String4 = testLex "string literal with octal escaping"
  "\"\\377\""
  [ GoTokStr (Just "\"\\377\"") "\xff"
  , GoTokSemicolon]

te
testString4 = testLex "string literal with octal escaping"
  "\"\\377\""
  [ GoTokStr (Just "\"\\377\"") "\xff"
  , GoTokSemicolon]
testString4 = testLex "string literal with octal escaping"
  "\"\\377\""
  [ GoTokStr (Just "\"\\377\"") "\xff"
  , GoTokSemicolon]