From 8aaf4ab59aacdc910ea132dbb13a67c8d69a1607 Mon Sep 17 00:00:00 2001
From: Tomasz Miąsko <tomasz.miasko@gmail.com>
Date: Wed, 13 Oct 2021 00:00:00 +0000
Subject: Deduplicate regions ids before merging them

The merging code does not expect to see any duplicates.
---
 compiler/rustc_typeck/src/coherence/inherent_impls_overlap.rs | 1 +
 1 file changed, 1 insertion(+)

(limited to 'compiler')

diff --git a/compiler/rustc_typeck/src/coherence/inherent_impls_overlap.rs b/compiler/rustc_typeck/src/coherence/inherent_impls_overlap.rs
index 0373035a09a..beacf301cae 100644
--- a/compiler/rustc_typeck/src/coherence/inherent_impls_overlap.rs
+++ b/compiler/rustc_typeck/src/coherence/inherent_impls_overlap.rs
@@ -192,6 +192,7 @@ impl ItemLikeVisitor<'v> for InherentOverlapChecker<'tcx> {
                             .collect::<SmallVec<[RegionId; 8]>>();
                         // Sort the id list so that the algorithm is deterministic
                         ids.sort_unstable();
+                        ids.dedup();
                         let ids = ids;
                         match &ids[..] {
                             // Create a new connected region
-- 
cgit 1.4.1-3-g733a5