diff --git a/clang/lib/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -3309,6 +3309,7 @@
     assert(AT && "lost auto type from lambda return type");
     if (DeduceFunctionTypeFromReturnExpr(FD, ReturnLoc, RetValExp, AT)) {
       FD->setInvalidDecl();
+      // FIXME: preserve the ill-formed return expression.
       return StmtError();
     }
     CurCap->ReturnType = FnRetType = FD->getReturnType();
diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -4655,6 +4655,9 @@
 Sema::DeduceAutoType(TypeLoc Type, Expr *&Init, QualType &Result,
                      Optional<unsigned> DependentDeductionDepth,
                      bool IgnoreConstraints) {
+  // FIXME: continue the following steps if the type is known.
+  if (Init->containsErrors())
+    return DAR_FailedAlreadyDiagnosed;
   if (Init->getType()->isNonOverloadPlaceholderType()) {
     ExprResult NonPlaceholder = CheckPlaceholderExpr(Init);
     if (NonPlaceholder.isInvalid())
diff --git a/clang/test/AST/ast-dump-invalid-auto-return-funcs.cpp b/clang/test/AST/ast-dump-invalid-auto-return-funcs.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/AST/ast-dump-invalid-auto-return-funcs.cpp
@@ -0,0 +1,27 @@
+// RUN: not %clang_cc1 -triple x86_64-unknown-unknown -Wno-unused-value -fcxx-exceptions -frecovery-ast -std=gnu++17 -ast-dump %s | FileCheck -strict-whitespace %s
+
+// CHECK: FunctionDecl {{.*}} s1 'auto ()'
+auto s1(); // valid
+// CHECK: FunctionDecl {{.*}} invalid s2 'auto () -> int'
+auto s2() -> undef();
+// CHECK: FunctionDecl {{.*}} invalid s3 'auto () -> int'
+auto s3() -> decltype(undef());
+// CHECK: FunctionDecl {{.*}} invalid s4 'auto ()'
+auto s4() {
+  return undef();
+}
+// CHECK: FunctionDecl {{.*}} s5 'void ()'
+auto s5() {} // valid, no return stmt, fallback to void
+
+class Foo {
+  // CHECK: CXXMethodDecl {{.*}} foo1 'auto ()'
+  auto foo1(); // valid
+  // CHECK: CXXMethodDecl {{.*}} invalid foo2 'auto () -> int'
+  auto foo2() -> undef();
+  // CHECK: CXXMethodDecl {{.*}} invalid foo3 'auto () -> int'
+  auto foo3() -> decltype(undef());
+  // CHECK: CXXMethodDecl {{.*}} invalid foo4 'auto ()'
+  auto foo4() { return undef(); }
+  // CHECK: CXXMethodDecl {{.*}} foo5 'void ()'
+  auto foo5() {} // valid, no return stmt, fallback to void.
+};
diff --git a/clang/test/AST/ast-dump-recovery.cpp b/clang/test/AST/ast-dump-recovery.cpp
--- a/clang/test/AST/ast-dump-recovery.cpp
+++ b/clang/test/AST/ast-dump-recovery.cpp
@@ -178,10 +178,6 @@
   auto unresolved_typo = gned.*[] {};
 }
 
-// CHECK:      `-TypeAliasDecl {{.*}} Escape 'decltype([] {
-// CHECK-NEXT:   return <recovery-expr>(undef);
-// CHECK-NEXT: }())'
-// CHECK-NEXT:   `-DecltypeType {{.*}} 'decltype([] {
-// CHECK-NEXT:     return <recovery-expr>(undef);
-// CHECK-NEXT:   }())' dependent
-using Escape = decltype([] { return undef(); }());
+// Verified that the generated call operator is invalid.
+// CHECK: |-CXXMethodDecl {{.*}} invalid operator() 'auto () const -> auto'
+using Escape = decltype([] { return undef(); }());
\ No newline at end of file
diff --git a/clang/test/Sema/invalid-bitwidth-expr.mm b/clang/test/Sema/invalid-bitwidth-expr.mm
--- a/clang/test/Sema/invalid-bitwidth-expr.mm
+++ b/clang/test/Sema/invalid-bitwidth-expr.mm
@@ -1,5 +1,4 @@
 // RUN: %clang_cc1 -fobjc-runtime=gcc -frecovery-ast -verify %s
-// RUN: %clang_cc1 -fobjc-runtime=gcc -fno-recovery-ast -verify %s
 
 @interface Ivar
 {
@@ -11,3 +10,11 @@
 
 constexpr int s = sizeof(Ivar);
 constexpr int ss = sizeof(X);
+
+auto func() {
+  return undef(); // expected-error {{use of undeclared identifier}}
+}
+struct Y {
+  int X : func();
+};
+constexpr int sss = sizeof(Y);