Specifically http://www.scintilla.org/ScintillaDoc.html#SCI_GETFOLDLEVEL

Something like (pseudo code):

curLine = GetCurrentLine();
curFoldLevel = GetFoldLevel(curLine++);
while (!endOfFile) {
  thisFoldLevel = GetFoldLevel(curLine++);
  if (thisFoldLevel == curFoldLevel) {
    // this is the matching closing line
  }
}

It wouldn't work if ruby allows the block ending on the same line as the block start though (I don't know ruby).

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