Boxed expressions are passed to the back-end which cannot handle them

[Francesco Casella]

All the examples from Modelica.Electrical.Analog.Examples.OpAmps eventually fail when compiled with the new front-end, because boxed expressions are passed to the back-end that cannot handle them.

For example, OpAmps.Comparator contains

#(opAmp.v_out) = smooth(0, min(opAmp.Vps, max(opAmp.Vns, opAmp.V0 * opAmp.v_in)));

This causes a mismatch in equation counting (OMEdit reports 61 equations and 60 variables), and later on also an error in the Backend due to equation-variables mismatch.

Unless this causes significant overhead, a check should be performed at the end of the front-end that no boxed expressions are left for the backend to process, so that meaningful error messages can be issued in that case.

[Per Östlund]

The issue with smooth was fixed in ddd8677, but it seems this was not actually the cause for the equations/variables issue since that issue remains the same.

[Francesco Casella]

This seems to be solved as of 07-02-2018, the backend clears successfully