>>>
assert(
    // Indexing send-sets have an argument for the index.
    (selector.isIndexSet ? 1 : 0) +
        // Non-increment send-sets have one more argument.
        (ast.Operator.INCREMENT_OPERATORS.contains(op.source) ? 0 :
            1) == node.argumentCount());
<<<
assert(
    // Indexing send-sets have an argument for the index.
    (selector.isIndexSet ? 1 : 0) +
            // Non-increment send-sets have one more argument.
            (ast.Operator.INCREMENT_OPERATORS.contains(op.source) ? 0 : 1) ==
        node.argumentCount());
>>> (indent 4)
    assert(
        // Indexing send-sets have an argument for the index.
        (selector.isIndexSet ? 1 : 0) +
            // Non-increment send-sets have one more argument.
            (ast.Operator.INCREMENT_OPERATORS.contains(op.source) ? 0 :
                1) == node.argumentCount());
<<<
    assert(
        // Indexing send-sets have an argument for the index.
        (selector.isIndexSet ? 1 : 0) +
                // Non-increment send-sets have one more argument.
                (ast.Operator.INCREMENT_OPERATORS.contains(op.source)
                    ? 0
                    : 1) ==
            node.argumentCount());