.. _binary-literals:

Binary integer literals
-----------------------

.. extension:: BinaryLiterals
    :shortdesc: Allow binary literal syntax.

    :since: 7.10.1

    :status: Included in :extension:`GHC2024`, :extension:`GHC2021`

    Allow the use of binary notation in integer literals.

Haskell 2010 and Haskell 98 allows for integer literals to be given in
decimal, octal (prefixed by ``0o`` or ``0O``), or hexadecimal notation
(prefixed by ``0x`` or ``0X``).

The language extension :extension:`BinaryLiterals` adds support for expressing
integer literals in binary notation with the prefix ``0b`` or ``0B``. For
instance, the binary integer literal ``0b11001001`` will be desugared into
``fromInteger 201`` when :extension:`BinaryLiterals` is enabled.
