From 5aaa2f92ee050dadca1c3639dc9283971a7b4e8b Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Fri, 2 Aug 2024 09:39:28 +1000
Subject: [PATCH] Add an assertion to `NodeRange::new`.

---
 compiler/rustc_parse/src/parser/mod.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/rustc_parse/src/parser/mod.rs b/compiler/rustc_parse/src/parser/mod.rs
index 05758fe0624..6a3c4a0c106 100644
--- a/compiler/rustc_parse/src/parser/mod.rs
+++ b/compiler/rustc_parse/src/parser/mod.rs
@@ -238,6 +238,7 @@ impl NodeRange {
     // is the position of the function's start token. This gives
     // `NodeRange(10..15)`.
     fn new(ParserRange(parser_range): ParserRange, start_pos: u32) -> NodeRange {
+        assert!(parser_range.start >= start_pos && parser_range.end >= start_pos);
         NodeRange((parser_range.start - start_pos)..(parser_range.end - start_pos))
     }
 }