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set_leaf

Set a hierarchical module to be leaf. Useful to stub hierarchical instances
Usage:
set_leaf($module_name, $value);
$module_name: The module to be set leaf or not set to leaf
$value: 1 or larger than 1, set the module as leaf. 0 not set to leaf. 
        If $value is not present, the default value is 1.
Examples:
set_leaf($module_a); # set $module_a as a leaf
set_leaf($module_a, 1); # same as the above
set_leaf($module_a, 0); # remove the leaf setting