.size(@aaa: auto) {
	.set-width(@aaa) {
	  width: @aaa;
	}
	.set-width(@aaa);
  }
  .when-calling-nested-issue-2394 {
	.size() !important;
  }
  .when-calling-nested-with-param-issue-2394 {
	.size(10px) !important;
  }

PHP Fatal error:  Uncaught Less_Exception_Compiler: variable @aaa is undefined in file ..test.less in test.less on line 4, column 11
2|   .size(@aaa: auto) {
3| 	.set-width(@aaa) {
4| 	  width: @aaa;
5| 	}
6| 	.set-width(@aaa);
7|   }