style: apply rustfmt to code

Update rustfmt configuration.
Apply rustfmt to the code.

rustfmt.toml

@@ -1,11 +1,18 @@
 enum_trailing_comma = true
-ideal_width = 80
 fn_args_density = "Compressed"
+fn_args_layout = "Block"
+format_strings = false
+ideal_width = 80
 match_block_trailing_comma = true
+match_wildcard_trailing_comma = true
 max_width = 99
+normalize_comments = false
+reorder_imported_names = true
 reorder_imports = true
 report_fixme = "Always"
 report_todo = "Always"
-struct_trailing_comma = "Always"
+struct_lit_trailing_comma = "Vertical"
+struct_trailing_comma = "Vertical"
+where_trailing_comma = true
 wrap_comments = true
 write_mode = "Overwrite"

src/lib.rs

@@ -87,7 +87,7 @@ impl<T> LazyCell<T> {
 
     /// Borrows the contents of this lazy cell for the duration of the cell
     /// itself.
-    /// 
+    ///
     /// If the cell has not yet been filled, the cell is first filled using the
     /// function provided.
     pub fn borrow_with<F: FnOnce() -> T>(&self, f: F) -> &T {
@@ -165,12 +165,12 @@ impl<T> AtomicLazyCell<T> {
     }
 }
 
-unsafe impl<T: Sync> Sync for AtomicLazyCell<T> { }
-unsafe impl<T: Send> Send for AtomicLazyCell<T> { }
+unsafe impl<T: Sync> Sync for AtomicLazyCell<T> {}
+unsafe impl<T: Send> Send for AtomicLazyCell<T> {}
 
 #[cfg(test)]
 mod tests {
-    use super::{LazyCell, AtomicLazyCell};
+    use super::{AtomicLazyCell, LazyCell};
 
     #[test]
     fn test_borrow_from_empty() {