[llvm-bugs] [Bug 41455] New: clang crashes on c++17 class template deduction argument types of function pointers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41455

            Bug ID: 41455
           Summary: clang crashes on c++17 class template deduction
                    argument types of function pointers
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++'17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: baruchs at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Any attempt to deduce the arguments of a function pointer with C++17 class
template deduction results in clang crashing. 

The same code works on clang 6.0.0, but no longer works on clang 7.0.0, 8.0.0,
and current trunk.

The following complier explorer link reproduces the crash
https://godbolt.org/z/SKT-Fh

----- .cpp file -------

template<typename... arg_types>
struct wrapper
{
    wrapper(void (*f)(arg_types...));
};

void f(int a);

void g()
{
    auto w = wrapper(f);
}

-----------------------

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