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.. _tuple-sections:
Tuple sections
--------------
.. extension:: TupleSections
:shortdesc: Enable tuple sections.
:since: 6.12
Allow the use of tuple section syntax
The :extension:`TupleSections` extension enables partially applied
tuple constructors. For example, the following program ::
(, True)
is considered to be an alternative notation for the more unwieldy
alternative ::
\x -> (x, True)
You can omit any combination of arguments to the tuple, as in the
following ::
(, "I", , , "Love", , 1337)
which translates to ::
\a b c d -> (a, "I", b, c, "Love", d, 1337)
If you have `unboxed tuples <#unboxed-tuples>`__ enabled, tuple sections
will also be available for them, like so ::
(# , True #)
Because there is no unboxed unit tuple, the following expression ::
(# #)
continues to stand for the unboxed singleton tuple data constructor.
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