From 920f9be9aa31d657e7e35a79a47a0c264f60ef40 Mon Sep 17 00:00:00 2001
From: Mathias Stearn <redbeard0531@gmail.com>
Date: Wed, 25 Sep 2019 13:12:54 -0400
Subject: [PATCH] Explicitly state that trailing underscores are banned
 (#12257)

It was explicit in the BNF, but the English text implied it was allowed.
---
 doc/manual.rst | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/doc/manual.rst b/doc/manual.rst
index da4517681..5116b3bda 100644
--- a/doc/manual.rst
+++ b/doc/manual.rst
@@ -249,8 +249,11 @@ Identifiers & Keywords
 ----------------------
 
 Identifiers in Nim can be any string of letters, digits
-and underscores, beginning with a letter. Two immediate following
-underscores ``__`` are not allowed::
+and underscores, with the following restrictions:
+
+* begins with a letter
+* does not end with an underscore ``_``
+* two immediate following underscores ``__`` are not allowed::
 
   letter ::= 'A'..'Z' | 'a'..'z' | '\x80'..'\xff'
   digit ::= '0'..'9'