diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -2586,13 +2586,11 @@
     2, std::numeric_limits<unsigned>::max()>
     allOf;
 
-/// Matches any node regardless of the submatchers.
+/// Matches any node regardless of the submatcher.
 ///
-/// However, \c optionally will generate a result binding for each matching
-/// submatcher.
-///
-/// Useful when additional information which may or may not present about a
-/// main matching node is desired.
+/// However, \c optionally will retain any bindings generated by the submatcher.
+/// Useful when additional information which may or may not present about a main
+/// matching node is desired.
 ///
 /// For example, in:
 /// \code
@@ -2612,9 +2610,7 @@
 /// member named "bar" in that class.
 ///
 /// Usable as: Any Matcher
-extern const internal::VariadicOperatorMatcherFunc<
-    1, std::numeric_limits<unsigned>::max()>
-    optionally;
+extern const internal::VariadicOperatorMatcherFunc<1, 1> optionally;
 
 /// Matches sizeof (C99), alignof (C++11) and vec_step (OpenCL)
 ///
diff --git a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
--- a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
+++ b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
@@ -346,18 +346,11 @@
                                 ASTMatchFinder *Finder,
                                 BoundNodesTreeBuilder *Builder,
                                 ArrayRef<DynTypedMatcher> InnerMatchers) {
-  BoundNodesTreeBuilder Result;
-  bool Matched = false;
-  for (const DynTypedMatcher &InnerMatcher : InnerMatchers) {
-    BoundNodesTreeBuilder BuilderInner(*Builder);
-    if (InnerMatcher.matches(DynNode, Finder, &BuilderInner)) {
-      Matched = true;
-      Result.addMatch(BuilderInner);
-    }
-  }
-  // If there were no matches, we can't assign to `*Builder`; we'd (incorrectly)
-  // clear it because `Result` is empty.
-  if (Matched)
+  if (InnerMatchers.size() != 1)
+    return false;
+
+  BoundNodesTreeBuilder Result(*Builder);
+  if (InnerMatchers[0].matches(DynNode, Finder, &Result))
     *Builder = std::move(Result);
   return true;
 }
@@ -859,9 +852,8 @@
 const internal::VariadicOperatorMatcherFunc<
     2, std::numeric_limits<unsigned>::max()>
     allOf = {internal::DynTypedMatcher::VO_AllOf};
-const internal::VariadicOperatorMatcherFunc<
-    1, std::numeric_limits<unsigned>::max()>
-    optionally = {internal::DynTypedMatcher::VO_Optionally};
+const internal::VariadicOperatorMatcherFunc<1, 1> optionally = {
+    internal::DynTypedMatcher::VO_Optionally};
 const internal::VariadicFunction<internal::Matcher<NamedDecl>, StringRef,
                                  internal::hasAnyNameFunc>
     hasAnyName = {};
diff --git a/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
--- a/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
@@ -2007,9 +2007,8 @@
 TEST(Optionally, SubmatchersDoNotMatch) {
   EXPECT_TRUE(matchAndVerifyResultFalse(
       "class A { int a; int b; };",
-      recordDecl(optionally(has(fieldDecl(hasName("c")).bind("v")),
-                            has(fieldDecl(hasName("d")).bind("v")))),
-      std::make_unique<VerifyIdIsBoundTo<FieldDecl>>("v")));
+      recordDecl(optionally(has(fieldDecl(hasName("c")).bind("c")))),
+      std::make_unique<VerifyIdIsBoundTo<FieldDecl>>("c")));
 }
 
 // Regression test.
@@ -2028,14 +2027,8 @@
 TEST(Optionally, SubmatchersMatch) {
   EXPECT_TRUE(matchAndVerifyResultTrue(
       "class A { int a; int c; };",
-      recordDecl(optionally(has(fieldDecl(hasName("a")).bind("v")),
-                            has(fieldDecl(hasName("b")).bind("v")))),
-      std::make_unique<VerifyIdIsBoundTo<FieldDecl>>("v", 1)));
-  EXPECT_TRUE(matchAndVerifyResultTrue(
-      "class A { int c; int b; };",
-      recordDecl(optionally(has(fieldDecl(hasName("c")).bind("v")),
-                            has(fieldDecl(hasName("b")).bind("v")))),
-      std::make_unique<VerifyIdIsBoundTo<FieldDecl>>("v", 2)));
+      recordDecl(optionally(has(fieldDecl(hasName("a")).bind("v")))),
+      std::make_unique<VerifyIdIsBoundTo<FieldDecl>>("v")));
 }
 
 TEST(IsTemplateInstantiation, MatchesImplicitClassTemplateInstantiation) {