Adding _Nonnull attribute causes template deduction to fail

[ilya-biryukov]

https://gcc.godbolt.org/z/MW94Ezd11

template <class T> struct Base {};
template <class T> struct Derived : Base<T> {};

template <class T> void foo(Base<T> *_Nonnull);

template <class T> void bar(Base<T> *);


void test() {
    Derived<int> d;
    foo(&d); // fails.
    bar(&d); // okay.
}

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Ilya Biryukov (ilya-biryukov)

https://gcc.godbolt.org/z/MW94Ezd11

template <class T> struct Base {};
template <class T> struct Derived : Base<T> {};

template <class T> void foo(Base<T> *_Nonnull);

template <class T> void bar(Base<T> *);


void test() {
    Derived<int> d;
    foo(&d); // fails.
    bar(&d); // okay.
}