diff --git a/clang-tools-extra/clang-tidy/abseil/StringFindStartswithCheck.cpp b/clang-tools-extra/clang-tidy/abseil/StringFindStartswithCheck.cpp
--- a/clang-tools-extra/clang-tidy/abseil/StringFindStartswithCheck.cpp
+++ b/clang-tools-extra/clang-tidy/abseil/StringFindStartswithCheck.cpp
@@ -105,12 +105,9 @@
 
   // Create a preprocessor #include FixIt hint (CreateIncludeInsertion checks
   // whether this already exists).
-  auto IncludeHint = IncludeInserter->CreateIncludeInsertion(
+  Diagnostic << IncludeInserter->CreateIncludeInsertion(
       Source.getFileID(ComparisonExpr->getBeginLoc()), AbseilStringsMatchHeader,
       false);
-  if (IncludeHint) {
-    Diagnostic << *IncludeHint;
-  }
 }
 
 void StringFindStartswithCheck::registerPPCallbacks(
diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/InitVariablesCheck.cpp
@@ -96,10 +96,8 @@
                    MatchedDecl->getName().size()),
                InitializationString);
     if (AddMathInclude) {
-      auto IncludeHint = IncludeInserter->CreateIncludeInsertion(
+      Diagnostic << IncludeInserter->CreateIncludeInsertion(
           Source.getFileID(MatchedDecl->getBeginLoc()), MathHeader, false);
-      if (IncludeHint)
-        Diagnostic << *IncludeHint;
     }
   }
 }
diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProBoundsConstantArrayIndexCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProBoundsConstantArrayIndexCheck.cpp
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProBoundsConstantArrayIndexCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProBoundsConstantArrayIndexCheck.cpp
@@ -86,13 +86,10 @@
                   SourceRange(BaseRange.getEnd().getLocWithOffset(1),
                               IndexRange.getBegin().getLocWithOffset(-1)),
                   ", ")
-           << FixItHint::CreateReplacement(Matched->getEndLoc(), ")");
-
-      Optional<FixItHint> Insertion = Inserter->CreateIncludeInsertion(
-          Result.SourceManager->getMainFileID(), GslHeader,
-          /*IsAngled=*/false);
-      if (Insertion)
-        Diag << Insertion.getValue();
+           << FixItHint::CreateReplacement(Matched->getEndLoc(), ")")
+           << Inserter->CreateIncludeInsertion(
+                  Result.SourceManager->getMainFileID(), GslHeader,
+                  /*IsAngled=*/false);
     }
     return;
   }
diff --git a/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp b/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
--- a/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/MakeSmartPtrCheck.cpp
@@ -429,11 +429,9 @@
   if (MakeSmartPtrFunctionHeader.empty()) {
     return;
   }
-  if (auto IncludeFixit = Inserter->CreateIncludeInsertion(
-          FD, MakeSmartPtrFunctionHeader,
-          /*IsAngled=*/MakeSmartPtrFunctionHeader == StdMemoryHeader)) {
-    Diag << *IncludeFixit;
-  }
+  Diag << Inserter->CreateIncludeInsertion(
+      FD, MakeSmartPtrFunctionHeader,
+      /*IsAngled=*/MakeSmartPtrFunctionHeader == StdMemoryHeader);
 }
 
 } // namespace modernize
diff --git a/clang/include/clang/Basic/Diagnostic.h b/clang/include/clang/Basic/Diagnostic.h
--- a/clang/include/clang/Basic/Diagnostic.h
+++ b/clang/include/clang/Basic/Diagnostic.h
@@ -21,6 +21,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator_range.h"
@@ -1288,6 +1289,29 @@
   return DB;
 }
 
+inline const DiagnosticBuilder &
+operator<<(const DiagnosticBuilder &DB,
+           const llvm::Optional<SourceRange> &Opt) {
+  if (Opt)
+    DB << *Opt;
+  return DB;
+}
+
+inline const DiagnosticBuilder &
+operator<<(const DiagnosticBuilder &DB,
+           const llvm::Optional<CharSourceRange> &Opt) {
+  if (Opt)
+    DB << *Opt;
+  return DB;
+}
+
+inline const DiagnosticBuilder &
+operator<<(const DiagnosticBuilder &DB, const llvm::Optional<FixItHint> &Opt) {
+  if (Opt)
+    DB << *Opt;
+  return DB;
+}
+
 /// A nullability kind paired with a bit indicating whether it used a
 /// context-sensitive keyword.
 using DiagNullabilityKind = std::pair<NullabilityKind, bool>;