From bfe141c4e1a8c19072f4c3e0ea5450961253617b Mon Sep 17 00:00:00 2001
From: Caitlin Potter <snowball@defpixel.com>
Date: Thu, 30 May 2013 00:40:43 -0400
Subject: [PATCH] Fixes #6824 - Correct scan_number() grammar

Show `int_suffix_size` to appear 0 or 1 times
Show `exponent | . dec_lit` to appear 0 or 1 times, to show why `3f;` is a valid number
---
 doc/rust.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/rust.md b/doc/rust.md
index 9839e9e8afd74..1cdb56e246f2f 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -301,10 +301,10 @@ num_lit : nonzero_dec [ dec_digit | '_' ] * num_suffix ?
 num_suffix : int_suffix | float_suffix ;
 
 int_suffix : 'u' int_suffix_size ?
-           | 'i' int_suffix_size ;
+           | 'i' int_suffix_size ? ;
 int_suffix_size : [ '8' | '1' '6' | '3' '2' | '6' '4' ] ;
 
-float_suffix : [ exponent | '.' dec_lit exponent ? ] float_suffix_ty ? ;
+float_suffix : [ exponent | '.' dec_lit exponent ? ] ? float_suffix_ty ? ;
 float_suffix_ty : 'f' [ '3' '2' | '6' '4' ] ;
 exponent : ['E' | 'e'] ['-' | '+' ] ? dec_lit ;
 dec_lit : [ dec_digit | '_' ] + ;