formatting empty where clauses when there are return types

Author: mu001999

src/items.rs

@@ -2560,7 +2560,7 @@ fn rewrite_fn_base(
 
         // Comment between return type and the end of the decl.
         let snippet_lo = fd.output.span().hi();
-        if where_clause.predicates.is_empty() {
+        if where_clause.predicates.is_empty() && !where_clause.has_where_token {
             let snippet_hi = span.hi();
             let snippet = context.snippet(mk_sp(snippet_lo, snippet_hi));
             // Try to preserve the layout of the original snippet.

tests/source/empty-where-clauses.rs

@@ -0,0 +1 @@
+fn foo() -> () where {}

tests/target/empty-where-clauses.rs

@@ -0,0 +1 @@
+fn foo() -> () {}