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Files ending with line comments should not raise error.group_runaway
Updated from base repository
master merged into issue28
Improved version of bugfix ridencww#28 (preserving the cut-off ultimate comment)
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Parsing used to fail with error.group_runaway if the parsed file ends with a line comment group since the newlines before the EOF are suppressed by lookahadDFA(). Therefor, this hack tolerates a single group with endingMode OPEN on the group stack when an EOF token is ahead.