Fix scanning for static variables near start of file #274
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At the start of a file, there is no previous statement, and the code which scans for static variables inside a function needs to know the position of the previous statement to determine how far back to scan. Because of the way this scan was implemented, it would throw an exception if performed at the start of a file.
This PR provides a fallback instead so that if we are at the start of a file, the scan will treat the start of the file as the previous statement position.
Fixes #271