inline several methods to make tracing::event! smaller

tracing-core/src/field.rs

@@ -697,6 +697,7 @@ impl FieldSet {
     ///
     /// [`Identifier`]: super::callsite::Identifier
     /// [`Callsite`]: super::callsite::Callsite
+    #[inline]
     pub(crate) fn callsite(&self) -> callsite::Identifier {
         callsite::Identifier(self.callsite.0)
     }
@@ -734,6 +735,7 @@ impl FieldSet {
     }
 
     /// Returns an iterator over the `Field`s in this `FieldSet`.
+    #[inline]
     pub fn iter(&self) -> Iter {
         let idxs = 0..self.len();
         Iter {
@@ -837,6 +839,7 @@ impl PartialEq for FieldSet {
 
 impl Iterator for Iter {
     type Item = Field;
+    #[inline]
     fn next(&mut self) -> Option<Field> {
         let i = self.idxs.next()?;
         Some(Field {

tracing-core/src/metadata.rs

@@ -274,6 +274,7 @@ impl<'a> Metadata<'a> {
     }
 
     /// Returns the names of the fields on the described span or event.
+    #[inline]
     pub fn fields(&self) -> &field::FieldSet {
         &self.fields
     }

tracing/src/macros.rs

@@ -2314,7 +2314,7 @@ macro_rules! valueset {
         )
     };
 
-    // Remainder is unparseable, but exists --- must be format args!
+    // Remainder is unparsable, but exists --- must be format args!
     (@ { $(,)* $($out:expr),* }, $next:expr, $($rest:tt)+) => {
         $crate::valueset!(@ { (&$next, Some(&format_args!($($rest)+) as &dyn Value)), $($out),* }, $next, )
     };