from preamble:

"Change Set:		truncatedChanges-ls
Date:			4 September 2003
Author:			Lex Spoon

Handle truncated changes files more gracefully.  The problem actually
can happen, and has been observed at Georgia Tech, e.g. if someone
downloads a file but does not complete the download.   The current
behavior is that pink debuggers pop up; this is extremely confusing for
new users when it happens in places like the Browser.

The solution in this changeset is to fall back on the decompiler.  A
more thorough solution should probably trigger a systematic invalidation
of all source pointers past the end of the changes file, because as time
goes on the changes file will eventually grow large enough to cover the
lost code and the routine will start returning random method code for
the invalid source pointers."
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