[llvm-bugs] [Bug 52395] New: [C++20] [Module] Disallow re-export a declaration which is declared already

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=52395

            Bug ID: 52395
           Summary: [C++20] [Module] Disallow re-export a declaration
                    which is declared already
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yedeng.yd at linux.alibaba.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 https://eel.is/c++draft/module.interface#6, the example shouldn't
be compiled:

```
export module M;
struct S { int n; };
typedef S S;
export typedef S S;             // OK, does not redeclare an entity
export struct S;                // error: exported declaration follows
non-exported             // declaration
```

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