Pass in `this` as a free variable to the closure class

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index a7edec4140187cf5555cd10763e374bcce93932b..13f3b64806263e23903fdfa7d75f63346a140304 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -615,7 +615,6 @@ class BoxFieldElement extends ElementX
 /// A local variable used encode the direct (uncaptured) references to [this].
 class ThisLocal extends Local {
   final MemberEntity memberContext;
-  final hashCode = ElementX.newHashCode();
 
   ThisLocal(this.memberContext);
 
@@ -624,6 +623,15 @@ class ThisLocal extends Local {
   String get name => 'this';
 
   ClassEntity get enclosingClass => memberContext.enclosingClass;
+
+  bool operator ==(obj) {

[sra1, 2017/08/31 16:26:54]

use 'other' for consistency with other implementations of operator==

[Emily Fortuna, 2017/08/31 17:40:52]

Done.

+    return obj is ThisLocal &&
+        obj.name == name &&
+        obj.memberContext == memberContext &&
+        obj.enclosingClass == enclosingClass;
+  }
+
+  int get hashCode => memberContext.hashCode + enclosingClass.hashCode;
 }
 
 /// Call method of a closure class.