[C++17] Reject shadowing of capture by parameter in lambda

Summary:
This change rejects the shadowing of a capture by a parameter in lambdas in C++17.

```
int main() {
  int a;
  auto f = [a](int a) { return a; };
}
```

results in:

```
main.cpp:3:20: error: a lambda parameter cannot shadow an explicitly captured entity
  auto f = [a](int a) { return a; };
                   ^
main.cpp:3:13: note: variable a is explicitly captured here
  auto f = [a](int a) { return a; };
            ^
```

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: lebedev.ri, erik.pilkington, cfe-commits

Differential Revision: https://reviews.llvm.org/D53595

llvm-svn: 345308

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/www/cxx_dr_status.html b/clang/www/cxx_dr_status.html
index 44fdf8f17fe8..460978260f18 100755
--- a/clang/www/cxx_dr_status.html
+++ b/clang/www/cxx_dr_status.html
@@ -13081,7 +13081,7 @@ and <I>POD class</I></td>
     <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2211">2211</a></td>
     <td>C++17</td>
     <td>Hiding by lambda captures and parameters</td>
-    <td class="none" align="center">Unknown</td>
+    <td class="svn" align="center">SVN</td>
   </tr>
   <tr class="open" id="2212">
     <td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#2212">2212</a></td>