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The record #constraint{} is almost unused outside of the parser
except for two places in asn1ct_check.
The only correct usage of the record is in instance_of_constraints/2.
Eliminate that usage by updating the parser to pass that constraint
in the same way as all other constraints.
In check_integer_range/2, the record is used incorrectly. A
constraint for an integer will never be a list of #constraint{}
records. Therefore, the list comprehension will always produce
an empty list, and check_constr/2 will not actually check anything
(which is kind of lucky, since the 'ValueRange' range constraint
is incorrectly written - the lower and upper bounds should be in
a tuple).
For now, we will not attempt to actually start validating integer
ranges. Firstly (obviously) we will need to be sure that we
correctly handles all forms of constraints, and secondly we will
need to consider whether we need to produce a warning rather than an
error for compatibility reasons.
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