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diff --git a/clang-r353983/include/clang/Sema/SemaLambda.h b/clang-r353983/include/clang/Sema/SemaLambda.h
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+//===--- SemaLambda.h - Lambda Helper Functions --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file provides some common utility functions for processing
+/// Lambdas.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SEMA_SEMALAMBDA_H
+#define LLVM_CLANG_SEMA_SEMALAMBDA_H
+
+#include "clang/AST/ASTLambda.h"
+
+namespace clang {
+namespace sema {
+class FunctionScopeInfo;
+}
+class Sema;
+
+/// Examines the FunctionScopeInfo stack to determine the nearest
+/// enclosing lambda (to the current lambda) that is 'capture-capable' for
+/// the variable referenced in the current lambda (i.e. \p VarToCapture).
+/// If successful, returns the index into Sema's FunctionScopeInfo stack
+/// of the capture-capable lambda's LambdaScopeInfo.
+/// See Implementation for more detailed comments.
+
+Optional<unsigned> getStackIndexOfNearestEnclosingCaptureCapableLambda(
+    ArrayRef<const sema::FunctionScopeInfo *> FunctionScopes,
+    VarDecl *VarToCapture, Sema &S);
+
+} // clang
+
+#endif