This can either be a traversal or a first-class node depending on whether the given expression is a literal. This exception is made to allow applications to conditionally populate only part of a potentially-large collection if the config is only requesting one or two distinct indices. In particular, it allows the following to be considered a single traversal from the scope: foo.bar[0].baz
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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