@ new_designer:

try:

      if (form>1) {form=1;}

$  Runsun Pan, PhD

$ libs: doctest , faces ( git ), offline doc ( git ),runscad.py( 1 , 2 , git );

$ tips: hash( 1 , 2 ), sweep , var , lerp , animGif

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Although that is correct syntax it won't do what the user intends.

You need something like:
clipped_form = form > 1 ? 1 : form;

or

clipped_form = min(1, form);

You can't reassign variables.

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