[clang] [Clang][Sema] Reject array prvalue operands (PR #140702)

[via cfe-commits]

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@@ -7639,6 +7639,8 @@ def warn_param_mismatched_alignment : Warning<
 
 def err_objc_object_assignment : Error<
   "cannot assign to class object (%0 invalid)">;
+def err_typecheck_array_prvalue_operand : Error<
+  "array prvalue is not permitted">;
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cor3ntin wrote:

I agree with @AaronBallman and @Sirraide that using `err_typecheck_invalid_operands` is the better approach here.
The "prvalue" bit is only relevant as far as array decay is concerned (eg : array-to-pointer does not apply). 
But ultimately, `int[]` + `int`  is what we should diagnose, not how we got here.

https://github.com/llvm/llvm-project/pull/140702