[llvm-bugs] [Bug 49720] New: SIGSEGV in recursive function template with generic lambda argument

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49720

            Bug ID: 49720
           Summary: SIGSEGV in recursive function template with generic
                    lambda argument
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: davidfromonline at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The following translation unit

```
template<typename Outer>
auto recurse(Outer outer_lambda) {
        outer_lambda(0);
        auto lambda = [](auto) {};
        recurse(lambda);
}

void start() {
        recurse([](int) {});
}
```

should hit the template instantiation depth and fail to compile. Instead, the
compiler crashes with a SIGSEGV, even with assertions enabled.

See it live: https://godbolt.org/z/6q7vbx8qb

It looks like this was introduced in clang 4.0.0

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