/** This pretty-printer uses functions defined in Leon itself.
/** This pretty-printer uses functions defined in Leon itself.
* If not pretty printing function is defined, return the default value instead
* If not pretty printing function is defined, return the default value instead
* @param The list of functions which should be excluded from pretty-printing (to avoid rendering counter-examples of toString methods using the method itself)
* @param The list of functions which should be excluded from pretty-printing (to avoid rendering counter-examples of toString methods using the method itself)
* @return a user defined string for the given typed expression. */
* @return a user defined string for the given typed expression. */