Mismatches of parentheses, braces, (angle) brackets, especially in TeX sources which may be rich in those, may be difficult to trace. This little script helps you by writing your text to standard output, after adding a left margin to your text, which will normally be almost empty, but will clearly show any mismatches.

The author is Wybo H. Dekker. The package is Copyright © 2009 Wybo Dekker.