class Prism::Translation::Parser::Compiler

def visit_defined_node(node)

^^^^^^^^^^^
defined?(a)

^^^^^^^^^^
defined? a 
def visit_defined_node(node)
  builder.keyword_cmd(
    :defined?,
    token(node.keyword_loc),
    token(node.lparen_loc),
    [visit(node.value)],
    token(node.rparen_loc)
  )
end