Option variable
tr_bound_function_applypDefault value: true
When tr_bound_function_applyp is true, Maxima gives a warning if a bound
variable (such as a function argument) is found being used as a function.
tr_bound_function_applyp does not affect the code generated in such cases.
For example, an expression such as g (f, x) := f (x+1) will trigger
the warning message.