This syntax func(arg...) allows the final argument to be a sequence-typed value that then expands to be one argument for each element of the value. This allows applications to define variadic functions where that's user-friendly while still allowing users to pass tuples to those functions in situations where the args are chosen dynamically.
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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