[llvm-bugs] [Bug 100897] Templated lambda invoked in compile time doesn't instantiates if declared inside templated function

[LLVM Bugs via llvm-bugs]

Issue	100897
Summary	Templated lambda invoked in compile time doesn't instantiates if declared inside templated function
Labels	new issue
Assignees
Reporter	GuzevArtem

    ```
template<typename>
[[nodiscard]]
constexpr auto foo() noexcept
{
    constexpr auto extract_size = []<typename argument_t>() constexpr -> int
    {
        return 1;
    };
 //return extract_size.template operator()<int>(); // works
    constexpr int result = extract_size.template operator()<int>(); // undefined function 'operator()<int>'
    return result;
}

int main() {
 return foo<void>();
}
```

https://godbolt.org/z/6bj4d6zef

<source>:10:19: error: constexpr variable 'result' must be initialized by a constant _expression_
<source>:10:50: note: undefined function 'operator()<int>' cannot be used in a constant _expression_

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