add extra fields to Debug impl from #1528

Signed-off-by: Eliza Weisman <[email protected]>

tracing-subscriber/src/layer.rs

@@ -1040,12 +1040,20 @@ where
  let alt = f.alternate();
  let mut s = f.debug_struct("Layered");
  s.field("layer", &self.layer).field("inner", &self.inner);
+
+ // These additional fields are more verbose and usually only necessary
+ // for internal debugging purposes, so only print them if alternate mode
+ // is enabled.
  if alt {
  s.field(
  "subscriber",
  &format_args!("PhantomData<{}>", type_name::<S>()),
- );
- };
+ )
+ .field("has_plf_filter_rules", &self.has_plf_filter_rules)
+ .field("has_layer_filter", &self.has_layer_filter)
+ .field("inner_has_layer_filter", &self.inner_has_layer_filter);
+ }
+
  s.finish()
  }
 }