cain

  int i;
  double x, y;
  int f( int, int, int );
  f( 2, x, 3 + i );      // technically ambiguous: argument list or comma expression?

  [ y, i ] = [ t.2, t.0 ];    // reorder and drop tuple elements

  [ i, x, y ] = *pt;      // expand tuple elements to variables

  x = t.1;        // extract 2nd tuple element (zero origin)