human
Solve the following python programming problem given the following code:
def do_inline(src_fundef, args, dest_type_env, dest_block, result_var = None) : 
    arg_names = src_fundef.arg_names 
    n_expected = len (arg_names) 
    n_given = len (args) 
    arg_str = ','.join (src_fundef.arg_names) 
    assert (n_expected == n_given), ('Function %s expects %d args (%s) but given %d (%s)' % (src_fundef.name, n_expected, arg_str, n_given, args)) 
    rename_dict = { 
        
} 
    def rename_var(old_name) : 
        t = src_fundef.type_env [old_name] 
        new_name = names.refresh (old_name) 
        new_var = Var (new_name, type = t) 
        rename_dict [old_name] = new_var 
        dest_type_env [new_name] = t 
        return new_var 
for (old_formal, actual) in zip (arg_names, args) : 
        if (actual.__class__ in (Var, Const)) : 
            rename_dict [old_formal] = actual 
else : 
            new_var = rename_var (old_formal) 
            dest_block.append (Assign (new_var, actual)) 
for old_name in src_fundef.type_env.iterkeys () : 
        if (old_name not in arg_names) : 
            rename_var (old_name) 
new_body = subst_stmt_list (src_fundef.body, rename_dict) 
    if (result_var is None) : 
        (result_var, new_body) = replace_return_with_var (new_body, dest_type_env, src_fundef.return_type) 
else : 
        new_body = replace_returns (new_body, dest_block) 
dest_block.extend (new_body) 
    return result_var 

    
    

    Fix the buggy line: new_body = replace_returns (new_body, dest_block)
assistant
#Here is Python program to fix the buggy line: new_body = replace_returns (new_body, dest_block)
.

new_body = replace_returns (new_body, result_var)