An editor can help there too: I jump to the EOF where the error appears, insert a closing brace, and jump to the matching brace.
However, an even more efficent way to find the missing braces is when the interpreter guesses its place from the indentation of the code (even though the indentation has no semantical meanning). The MzScheme interpreter can do this, and usually guesses right. (I hope perl6 will be able to do this too.) If, however, you reformat the code with an indenter, then the indents will follow the braces you've put there, not the way you think the code should be indented, so then indentation can't provide a clue to the interpreter.