old_contents: import re
  
  from dmoj.error import CompileError
  from dmoj.executors.compiled_executor import CompiledExecutor
  
  reinline_comment = re.compile(br'//.*?(?=[\r\n])')
  recomment = re.compile(br'/\*.*?\*/', re.DOTALL)
  
  
  def decomment(x):
      return reinline_comment.sub(b'', recomment.sub(b'', x))
  
  
  class Executor(CompiledExecutor):
      ext = 'go'
      name = 'GO'
      nproc = -1
      data_grace = 65536  # Go uses data segment for heap arena map
      address_grace = 786432
      command = 'go'
      syscalls = ['mincore', 'epoll_create1', 'epoll_ctl', 'epoll_pwait']
      test_name = 'echo'
      test_program = '''\
  package main
  
  import "os"
  import "fmt"
  import "bufio"
  
  func main() {
      bio := bufio.NewReader(os.Stdin)
      text, _ := bio.ReadString(0)
      fmt.Print(text)
  }'''
  
      def get_compile_env(self):
          return {
              # Disable cgo, as it may be used for nefarious things, like linking
              # against arbitrary libraries.
              'CGO_ENABLED': '0',
              # We need GOCACHE to compile on Debian 10.0+.
              'GOCACHE': self._dir,
          }
  
      def get_compile_args(self):
          return [self.get_command(), 'build', self._code]
  
      @classmethod
      def get_version_flags(cls, command):
          return ['version']
  
      def create_files(self, problem_id, source_code, *args, **kwargs):
          source_lines = decomment(source_code).strip().split(b'\n')
          if source_lines[0].strip().split() != [b'package', b'main']:
              raise CompileError(b'Your code must be defined in package main.\n')
          super().create_files(problem_id, source_code, *args, **kwargs)
  
new_contents: import re
  
  from dmoj.error import CompileError
  from dmoj.executors.compiled_executor import CompiledExecutor
  
  reinline_comment = re.compile(br'//.*?(?=[\r\n])')
  recomment = re.compile(br'/\*.*?\*/', re.DOTALL)
  
  
  def decomment(x):
      return reinline_comment.sub(b'', recomment.sub(b'', x))
  
  
  class Executor(CompiledExecutor):
      ext = 'go'
      name = 'GO'
      nproc = -1
      data_grace = 65536  # Go uses data segment for heap arena map
      address_grace = 786432
      command = 'go'
      syscalls = ['mincore', 'epoll_create1', 'epoll_ctl', 'epoll_pwait', 'pselect6']
      test_name = 'echo'
      test_program = '''\
  package main
  
  import "os"
  import "fmt"
  import "bufio"
  
  func main() {
      bio := bufio.NewReader(os.Stdin)
      text, _ := bio.ReadString(0)
      fmt.Print(text)
  }'''
  
      def get_compile_env(self):
          return {
              # Disable cgo, as it may be used for nefarious things, like linking
              # against arbitrary libraries.
              'CGO_ENABLED': '0',
              # We need GOCACHE to compile on Debian 10.0+.
              'GOCACHE': self._dir,
          }
  
      def get_compile_args(self):
          return [self.get_command(), 'build', self._code]
  
      @classmethod
      def get_version_flags(cls, command):
          return ['version']
  
      def create_files(self, problem_id, source_code, *args, **kwargs):
          source_lines = decomment(source_code).strip().split(b'\n')
          if source_lines[0].strip().split() != [b'package', b'main']:
              raise CompileError(b'Your code must be defined in package main.\n')
          super().create_files(problem_id, source_code, *args, **kwargs)
  
subject: allow pselect6 syscall