Correct Incremental Extension Test

Author: CodaFi

lib/AST/DeclContext.cpp

@@ -1024,11 +1024,6 @@ Optional<std::string> IterableDeclContext::getBodyFingerprint() const {
 
 bool IterableDeclContext::areTokensHashedForThisBodyInsteadOfInterfaceHash()
     const {
-  // Do not keep separate hashes for extension bodies because the dependencies
-  // can miss the addition of a member in an extension because there is nothing
-  // corresponding to the fingerprinted nominal dependency node.
-  if (isa<ExtensionDecl>(this))
-    return false;
   return true;
 }
 

test/Incremental/Fingerprints/Inputs/extension-adds-member/definesAB-after.swift

@@ -3,7 +3,7 @@ struct A {
 struct B {
 }
 extension A {
-  var x: Int {17}
+  init(_ x: String = "") {}
 }
 extension B {
 }