decoder: Implement InferType
for complex expressions
#256
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As discovered in #251
Related to #247
One alternative (possibly simpler) solution here would be falling back to
ConstraintType()
of the corresponding constraint (List, Set, Tuple, Map, Object). I do see some benefits in the ability to infer types though in the long run.UX Impact
There currently aren't any constraints in the Terraform schema involving "partially known" types as explained above, so there's no expected UX impact on Terraform LS users.
This was only discovered because some existing tests in #251 use the mentioned constraints.