================
@@ -132,3 +132,30 @@ bool f();
template <typename... T>
void g(bool = (f<T>() || ...));
}
+
+
+namespace comparison_warning {
+ struct S {
+ bool operator<(const S&) const;
+ bool operator<(int) const;
+ bool operator==(const S&) const;
+ };
+
+ template <typename...T>
+ void f(T... ts) {
+ (void)(ts == ...);
+ // expected-error@-1 2{{comparison in fold expression would evaluate to
'(X == Y) == Z'}}
+ (void)(ts < ...);
+ // expected-error@-1 2{{comparison in fold expression would evaluate to
'(X < Y) < Z'}}
+ (void)(... < ts);
+ // expected-error@-1 2{{comparison in fold expression would evaluate to
'(X < Y) < Z'}}
+ }
+
+ void test() {
+ f(0, 1, 2); // expected-note{{in instantiation}}
+ f(0, 1); // expected-note{{in instantiation}}
----------------
cor3ntin wrote:
This is intended -, ideally, we would even warn when `n <= 1` (ie, the size of
the pack should not affect the warning) - but that would be annoying because
there could be user-defined operators, and we only discover that for n >=2.
https://github.com/llvm/llvm-project/pull/136836
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