Well, significant whitespace will play the role of braces, right? You can't have your editor "fix" the braces, either -- the author has to put them in. In the

Well, significant whitespace will play the role of braces, right? You can't have your editor "fix" the braces, either -- the author has to put them in. In the same way, you can't have your editor "fix" the indentation -- the author has to put it in. But with braces, you can do consistency checks, such as that they are properly nested. In a similar way, you can do consistency checks with indentation. For example: line 1 line 2 line 3 The third line is wrong, the transition from line 1 to line 2 introduced an indentation step, and the third line is neither left nor right.