> You may interpolate a string into a package or variable name using
::($expr) where you'd ordinarily put a package or 
> variable name. The string is allowed to contain additional instances
of ::, which will be interpreted as package
> nesting. You may only interpolate entire names, since the construct
starts with ::, and either ends immediately or is
> continued with another :: outside the curlies.

What curlies?  All I see is parens...

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