protected function optimizeOutConcatEqual()
	{
		// Start at offset 4 to skip the first four tokens: <?php $this->out.=
		$this->i = 3;

		while ($this->skipTo([T_CONCAT_EQUAL, '.=']))
		{
			// Test whether this T_CONCAT_EQUAL is preceded with $this->out
			if (!$this->isPrecededByOutputVar())
			{
				 continue;
			}

			while ($this->skipPast(';'))
			{
				// Test whether the assignment is followed by another $this->out.= assignment
				if (!$this->isOutputAssignment())
				{
					 break;
				}

				// Replace the semicolon between assignments with a concatenation operator
				$this->tokens[$this->i - 1] = '.';

				// Remove the following $this->out.= assignment and move the cursor past it
				unset($this->tokens[$this->i++]);
				unset($this->tokens[$this->i++]);
				unset($this->tokens[$this->i++]);
				unset($this->tokens[$this->i++]);
			}
		}
	}