ste11 :: StackTraceElement
ste11 = StackTraceElement
      { className = "Main"
      , method = "main"
      , lineNumber = 12 }

ste12 :: StackTraceElement
ste12 = StackTraceElement
      { className = "Mapper"
      , method = "map"
      , lineNumber = 44 }

ste13 :: StackTraceElement
ste13 = StackTraceElement
      { className = "Decoder"
      , method = "prepare"
      , lineNumber = 4 }

ste14 :: StackTraceElement
ste14 = StackTraceElement
     { className = "Decoder"
     , method = "decode"
     , lineNumber = 234 }

st1 :: StackTrace
st1 = [ste11, ste12, ste13, ste14]

ste21, ste22, ste23 :: StackTraceElement
ste21 = StackTraceElement
      { className = "Main"
      , method = "main"
      , lineNumber = 12
      }
ste22 = StackTraceElement
      { className = "Mapper"
      , method = "map"
      , lineNumber = 44 }
ste23 = StackTraceElement
      { className = "Decoder"
      , method = "order"
      , lineNumber = 7 }

st2 :: StackTrace
st2 = [ste21, ste22, ste23]

ste3 :: StackTraceElement
ste3 = StackTraceElement
     { className = "Main"
     , method = "run"
     , lineNumber = 33 }

st3 :: StackTrace
st3 = [ste3]