Revert "[clang] Fix crash when declaring invalid lambda member" (#84615)

Reverts #74110

Fails on many bots:
https://lab.llvm.org/buildbot/#/builders/5/builds/41633

clang/docs/ReleaseNotes.rst

@@ -258,9 +258,6 @@ Bug Fixes in This Version
   operator.
   Fixes (#GH83267).
 
-- Fixes an assertion failure on invalid code when trying to define member
-  functions in lambdas.
-
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -411,7 +408,7 @@ RISC-V Support
 CUDA/HIP Language Changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- PTX is no longer included by default when compiling for CUDA. Using
+- PTX is no longer included by default when compiling for CUDA. Using 
   ``--cuda-include-ptx=all`` will return the old behavior.
 
 CUDA Support

clang/lib/AST/DeclCXX.cpp

@@ -1567,9 +1567,10 @@ bool CXXRecordDecl::isGenericLambda() const {
 
 #ifndef NDEBUG
 static bool allLookupResultsAreTheSame(const DeclContext::lookup_result &R) {
-  return llvm::all_of(R, [&](NamedDecl *D) {
-    return D->isInvalidDecl() || declaresSameEntity(D, R.front());
-  });
+  for (auto *D : R)
+    if (!declaresSameEntity(D, R.front()))
+      return false;
+  return true;
 }
 #endif
 

clang/test/SemaCXX/lambda-expressions.cpp

@@ -1,4 +1,3 @@
-// RUN: %clang_cc1 -std=c++11 -Wno-unused-value -fsyntax-only -verify=expected,expected-cxx14,cxx11 -fblocks %s
 // RUN: %clang_cc1 -std=c++14 -Wno-unused-value -fsyntax-only -verify -verify=expected-cxx14 -fblocks %s
 // RUN: %clang_cc1 -std=c++17 -Wno-unused-value -verify -ast-dump -fblocks %s | FileCheck %s
 
@@ -559,8 +558,8 @@ struct B {
   int x;
   A a = [&] { int y = x; };
   A b = [&] { [&] { [&] { int y = x; }; }; };
-  A d = [&](auto param) { int y = x; }; // cxx11-error {{'auto' not allowed in lambda parameter}}
-  A e = [&](auto param) { [&] { [&](auto param2) { int y = x; }; }; }; // cxx11-error 2 {{'auto' not allowed in lambda parameter}}
+  A d = [&](auto param) { int y = x; };
+  A e = [&](auto param) { [&] { [&](auto param2) { int y = x; }; }; };
 };
 
 B<int> b;
@@ -590,7 +589,6 @@ struct S1 {
 void foo1() {
   auto s0 = S1{[name=]() {}}; // expected-error 2 {{expected expression}}
   auto s1 = S1{[name=name]() {}}; // expected-error {{use of undeclared identifier 'name'; did you mean 'name1'?}}
-                                  // cxx11-warning@-1 {{initialized lambda captures are a C++14 extension}}
 }
 }
 
@@ -606,7 +604,7 @@ namespace PR25627_dont_odr_use_local_consts {
 
 namespace ConversionOperatorDoesNotHaveDeducedReturnType {
   auto x = [](int){};
-  auto y = [](auto &v) -> void { v.n = 0; }; // cxx11-error {{'auto' not allowed in lambda parameter}} cxx11-note {{candidate function not viable}} cxx11-note {{conversion candidate}}
+  auto y = [](auto &v) -> void { v.n = 0; };
   using T = decltype(x);
   using U = decltype(y);
   using ExpectedTypeT = void (*)(int);
@@ -626,22 +624,22 @@ namespace ConversionOperatorDoesNotHaveDeducedReturnType {
     template<typename T>
       friend constexpr U::operator ExpectedTypeU<T>() const noexcept;
 #else
-    friend auto T::operator()(int) const; // cxx11-error {{'auto' return without trailing return type; deduced return types are a C++14 extension}}
+    friend auto T::operator()(int) const;
     friend T::operator ExpectedTypeT() const;
 
     template<typename T>
-      friend void U::operator()(T&) const; // cxx11-error {{friend declaration of 'operator()' does not match any declaration}}
+      friend void U::operator()(T&) const;
     // FIXME: This should not match, as above.
     template<typename T>
-      friend U::operator ExpectedTypeU<T>() const; // cxx11-error {{friend declaration of 'operator void (*)(type-parameter-0-0 &)' does not match any declaration}}
+      friend U::operator ExpectedTypeU<T>() const;
 #endif
 
   private:
     int n;
   };
 
-  // Should be OK in C++14 and later: lambda's call operator is a friend.
-  void use(X &x) { y(x); } // cxx11-error {{no matching function for call to object}}
+  // Should be OK: lambda's call operator is a friend.
+  void use(X &x) { y(x); }
 
   // This used to crash in return type deduction for the conversion opreator.
   struct A { int n; void f() { +[](decltype(n)) {}; } };