[clang] [Clang] omit parentheses in fold expressions with a single expansion (PR #110761)

[Oleksandr T. via cfe-commits]

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@@ -36,7 +36,7 @@ using r1i2 = r1<char>; // expected-error {{constraints not satisfied for class t
 template<typename... Ts> requires
 false_v<requires (Ts... ts) {requires ((sizeof(ts) == 2) && ...);}>
 // expected-note at -1 {{because 'false_v<requires (short ts, unsigned short ts) { requires (sizeof (ts) == 2) && (sizeof (ts) == 2); }>'}}
-// expected-note at -2 {{because 'false_v<requires (short ts) { requires (sizeof (ts) == 2); }>' evaluated to false}}
+// expected-note at -2 {{because 'false_v<requires (short ts) { requires sizeof (ts) == 2; }>' evaluated to false}}
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a-tarasyuk wrote:

> The only thing I could come up with that this MIGHT cause an issue (which, not ruling out the Decltype above!),

I briefly looked into some new cases with `decltype`, and it seems it's unsafe to omit the `()`. I’ll take a closer look at those cases...









https://github.com/llvm/llvm-project/pull/110761