[Bug c++/102084] New: Segfault when lambda is missing return type

[loximann at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102084

            Bug ID: 102084
           Summary: Segfault when lambda is missing return type
           Product: gcc
           Version: 11.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: loximann at gmail dot com
  Target Milestone: ---

The following program crashes:

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#include <functional>
#include <iostream>
#include <tuple>

template <typename T>
std::function<T()> constant(const T& c) {
  return [c]() noexcept { return c; };
}

template <typename T>
std::function<const T&()> constant_ref(const T& c) {
  return [c]() noexcept -> const T&{ return c; };
}

template <typename T>
std::function<const T&()> constant_ref_broken(const T& c) {
  return [c]() noexcept { return c; };
}

int main() {
    std::cout << constant(1.0)() << std::endl;
    std::cout << constant_ref(1.0)() << std::endl;
    std::cout << constant_ref_broken(1.0)() << std::endl;
}
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