================
@@ -1426,6 +1727,34 @@ void Sema::DeclareImplicitDeductionGuides(TemplateDecl
*Template,
if (!AddedAny)
Transform.buildSimpleDeductionGuide(std::nullopt);
+ // FIXME: Handle explicit deduction guides from inherited constructors
+ // when the base deduction guides are declared after this has first run
+ if (getLangOpts().CPlusPlus23 &&
+ Pattern->getTemplatedDecl()->hasDefinition()) {
+ unsigned BaseIdx = 0;
+ for (const auto &Base : Pattern->getTemplatedDecl()->bases()) {
+ ++BaseIdx;
+ if (!Base.getType()->isDependentType())
----------------
hokein wrote:
We will ignore the case like
```
template <typename T2> struct C : public B<int> {
using B<T2>::B;
};
```
I couldn't find any word in the standard suggesting that this case should be
filtered out, and gcc accepts it, https://godbolt.org/z/4e46Ecb1s.
https://github.com/llvm/llvm-project/pull/98788
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