[llvm-bugs] [Bug 48250] New: ICE in explicit instantiation of generic lambda operator()

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48250

            Bug ID: 48250
           Summary: ICE in explicit instantiation of generic lambda
                    operator()
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldalessandro 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

The index sequence seemed necessary to trigger the ICE.

> #include <utility>
> 
> int main() {
>     auto inner = []<std::size_t... Is>() { return 0; };
>     auto outer = [&]<std::size_t... Is>(std::index_sequence<Is...>) {
>         return inner.template operator()<Is...>();
>     };
>     return outer(std::make_index_sequence<5>());
> }

https://godbolt.org/z/njK79P

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