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[DOCS] Some more explanation about pragmas.

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chriseth 2018-09-25 20:03:53 +02:00
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docs/layout-of-source-files.rst
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@ -13,6 +13,12 @@ and :ref:`pragma directives<pragma>`.
Pragmas
=======
The ``pragma`` keyword can be used to enable certain compiler features
or checks. A pragma directive is always local to a source file, so
you have to add the pragma to all your files if you want enable it
in all of your project. If you :ref:`import<import>` another file, the pragma
from that file will not automatically apply to the importing file.
.. index:: ! pragma, version
.. _version_pragma:
@ -43,6 +49,13 @@ the exact version of the compiler, so that bugfix releases are still possible.
It is possible to specify much more complex rules for the compiler version,
the expression follows those used by `npm <https://docs.npmjs.com/misc/semver>`_.
.. note::
Using the version pragma will *not* change the version of the compiler.
It will also *not* enable or disable features of the compiler. It will just
instruct the compiler to check whether its version matches the one
required by the pragma. If it does not match, the compiler will issue
an error.
.. index:: ! pragma, experimental
.. _experimental_pragma: