clang crash due to missing typename for dependent type #174301
Description
The following minimized reproducer produces a clang frontend crash:
template <class T>
struct Tester {
struct Inner {
using T2 = int;
};
static void test();
};
template <class T>
/*typename*/ Tester<T>::Inner::T2 getInnerT2() { return {}; }
template <class T>
void Tester<T>::test() {
auto _ = getInnerT2<T>();
}
template struct Tester<int>;https://compiler-explorer.com/z/jnqf8fP68
Assertion:
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ASTContext.cpp:2428:
clang::TypeInfo clang::ASTContext::getTypeInfoImpl(const clang::Type*) const:
Assertion `!A->getDeducedType().isNull() && "cannot request the size of an undeduced or dependent auto type"' failed.
Note that this only crashes when omitting the typename from getInnerT2(). With explicit typename, the code compiles.