[clang] [Clang][Sema]: Diagnose lambda to bool implicit casts (PR #83152)

[Vlad Serebrennikov via cfe-commits]

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@@ -287,6 +287,11 @@ namespace dr1837 { // dr1837: 3.3
       };
     };
   };
+  /* since-cxx11-warning at -6{{address of function '[] {
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Endilll wrote:

Can you convert this to use a marker? We don't want readers to count relative offsets. In other words, it should read `since-cxx11-warning@#dr1837-lambda {{address of function ...`

You can see an example in the test for 1890.

https://github.com/llvm/llvm-project/pull/83152