cjdb added inline comments.

================
Comment at: clang/lib/Sema/SemaExprCXX.cpp:4889-4890
     return T->isArrayType();
+  case UTT_IsBoundedArray:
+    return T->isArrayType() && !T->isIncompleteArrayType();
+  case UTT_IsUnboundedArray:
----------------
aaron.ballman wrote:
> Is a VLA a bounded array? (We support those as an extension in C++, 
> unfortunately.)
`__is_bounded_array(T)` is true when "`T` is an array type of known bound". Do 
VLAs meet this criteria?


================
Comment at: clang/lib/Sema/SemaExprCXX.cpp:5289
+    if (UTT == UTT_IsCopyAssignable) {
+      return EvaluateBinaryTypeTrait(Self, BTT_IsAssignable, 
Self.BuildReferenceType(T, true, KeyLoc, T.getBaseTypeIdentifier()), 
AssigneeType, KeyLoc);
+    }
----------------
aaron.ballman wrote:
> It looks like this file could stand to be clang formatted.
Yeah, there was a time where `arc diff` did the formatting automatically, but 
it seems that day has passed :(


================
Comment at: clang/test/SemaCXX/type-traits.cpp:764
+  int t30[F(__is_bounded_array(void*))];
+  int t31[F(__is_bounded_array(cvoid*))];
+}
----------------
aaron.ballman wrote:
> Any reason there's not a test with something like `int[10]` and `int[]`? 
> (Same below.)
Those are `IntAr` and `IntArNB` at the very top. I can rename those if you'd 
like.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D116280/new/

https://reviews.llvm.org/D116280

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