Pull #[inline] into clone_fields

As the warning tells, it has no effect otherwise.
It's unclear whether it's really meaningful, but for now keep in within the macro.

Author: phimuemue

src/flatten_ok.rs

@@ -138,7 +138,6 @@ where
     T: IntoIterator,
     T::IntoIter: Clone,
 {
-    #[inline]
     clone_fields!(iter, inner_front, inner_back);
 }
 

src/impl_macros.rs

@@ -15,6 +15,7 @@ macro_rules! debug_fmt_fields {
 
 macro_rules! clone_fields {
     ($($field:ident),*) => {
+        #[inline] // TODO is this sensible?
         fn clone(&self) -> Self {
             Self {
                 $($field: self.$field.clone(),)*

src/rciter_impl.rs

@@ -51,7 +51,6 @@ pub fn rciter<I>(iterable: I) -> RcIter<I::IntoIter>
 }
 
 impl<I> Clone for RcIter<I> {
-    #[inline]
     clone_fields!(rciter);
 }