🚀 go-pugleaf

This patch fixes a bug which kills the compiler in Gordon's memoizing
fib function.  Replace old code in cplus-cvt.c with this code:

static tree
build_type_conversion_1 (xtype, basetype, expr, typename, for_sure)
     tree xtype, basetype;
     tree expr;
     tree typename;
     int for_sure;
{
  tree first_arg = expr;
  tree rval;

  if (for_sure == 0 && ! lvalue_p (expr))
    first_arg = build (NOP_EXPR, TYPE_POINTER_TO (basetype), integer_zero_node);
  rval = build_method_call (first_arg, typename, NULL_TREE, 1, for_sure);
  if (rval == error_mark_node)
    {
      if (for_sure == 0)
	return NULL_TREE;
      return error_mark_node;
    }
  if (first_arg != expr)
    {
      expr = build_up_reference (build_reference_type (TREE_TYPE (expr), expr));
      TREE_VALUE (TREE_OPERAND (rval, 1)) = build_unary_op (ADDR_EXPR, expr, 0);
    }
  return convert (xtype, rval);
}

Michael