From 3ebf7b42bd930de73f376dd1b3f2060e00b0fe6d Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Wed, 18 Jan 2012 18:52:09 -0800
Subject: [PATCH] rustc: Assert that the parser doesn't assign node id 0

It is reserved for indicating the crate, but doesn't exist in the AST
---
 src/comp/syntax/parse/parser.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/comp/syntax/parse/parser.rs b/src/comp/syntax/parse/parser.rs
index 4a4b22c3e120..174851c4fcbf 100644
--- a/src/comp/syntax/parse/parser.rs
+++ b/src/comp/syntax/parse/parser.rs
@@ -31,6 +31,8 @@ type parse_sess = @{
 fn next_node_id(sess: parse_sess) -> node_id {
     let rv = sess.next_id;
     sess.next_id += 1;
+    // ID 0 is reserved for the crate and doesn't actually exist in the AST
+    assert rv != 0;
     ret rv;
 }