================
@@ -4557,7 +4557,7 @@ static QualType mergeTypeNullabilityForRedecl(Sema &S, 
SourceLocation loc,
   auto prevNullability = prevType->getNullability();
 
   // Easy case: both have nullability.
-  if (nullability.has_value() == prevNullability.has_value()) {
+  if (bool(nullability) == bool(prevNullability)) {
----------------
erichkeane wrote:

Cast to bool here is a little bit of a subtle syntax, we should have some sort 
of function that explains what is going on.

https://github.com/llvm/llvm-project/pull/191828
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