class Prism::Translation::Parser::Compiler

def visit_index_operator_write_node(node)

^^^^^^^^^^^^^^^
foo[bar] += baz 
def visit_index_operator_write_node(node)
  arguments = node.arguments&.arguments || []
  arguments << node.block if node.block
  builder.op_assign(
    builder.index(
      visit(node.receiver),
      token(node.opening_loc),
      visit_all(arguments),
      token(node.closing_loc)
    ),
    [node.operator_loc.slice.chomp("="), srange(node.operator_loc)],
    visit(node.value)
  )
end