From c9502edefdc8d79c6682d23dddffdabe3130ec18 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Sat, 20 Jun 2015 08:33:09 -0400
Subject: [PATCH] add a comment

---
 src/grammar/repr.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/grammar/repr.rs b/src/grammar/repr.rs
index 1e85e20..b5d2e1e 100644
--- a/src/grammar/repr.rs
+++ b/src/grammar/repr.rs
@@ -13,6 +13,8 @@ pub use grammar::parse_tree::{NonterminalString, Span, TerminalString};
 
 #[derive(Clone, Debug)]
 pub struct Grammar {
+    // a unique prefix that can be appended to identifiers to ensure
+    // that they do not conflict with any action strings
     pub prefix: String,
     pub action_fn_defns: Vec<ActionFnDefn>,
     pub productions: Map<NonterminalString, Vec<Production>>,