tracing: impl From<EnteredSpan> for Option<Id>

tracing/src/span.rs

@@ -1309,6 +1309,18 @@ impl<'a> From<&'a Span> for Option<Id> {
     }
 }
 
+impl<'a> From<&'a EnteredSpan> for Option<&'a Id> {
+    fn from(span: &'a EnteredSpan) -> Self {
+        span.inner.as_ref().map(|inner| &inner.id)
+    }
+}
+
+impl<'a> From<&'a EnteredSpan> for Option<Id> {
+    fn from(span: &'a EnteredSpan) -> Self {
+        span.inner.as_ref().map(Inner::id)
+    }
+}
+
 impl Drop for Span {
     fn drop(&mut self) {
         if let Some(Inner {
@@ -1394,6 +1406,11 @@ impl Clone for Inner {
 // ===== impl Entered =====
 
 impl EnteredSpan {
+    /// Returns this span's `Id`, if it is enabled.
+    pub fn id(&self) -> Option<Id> {
+        self.inner.as_ref().map(Inner::id)
+    }
+
     /// Exits this span, returning the underlying [`Span`].
     #[inline]
     pub fn exit(mut self) -> Span {
@@ -1445,6 +1462,7 @@ impl Drop for EnteredSpan {
 struct PhantomNotSend {
     ghost: PhantomData<*mut ()>,
 }
+
 #[allow(non_upper_case_globals)]
 const PhantomNotSend: PhantomNotSend = PhantomNotSend { ghost: PhantomData };