aaron.ballman added inline comments.

================
Comment at: clang/lib/AST/Interp/ByteCodeExprGen.cpp:2172-2173
 
+  // Lazily visit global declarations we haven't seen yet.
+  // This happens in C.
+  if (const auto *VD = dyn_cast<VarDecl>(D);
----------------
Do we want to assert/limit this functionality to C instead of doing it in both 
C and C++?


================
Comment at: clang/test/AST/Interp/c.c:15-16
+
+const int b = 3;
+_Static_assert(b == 3, "");
----------------
Pedantically, this is also not a constant expression. Probably worth adding 
`-pedantic` to the RUN lines to ensure we properly warn with both constexpr 
engines.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156794/new/

https://reviews.llvm.org/D156794

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