text: let _ = require( '../..' ); function decrement( i )
  {
    try
    {
      if( i <= 0 )
      throw _.err( 'negative!' );
      return i-1;
    }
    catch( err )
    {
      throw _.err( err, '\nFailed to decrement' );
    }
  }
  
  function divide( i )
  {
    try
    {
      if( i % 2 === 1 )
      throw _.err( 'odd!' );
      return decrement( i / 2 );
    }
    catch( err )
    {
      throw _.err( err, '\nFailed to divide' );
    }
  }
  
  divide( 0 );
  
  /*
    Routine _.err append throws stack of the error.
  */
  