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.. _whitespace:
Whitespace
==========
.. index::
single: Whitespace
As in the Haskell Language Report, Haskell comments are valid whitespace. In
addition, lines (which must end with a line feed character) that begin as
follows are valid whitespace in source code, except immediately after a
``where``, ``let``, ``do`` or ``of`` keyword:
- ``#!``. This accommodates 'shebang' interpreter directives in scripts on
Unix-like operating systems.
- ``<space>#!``, where ``<space>`` is an initial space character before the
'shebang'.
- ``#pragma``. This accommodates the use of a directive that passes additional
information to a compiler.
- ``#line <line> "<file>"``, where ``<line>`` is a positive integer and
``<file>`` can comprise zero or more characters. This accommodates a compiler
directive that resets the numbering of lines of source code, and the
identification of the source code file name, in compiler messages.
- ``#<line> "<file>"``, where ``<line>`` is a positive integer and ``<file>``
can comprise zero or more characters.
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