function getNumberOfLinesBetween(left, right) {
			return Math.max(right.loc.start.line - left.loc.end.line - 1, 0);
		}
Calculates number of lines between two nodes. It is assumed that the given `left` node appears before
the given `right` node in the source code. Lines are counted from the end of the `left` node till the
start of the `right` node. If the given nodes are on the same line, it returns `0`, same as if they were
on two consecutive lines.
@param {ASTNode} left node that appears before the given `right` node.
@param {ASTNode} right node that appears after the given `left` node.
@returns {number} number of lines between nodes.