[clang] Add test for CWG191

[Endill]

Summary

Also mark CWG1200 as "na."

P1787: CWG191 and CWG1200 are resolved by defining unqualified lookup in terms of every enclosing scope.
Wording: If no declarations are found, the results of the unqualified search are the results of an unqualified search in the parent scope of S, if any, from P. ([basic.lookup.unqual]/2)

[Endill]

Mark CWG1200 as "na" and enable newer standard versions in RUN lines

[shafik]

LGTM

clang/test/CXX/drs/dr12xx.cpp

 // RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
-// RUN: %clang_cc1 -std=c++1z %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++20 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++2b %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+
+// dr1200: na
 
 namespace dr1213 { // dr1213: 7
 #if __cplusplus >= 201103L
   using T = int[3];
   int &&r = T{}[1];
 
   using T = decltype((T{}));
   using U = decltype((T{}[2]));

clang/test/CXX/drs/dr1xx.cpp

 // RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 // RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
+// RUN: %clang_cc1 -std=c++2b -triple x86_64-unknown-unknown %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
 
 namespace dr100 { // dr100: yes
   template<const char (*)[4]> struct A {}; // expected-note 0-1{{declared here}}
   template<const char (&)[4]> struct B {}; // expected-note 0-1{{declared here}}
   template<const char *> struct C {}; // expected-note 0-1{{declared here}}
   template<const char &> struct D {}; // expected-note 0-1{{declared here}}
   A<&"foo"> a; // #100a
   B<"bar"> b; // #100b

 
 namespace dr188 { // dr188: yes
   char c[10];
   int check[sizeof(0, c) == 10 ? 1 : -1];
 }
 
 // dr190 FIXME: add codegen test for tbaa
 
+int dr191_j;
+namespace dr191 { // dr191: yes
+  namespace example1 {
+    struct outer {
+      static int i;
+      struct inner {
+        void f() {
+          struct local {
+            void g() {
+              i = 5;
+            }
+          };
+        }
+      };
+    };
+  }
+
+  namespace example2 {
+    struct S {
+      void f() {
+        struct local2 {
+          void g() {
+            dr191_j = 5;
+          }
+        };
+      }
+    };
+  }
+}
+
 // dr193 FIXME: add codegen test
 
 namespace dr194 { // dr194: yes
   struct A {
     A();
     void A(); // expected-error {{constructor cannot have a return type}}
   };
   struct B {

clang/www/cxx_dr_status.html

<tr id="190">
     <td>TC1</td>
     <td>Layout-compatible POD-struct types</td>
     <td class="none" align="center">Unknown</td>
   </tr>
   <tr id="191">
     <td><a href="https://wg21.link/cwg191">191</a></td>
     <td>CD6</td>
     <td>Name lookup does not handle complex nesting</td>
-    <td class="none" align="center">Unknown</td>
+    <td class="full" align="center">Yes</td>
   </tr>
   <tr id="192">
     <td><a href="https://wg21.link/cwg192">192</a></td>
     <td>NAD</td>
     <td>Name lookup in parameters</td>
     <td class="none" align="center">Unknown</td>
   </tr>
   <tr id="193">
<tr id="1199">
     <td>C++11</td>
     <td>Deleted constexpr functions</td>
     <td class="none" align="center">Unknown</td>
   </tr>
   <tr id="1200">
     <td><a href="https://wg21.link/cwg1200">1200</a></td>
     <td>CD6</td>
     <td>Lookup rules for template parameters</td>
-    <td class="none" align="center">Unknown</td>
+    <td class="na" align="center">N/A</td>
   </tr>
   <tr id="1201">
     <td><a href="https://wg21.link/cwg1201">1201</a></td>
     <td>C++11</td>
     <td>Are deleted and defaulted functions definitions?</td>
     <td class="none" align="center">Unknown</td>
   </tr>
   <tr id="1202">