Coverage.line_stub

# File tmp/rubies/ruby-3.1.3/ext/coverage/lib/coverage.rb, line 4
def self.line_stub(file)
  lines = File.foreach(file).map { nil }
  iseqs = [RubyVM::InstructionSequence.compile_file(file)]
  until iseqs.empty?
    iseq = iseqs.pop
    iseq.trace_points.each {|n, type| lines[n - 1] = 0 if type == :line }
    iseq.each_child {|child| iseqs << child }
  end
  lines
end