Description:
------------
Any slash style comment (//) that ends with ?> will produce a parse error.

With /* */ style comments, this does not happen.  Have not tested with # style comments.

Reproduce code:
---------------
<?php

//this line ends with ?>
echo 'hello';

?>

and

<?php

class test
{
	//this comment ends with ?>
	public function hello()
	{
		echo 'hello';
	}
}

$test = new test();
$test->hello();

?>

Expected result:
----------------
I expect both examples to echo the word "hello".

Actual result:
--------------
First example: "echo 'hello'; ?>" is printed to the screen.

Second example: Parse error: syntax error, unexpected ';', expecting T_FUNCTION in C:\Apache2\Apache2\htdocs\crap\bug.php on line 5

On a real-world example where I encounted the problem, I got a Parse error: unexpected $end

So the errors vary.