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Return index of a good place to begin parsing, as close to the
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the caller should pass more prior context then, if possible, or
if not (the entire program text up until the point of interest
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study1 was sufficient to determine the continuation status,
but doing more requires looking at every character. study2
does this for the last interesting statement in the block.
Creates:
self.stmt_start, stmt_end
slice indices of last interesting stmt
self.stmt_bracketing
the bracketing structure of the last interesting stmt; for
example, for the statement "say(boo) or die",
stmt_bracketing will be ((0, 0), (0, 1), (2, 0), (2, 1),
(4, 0)). Strings and comments are treated as brackets, for
the matter.
self.lastch
last interesting character before optional trailing comment
self.lastopenbracketpos
if continuation is C_BRACKET, index of last open bracket
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