[clang] [Clang] Add diagnostic when scoped enumeration requires an explicit conversion for binary operations (PR #152698)

[Erich Keane via cfe-commits]

================
@@ -13,6 +13,7 @@ enum class E { e };
 
 template<typename T> int f(T t) { return ~t; } // expected-error {{invalid argument type}}
 template<typename T, typename U> int f(T t, U u) { return t % u; } // expected-error {{invalid operands to}}
+                                                                   // expected-note at -1 {{no implicit conversion for scoped enum}}
----------------
erichkeane wrote:

Oh weird!  Github messed that up and showed it as JUST a blank line for me!  When I went full-screen it shows it (and when I go back to not fullscreen anymore!).  Sorry about that.

https://github.com/llvm/llvm-project/pull/152698