diff --git a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
--- a/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchersInternal.h
@@ -723,6 +723,8 @@
 
   virtual bool IsMatchingInASTNodeNotSpelledInSource() const = 0;
 
+  virtual bool IsMatchingInASTNodeNotAsIs() const = 0;
+
   bool isTraversalIgnoringImplicitNodes() const;
 
 protected:
diff --git a/clang/lib/ASTMatchers/ASTMatchFinder.cpp b/clang/lib/ASTMatchers/ASTMatchFinder.cpp
--- a/clang/lib/ASTMatchers/ASTMatchFinder.cpp
+++ b/clang/lib/ASTMatchers/ASTMatchFinder.cpp
@@ -475,6 +475,57 @@
         }
       }
       return true;
+    } else if (auto *LE = dyn_cast<LambdaExpr>(S)) {
+
+      for (unsigned I = 0, N = LE->capture_size(); I != N; ++I) {
+        const auto *C = LE->capture_begin() + I;
+        {
+          // C->isExplicit();
+          TraverseLambdaCapture(LE, C, LE->capture_init_begin()[I]);
+        }
+      }
+
+      {
+        ASTNodeNotSpelledInSourceScope RAII(this, true);
+        TraverseDecl(LE->getLambdaClass());
+      }
+      {
+        ASTNodeNotAsIsSourceScope RAII(this, true);
+
+        // We need to poke around to find the bits that might be explicitly
+        // written.
+        TypeLoc TL = LE->getCallOperator()->getTypeSourceInfo()->getTypeLoc();
+        FunctionProtoTypeLoc Proto = TL.getAsAdjusted<FunctionProtoTypeLoc>();
+
+        if (auto *TPL = LE->getTemplateParameterList()) {
+          for (NamedDecl *D : *TPL) {
+            TraverseDecl(D);
+          }
+          if (Expr *RequiresClause = TPL->getRequiresClause()) {
+            TraverseStmt(RequiresClause);
+          }
+        }
+
+        if (LE->hasExplicitParameters()) {
+          // Visit parameters.
+          for (unsigned I = 0, N = Proto.getNumParams(); I != N; ++I)
+            TraverseDecl(Proto.getParam(I));
+        }
+
+        auto *T = Proto.getTypePtr();
+        for (const auto &E : T->exceptions())
+          TraverseType(E);
+
+        if (Expr *NE = T->getNoexceptExpr())
+          TraverseStmt(NE, Queue);
+
+        if (LE->hasExplicitResultType())
+          TraverseTypeLoc(Proto.getReturnLoc());
+        TraverseStmt(LE->getTrailingRequiresClause());
+
+        TraverseStmt(LE->getBody());
+      }
+      return true;
     }
     return RecursiveASTVisitor<MatchASTVisitor>::dataTraverseNode(S, Queue);
   }
@@ -617,6 +668,9 @@
   bool IsMatchingInASTNodeNotSpelledInSource() const override {
     return TraversingASTNodeNotSpelledInSource;
   }
+  bool IsMatchingInASTNodeNotAsIs() const override {
+    return TraversingASTNodeNotAsIs;
+  }
 
   bool TraverseTemplateInstantiations(ClassTemplateDecl *D) {
     ASTNodeNotSpelledInSourceScope RAII(this, true);
@@ -638,6 +692,7 @@
 
 private:
   bool TraversingASTNodeNotSpelledInSource = false;
+  bool TraversingASTNodeNotAsIs = false;
   bool TraversingASTChildrenNotSpelledInSource = false;
 
   struct ASTNodeNotSpelledInSourceScope {
@@ -654,6 +709,18 @@
     bool MB;
   };
 
+  struct ASTNodeNotAsIsSourceScope {
+    ASTNodeNotAsIsSourceScope(MatchASTVisitor *V, bool B)
+        : MV(V), MB(V->TraversingASTNodeNotAsIs) {
+      V->TraversingASTNodeNotAsIs = B;
+    }
+    ~ASTNodeNotAsIsSourceScope() { MV->TraversingASTNodeNotAsIs = MB; }
+
+  private:
+    MatchASTVisitor *MV;
+    bool MB;
+  };
+
   struct ASTChildrenNotSpelledInSource {
     ASTChildrenNotSpelledInSource(MatchASTVisitor *V, bool B)
         : MV(V), MB(V->TraversingASTChildrenNotSpelledInSource) {
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
@@ -293,6 +293,10 @@
       Finder->IsMatchingInASTNodeNotSpelledInSource())
     return false;
 
+  if (!Finder->isTraversalIgnoringImplicitNodes() &&
+      Finder->IsMatchingInASTNodeNotAsIs())
+    return false;
+
   auto N =
       Finder->getASTContext().getParentMapContext().traverseIgnored(DynNode);
 
@@ -317,6 +321,10 @@
       Finder->IsMatchingInASTNodeNotSpelledInSource())
     return false;
 
+  if (!Finder->isTraversalIgnoringImplicitNodes() &&
+      Finder->IsMatchingInASTNodeNotAsIs())
+    return false;
+
   auto N =
       Finder->getASTContext().getParentMapContext().traverseIgnored(DynNode);
 
diff --git a/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
--- a/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
@@ -3065,6 +3065,18 @@
       traverse(TK_IgnoreUnlessSpelledInSource,
                functionDecl(hasName("func14"), hasDescendant(floatLiteral()))),
       langCxx20OrLater()));
+
+  Code = R"cpp(
+void foo() {
+    auto l = [](int i) {
+        if (i) return;
+    };
+}
+)cpp";
+
+  EXPECT_TRUE(matches(Code, traverse(TK_AsIs, ifStmt())));
+  EXPECT_TRUE(
+      matches(Code, traverse(TK_IgnoreUnlessSpelledInSource, ifStmt())));
 }
 
 TEST(IgnoringImpCasts, MatchesImpCasts) {