[llvm-bugs] [Bug 47217] New: Error propagating the tru type of an expression: "non-literal type 'auto' cannot be used in a constant expression"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47217

            Bug ID: 47217
           Summary: Error propagating the tru type of an expression:
                    "non-literal type 'auto' cannot be used in a constant
                    expression"
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: __alex8 at ukr.net
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following code

template <typename... B>
struct Sample {
    template <typename A>
    static constexpr auto bar = 0;
};

constexpr auto fail = Sample<>::template bar<int>;

Fails to compile with this error: "non-literal type 'auto' cannot be used in a
constant expression"

Looks like a bug to me (and this only happens in clang).

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