Parse closure parameters
Parse closure parameters

See SO6/Closure parameters.  For example:

    sub limited_grep(Int $count, &block:(Dog)), *@list) { ... }

These currently sort-of parse, but :(Dog) is considered a *trait*, and
that doesn't sit right with something in the compiler, so it results in
this error:

    Cannot invoke this object (REPR: P6opaque, cs = 0)

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