[llvm-bugs] [Bug 52403] New: Compile fails when using enum declaration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52403

            Bug ID: 52403
           Summary: Compile fails when using enum declaration
           Product: clang
           Version: 13.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: n.makhsudyan at yahoo.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

According to C++20 standard the following code is valid, however it doesn't
compile with clang13:

enum class Pig { Oink };
using Hog = Pig;
using enum Hog;


Output:

<source>:3:12: error: type alias 'Hog' cannot be referenced with a enum
specifier
using enum Hog;
           ^
<source>:2:7: note: declared here
using Hog = Pig;
      ^
1 error generated.
Compiler returned: 1


Obligatory godbolt link:
https://gcc.godbolt.org/z/413defY1q

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