Also in the older tcl (not sure about 8.5+), it would parse { characters inside comments as if they were real braces in the code. So if you put a comment like:

Also in the older tcl (not sure about 8.5+), it would parse { characters inside comments as if they were real braces in the code. So if you put a comment like: # I want to escape the { in the next line then it would cause your code to fail because of unbalanced { characters.