it's acceptable to have "Variables" set to nil in an EvalContext, if a particular scope has no variables at all. If _no_ contexts in the chain have non-nil variables, this is considered to mean that variables are not allowed at all, which produces a different error message.
Description
fork of https://github.com/hashicorp/hcl
because issue :
https://github.com/hashicorp/hcl/issues/290
these code permit use of "nested" field decoding which is just composite struct
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