Sema: Visit hoisted ExtensionDecls in extension binding

Author: slavapestov

lib/Sema/TypeChecker.cpp

@@ -215,11 +215,17 @@ void swift::bindExtensions(ModuleDecl &mod) {
     if (!SF)
       continue;
 
-    for (auto D : SF->getTopLevelDecls()) {
+    auto visitTopLevelDecl = [&](Decl *D) {
       if (auto ED = dyn_cast<ExtensionDecl>(D))
         if (!tryBindExtension(ED))
-          worklist.push_back(ED);
-    }
+          worklist.push_back(ED);;
+    };
+
+    for (auto *D : SF->getTopLevelDecls())
+      visitTopLevelDecl(D);
+
+    for (auto *D : SF->getHoistedDecls())
+      visitTopLevelDecl(D);
   }
 
   // Phase 2 - repeatedly go through the worklist and attempt to bind each