Alternate fix to PR12248: put Sema in charge of special-casing

the diagnostic for assigning to a copied block capture.  This has
the pleasant side-effect of letting us special-case the diagnostic
for assigning to a copied lambda capture as well, without introducing
a new non-modifiable enumerator for it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152593 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/test/SemaCXX/lambda-expressions.cpp b/test/SemaCXX/lambda-expressions.cpp
index 99fc0caaf7..80ba0a1d03 100644
--- a/test/SemaCXX/lambda-expressions.cpp
+++ b/test/SemaCXX/lambda-expressions.cpp
@@ -139,3 +139,12 @@ void PR12248()
   unsigned int result = 0;
   auto l = [&]() { ++result; };
 }
+
+namespace ModifyingCapture {
+  void test() {
+    int n = 0;
+    [=] {
+      n = 1; // expected-error {{variable is not assignable (captured by copy)}}
+    };
+  }
+}