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From: "stevenxia990430 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110242] New: ICE on valid (decltype with lambda)
Date: Tue, 13 Jun 2023 21:05:26 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.1.0
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X-Bugzilla-Who: stevenxia990430 at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110242

            Bug ID: 110242
           Summary: ICE on valid (decltype with lambda)
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stevenxia990430 at gmail dot com
  Target Milestone: ---

The following program reports an internal compiler error: error reporting
routines re-entered.

To quickly reproduce: https://gcc.godbolt.org/z/h4aG89rWT
```
#include <tuple>
template <typename Tuple>
auto foo(const Tuple& t) -> decltype(([](auto&&... xs){return 0;})){
}

int main(){
    const std::tuple<int> t{1};
    return foo([](){ return 0;})(t);
}
```

Note that this code when tested on clang-trunk successfully compiles.=