Index: include/clang/AST/ASTImporter.h
===================================================================
--- include/clang/AST/ASTImporter.h
+++ include/clang/AST/ASTImporter.h
@@ -41,6 +41,7 @@
 class Stmt;
 class TagDecl;
 class TypeSourceInfo;
+class Attr;
 
   /// \brief Imports selected nodes from one AST context into another context,
   /// merging AST nodes where appropriate.
@@ -130,6 +131,12 @@
     /// context, or NULL if an error occurred.
     TypeSourceInfo *Import(TypeSourceInfo *FromTSI);
 
+    /// \brief Import the given attribute from the "from" context into the
+    /// "to" context.
+    ///
+    /// \returns the equivalent attribute in the "to" context.
+    Attr *Import(const Attr *FromAttr);
+
     /// \brief Import the given declaration from the "from" context into the 
     /// "to" context.
     ///
Index: lib/AST/ASTImporter.cpp
===================================================================
--- lib/AST/ASTImporter.cpp
+++ lib/AST/ASTImporter.cpp
@@ -2646,8 +2646,8 @@
       Importer.getToContext(), DC, Loc, Name.getAsIdentifierInfo(), T,
       {NamedChain, D->getChainingSize()});
 
-  for (const auto *Attr : D->attrs())
-    ToIndirectField->addAttr(Attr->clone(Importer.getToContext()));
+  for (const auto *A : D->attrs())
+    ToIndirectField->addAttr(Importer.Import(A));
 
   ToIndirectField->setAccess(D->getAccess());
   ToIndirectField->setLexicalDeclContext(LexicalDC);
@@ -4721,15 +4721,8 @@
   SourceLocation ToAttrLoc = Importer.Import(S->getAttrLoc());
   ArrayRef<const Attr*> FromAttrs(S->getAttrs());
   SmallVector<const Attr *, 1> ToAttrs(FromAttrs.size());
-  ASTContext &_ToContext = Importer.getToContext();
-  std::transform(FromAttrs.begin(), FromAttrs.end(), ToAttrs.begin(),
-    [&_ToContext](const Attr *A) -> const Attr * {
-      return A->clone(_ToContext);
-    });
-  for (const auto *ToA : ToAttrs) {
-    if (!ToA)
-      return nullptr;
-  }
+  if (ImportArrayChecked(FromAttrs, ToAttrs.begin()))
+    return nullptr;
   Stmt *ToSubStmt = Importer.Import(S->getSubStmt());
   if (!ToSubStmt && S->getSubStmt())
     return nullptr;
@@ -6544,6 +6537,12 @@
            Import(FromTSI->getTypeLoc().getLocStart()));
 }
 
+Attr *ASTImporter::Import(const Attr *FromAttr) {
+  Attr *ToAttr = FromAttr->clone(ToContext);
+  ToAttr->setRange(Import(FromAttr->getRange()));
+  return ToAttr;
+}
+
 Decl *ASTImporter::GetAlreadyImportedOrNull(Decl *FromD) {
   llvm::DenseMap<Decl *, Decl *>::iterator Pos = ImportedDecls.find(FromD);
   if (Pos != ImportedDecls.end()) {
@@ -7199,8 +7198,8 @@
 
 Decl *ASTImporter::Imported(Decl *From, Decl *To) {
   if (From->hasAttrs()) {
-    for (auto *FromAttr : From->getAttrs())
-      To->addAttr(FromAttr->clone(To->getASTContext()));
+    for (const auto *FromAttr : From->getAttrs())
+      To->addAttr(Import(FromAttr));
   }
   if (From->isUsed()) {
     To->setIsUsed();
Index: test/Import/attr/Inputs/S.cpp
===================================================================
--- test/Import/attr/Inputs/S.cpp
+++ test/Import/attr/Inputs/S.cpp
@@ -0,0 +1,13 @@
+extern void f() __attribute__((const));
+
+struct S {
+  struct {
+    int a __attribute__((packed));
+  };
+};
+
+void stmt() {
+#pragma unroll
+  for (;;)
+    ;
+}
Index: test/Import/attr/test.cpp
===================================================================
--- test/Import/attr/test.cpp
+++ test/Import/attr/test.cpp
@@ -0,0 +1,26 @@
+// RUN: clang-import-test -dump-ast -import %S/Inputs/S.cpp -expression %s | FileCheck %s
+// CHECK: FunctionDecl
+// CHECK-SAME: S.cpp:1:1, col:13
+// CHECK-NEXT: ConstAttr
+// CHECK-SAME: col:32
+
+// CHECK: IndirectFieldDecl
+// CHECK-NEXT: Field
+// CHECK-NEXT: Field
+// CHECK-NEXT: PackedAttr
+// CHECK-SAME: col:26
+
+// CHECK: AttributedStmt
+// CHECK-NEXT: LoopHintAttr
+// CHECK-SAME: line:10:9
+
+extern void f() __attribute__((const));
+
+struct S;
+
+void stmt();
+
+void expr() {
+  f();
+  struct S s;
+}