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Add docs for nnkHiddenStdConv (#16408)

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Add it to devel branch this time. I hope this works.
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treeform 2020-12-27 01:45:30 -08:00 • committed by GitHub
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doc/astspec.txt
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@ -1392,6 +1392,17 @@ Macro declaration
Macros behave like templates, but ``nnkTemplateDef`` is replaced with Macros behave like templates, but ``nnkTemplateDef`` is replaced with
``nnkMacroDef``. ``nnkMacroDef``.
Hidden Standard Conversion
--------------------------
.. code-block:: nim
var f: float = 1
The type of "f" is ``float`` but the type of "1" is actually ``int``. Inserting
``int`` into a ``float`` is a type error. Nim inserts the ``nnkHiddenStdConv``
node around the ``nnkIntLit`` node so that the new node has the correct type of
``float``. This works for any auto converted nodes and makes the conversion
explicit.
Special node kinds Special node kinds
================== ==================