DEV: Handle grouped comments with embedded comments.

src/ast/printer/mod.rs

@@ -425,7 +425,15 @@ where
             },
             Expression::Grouped(ref expr, _) => {
                 write!(self.w, "(")?;
+                if self.has_comment(expr.pos().line) {
+                    self.curr_indent += self.indent_size;
+                    did_indent = true;
+                    write!(self.w, "\n")?;
+                }
                 self.render_expr(expr)?;
+                if did_indent {
+                    write!(self.w, "\n")?;
+                }
                 write!(self.w, ")")?;
             }
             Expression::Import(_def) => {

src/ast/printer/test.rs

@@ -360,3 +360,19 @@ fn test_reduce_func_operator_expression_with_embedded_comment() {
     let output = print_to_buffer(input);
     assert_eq!(output, format!("{}\n", input.trim()));
 }
+
+#[test]
+fn test_map_func_operator_expression_with_embedded_comment() {
+    //let input = "// a comment\nfilter(foo, bar);";
+    let input = "// a comment\nmap(\n  // another comment\n  foo,\n  // one more\n  bar);";
+    let output = print_to_buffer(input);
+    assert_eq!(output, format!("{}\n", input.trim()));
+}
+
+#[test]
+fn test_grouped_expression_with_embedded_comment() {
+    //let input = "// a comment\nfilter(foo, bar);";
+    let input = "// a comment\n(\n  // a comment\n  foo\n);";
+    let output = print_to_buffer(input);
+    assert_eq!(output, format!("{}\n", input.trim()));
+}