OutlineParserCommon

If the last read offset is strictly greater than start, assign tree the span from start to last read offset, with given point. If the last offset is less than or equal to start, the tree t did not consume any source for its construction. In this case, don't assign a span yet, but wait for its span to be determined by setChildSpans when the parent node is positioned.

Positions tree. If t does not have a span yet, set its span to the given one.

in.offset, except if this is at a new line, in which case lastOffset is preferred.

Unconditionally issue an error at given span, without updating lastErrorOffset.

Issue an error at given offset if beyond last error offset and update lastErrorOffset.

The offset where the last syntax error was reported, or if a skip to a safepoint occurred afterwards, the offset of the safe point.