[llvm-bugs] [Bug 50590] New: Assertion `!A->getDeducedType().isNull() && "cannot request the size of an undeduced or dependent auto type"' failed

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50590

            Bug ID: 50590
           Summary: Assertion `!A->getDeducedType().isNull() && "cannot
                    request the size of an undeduced or dependent auto
                    type"' failed
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sguelton at redhat.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

This may be a duplicate of existing bugs, but the reproducer is super simple,
so I'm keeping track of it here

```
template <typename>
struct pack {
    template <typename T>
    // OK : constexpr static bool some_boolean_cx_value = true;  
    constexpr static auto some_boolean_cx_value = true;  
};

void usage() {
    pack<char>::some_boolean_cx_value<int>;
}
```

Interestingly, the bug got introduced between clang 8 and clang 9

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