From 626c2bc6589101bd1b0231a2608e32b51f73abba Mon Sep 17 00:00:00 2001
From: treeform <starplant@gmail.com>
Date: Sun, 27 Dec 2020 01:45:30 -0800
Subject: [PATCH] Add docs for nnkHiddenStdConv (#16408)

Add it to devel branch this time. I hope this works.
---
 doc/astspec.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/doc/astspec.txt b/doc/astspec.txt
index c41aee96f6..019b735f58 100644
--- a/doc/astspec.txt
+++ b/doc/astspec.txt
@@ -1392,6 +1392,17 @@ Macro declaration
 Macros behave like templates, but ``nnkTemplateDef`` is replaced with
 ``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
 ==================