From 0f33d4d93ad80660b1a43f6d5a14e4a9044e79f5 Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Wed, 19 Aug 2020 17:02:29 +0200
Subject: [PATCH] Don't cache given aliases to `this`

A given alias

   given Foo = this

does not need to be cached in a lazy val since `this` is an immutable reference.
---
 .../src/dotty/tools/dotc/transform/CacheAliasImplicits.scala     | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/src/dotty/tools/dotc/transform/CacheAliasImplicits.scala b/compiler/src/dotty/tools/dotc/transform/CacheAliasImplicits.scala
index c4cfe83ae4bb..ad2acb7f7c47 100644
--- a/compiler/src/dotty/tools/dotc/transform/CacheAliasImplicits.scala
+++ b/compiler/src/dotty/tools/dotc/transform/CacheAliasImplicits.scala
@@ -56,6 +56,7 @@ class CacheAliasImplicits extends MiniPhase with IdentityDenotTransformer { this
             if rhsTpe.isStable => false
             case rhsTpe @ TermRef(pre: ThisType, _)
             if rhsTpe.isStable && pre.cls == sym.owner.enclosingClass => false
+            case rhsTpe: ThisType => false
             case _ => true
           }
         case _ => false