Merge pull request #6628 from nkcsgexi/synthesized-target-check

Author: swift-ci

lib/AST/ASTPrinter.cpp

@@ -859,11 +859,16 @@ class PrintAST : public ASTVisitor<PrintAST> {
 
       // Get the innermost nominal type context.
       DeclContext *DC;
-      if (isa<NominalTypeDecl>(Current) || isa<ExtensionDecl>(Current))
+      if (isa<NominalTypeDecl>(Current))
         DC = Current->getInnermostDeclContext();
+      else if (isa<ExtensionDecl>(Current))
+        DC = Current->getInnermostDeclContext()->
+          getAsNominalTypeOrNominalTypeExtensionContext();
       else
         DC = Current->getDeclContext();
 
+      assert(DC->isTypeContext());
+
       // Get the substitutions from our base type.
       auto subMap = CurrentType->getContextSubstitutions(DC);
       auto *M = DC->getParentModule();

test/SourceKit/DocSupport/Inputs/cake.swift

@@ -79,4 +79,7 @@ public protocol P4 {}
 
 extension C1 : P4 {
   public func C1foo() {}
+  public struct C1S1{
+    public func C1S1foo(a : P4) {}
+  }
 }