... rarely¹

Use them between consecutive expressions that place unary +,- or mixed pre/post ++,- in an ambiguous manner.

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... present²

We anticipate support for indexing and looping using foreach shortly.

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... exist³

See http://sources.redhat.com/bugzilla

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... optional⁴

This is only necessary if the types cannot be inferred from other sources, such as the call sites.

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