--- /dev/null
+// rustfmt-version: One
+// rustfmt-error_on_line_overflow: false
+// rustfmt-indent_style: Block
+
+// rustfmt should not add trailing comma when rewriting macro. See #1528.
+fn a() {
+ panic!("this is a long string that goes past the maximum line length causing rustfmt to insert a comma here:");
+ foo(
+ a,
+ oooptoptoptoptptooptoptoptoptptooptoptoptoptptoptoptoptoptpt(),
+ );
+}