A tuple is, as somebody once described, an `unencapsulated ordered list of heterogeneous values'. The type of a tuple is the tuple type composed of the types of the elements (see section Tuple types).
tuple: `(' tuple_elements `)' ; tuple_elements: tuple_element [`,' tuple_elements]* ; tuple_element: [expression] ;
When used as an rhs expression, each
tuple_element of a tuple
must not be empty. Empty tuple elements are allowed when the tuple is
used as the lhs in an assignment; every empty field indicates a value in
the tuple to be ignored. For example, the following expression is an,
albeith elaborate, way to assign the value 2 to the variable
(,, a,,,) = (0, 1, 2, 3, 4, 5)
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