metrics-ub

test recorder::tests::unsoundness ... error: Undefined Behavior: constructing invalid value: encountered a dangling reference (use-after-free)
   --> metrics/src/recorder/mod.rs:264:17
    |
264 |                 dbg!(self.0);
    |                 ^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (use-after-free)
    |
    = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
    = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
    = note: BACKTRACE on thread `recorder::tests`:
    = note: inside `<recorder::tests::unsoundness::Foo<'_> as recorder::Recorder>::describe_counter` at /home/boxy/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/macros.rs:364:13: 364:16
note: inside closure
   --> metrics/src/recorder/mod.rs:315:29
    |
315 |         with_recorder(|rec| rec.describe_counter(KeyName::from_const_str(""), None, "".into()));
    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside closure
   --> metrics/src/recorder/mod.rs:234:22
    |
234 |             unsafe { f(recorder.as_ref()) }
    |                      ^^^^^^^^^^^^^^^^^^^^
    = note: inside `std::thread::LocalKey::<std::cell::Cell<std::option::Option<std::ptr::NonNull<dyn recorder::Recorder>>>>::try_with::<{closure@metrics/src/recorder/mod.rs:228:25: 228:41}, ()>` at /home/boxy/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:311:12: 311:27
    = note: inside `std::thread::LocalKey::<std::cell::Cell<std::option::Option<std::ptr::NonNull<dyn recorder::Recorder>>>>::with::<{closure@metrics/src/recorder/mod.rs:228:25: 228:41}, ()>` at /home/boxy/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:275:15: 275:31
note: inside `recorder::with_recorder::<(), {closure@metrics/src/recorder/mod.rs:315:23: 315:28}>`
   --> metrics/src/recorder/mod.rs:228:5
    |
228 | /     LOCAL_RECORDER.with(|local_recorder| {
229 | |         if let Some(recorder) = local_recorder.get() {
...   |
240 | |     })
    | |______^
note: inside `recorder::tests::unsoundness`
   --> metrics/src/recorder/mod.rs:315:9
    |
315 |         with_recorder(|rec| rec.describe_counter(KeyName::from_const_str(""), None, "".into()));
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: inside closure
   --> metrics/src/recorder/mod.rs:254:21
    |
253 |     #[test]
    |     ------- in this procedural macro expansion
254 |     fn unsoundness() {
    |                     ^
    = note: this error originates in the macro `dbg` which comes from the expansion of the attribute macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)

note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace

error: aborting due to 1 previous error; 15 warnings emitted