function forceTrailingCommaIfMultiline(node) {
			if (isMultiline(node)) {
				forceTrailingComma(node);
			} else {
				forbidTrailingComma(node);
			}
		}
If a given node is multiline, reports the last element of a given node
when it does not have a trailing comma.
Otherwise, reports a trailing comma if it exists.
@param {ASTNode} node A node to check. Its type is one of
  ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
  ImportDeclaration, and ExportNamedDeclaration.
@returns {void}