[llvm-bugs] [Bug 46603] New: Clang rejects "enum struct/class" in reference to enumeration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46603

            Bug ID: 46603
           Summary: Clang rejects "enum struct/class" in reference to
                    enumeration
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: haoxintu at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Hi, all.

This code, test.cc, clang rejects it in trunk but accepts it in versions from
6.0 to 10.0.

$cat test.cc
using alias1 = enum struct E1;
using alias2 = enum class E2;

$clang++-trunk -c test.cc
test.cc:1:21: error: reference to enumeration must use 'enum' not 'enum struct'
[-Welaborated-enum-class]
using alias1 = enum struct E1;
                    ^~~~~~~
test.cc:2:21: error: reference to enumeration must use 'enum' not 'enum class'
[-Welaborated-enum-class]
using alias2 = enum class E2;
                    ^~~~~~
2 errors generated.


$clang++-10 -c test.cc
//emits nothing

My clang version is:
$clang++-trunk -v
clang version 11.0.0 (https://github.com/llvm/llvm-project
b9306fd042ce1c11d84f05d2124dfdc65b8331fe)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/haoxin/compilers/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64

I also tested this in GCC, and it accepts well. So I am wondering is this a
clang-trunk's reject-valid bug or GCC's accpet-invlaid bug?

Thanks,
Haoxin

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