |
[INFO] [stdout] 214 | impl<'gc, T: Trace> Node<'gc, T> {
[INFO] [stdout]     | -------------------------------- associated items in this implementation
[INFO] [stdout] 215 |     fn new(mu: &'gc Mutator<'gc>, val: T) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 223 |     fn set_prev(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, new: GcOpt<'gc, Self>) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 229 |     fn set_next(this: Gc<'gc, Self>, mu: &'gc Mutator<'gc>, new: GcOpt<'gc, Self>) {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 235 |     fn get_val(&'gc self) -> &T {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 239 |     fn get_next(&'gc self) -> Option<GcMut<'gc, Node<'gc, T>>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 243 |     fn get_prev(&'gc self) -> Option<GcMut<'gc, Node<'gc, T>>> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: eliding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> examples/linked_list.rs:235:30
[INFO] [stdout]     |
[INFO] [stdout] 235 |     fn get_val(&'gc self) -> &T {
[INFO] [stdout]     |                 ---          ^^ the same lifetime is elided here
[INFO] [stdout]     |                 |
[INFO] [stdout]     |                 the lifetime is named 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: consistently use `'gc`
[INFO] [stdout]     |
[INFO] [stdout] 235 |     fn get_val(&'gc self) -> &'gc T {
[INFO] [stdout]     |                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/barrier.rs:146:17
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<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]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 146 |     pub fn into(&self) -> Option<WriteBarrier<'_, T>> {
[INFO] [stdout]     |                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/collector.rs:211:20
[INFO] [stdout]     |
[INFO] [stdout] 211 |     fn new_mutator(&self) -> Mutator {
[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] 211 |     fn new_mutator(&self) -> Mutator<'_> {
[INFO] [stdout]     |                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:80:23
[INFO] [stdout]    |
[INFO] [stdout] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<()> {
[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] 80 |     pub fn yield_lock(&self) -> RwLockReadGuard<'_, ()> {
[INFO] [stdout]    |                                                 +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]   --> src/trace/tracer_controller.rs:84:32
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<()> {
[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] 84 |     pub fn get_time_slice_lock(&self) -> MutexGuard<'_, ()> {
[INFO] [stdout]    |                                                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 47.10s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: higher-kinded-types v0.1.1
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 2`
[INFO] running `Command { std: "docker" "inspect" "38f2bb6f1e599d40d780b7ba001a18ca2c586bbdf442d810d9f9cdc9b7184f57", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "38f2bb6f1e599d40d780b7ba001a18ca2c586bbdf442d810d9f9cdc9b7184f57", kill_on_drop: false }`
[INFO] [stdout] 38f2bb6f1e599d40d780b7ba001a18ca2c586bbdf442d810d9f9cdc9b7184f57
