Question: Integrate a procedure

I'm trying to numerically integrate components of the procedure-vector.

interim:=t->evalf(int(r1_lab_deriv(x)[1],x=0..t));

interim(5);

Getting this type of error:

Error, (in r1_rot_deriv) invalid input: fdiff expects its 2nd argument, N, to be of type {integer, name, list(integer), list(name), list(name = constant), set(name), set(name = constant), name = constant}, but received t = x

 A bit of googling gave me an impression that integration of procedures can be rather quirky.

File: ProcIntergration.mw (Problem occurs in the last lines of the file.)

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